CN103521755A - Micro-nano silicide particulate reinforced laser cladding alloy powder and preparing method thereof - Google Patents
Micro-nano silicide particulate reinforced laser cladding alloy powder and preparing method thereof Download PDFInfo
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Abstract
The invention discloses micro-nano silicide particulate reinforced laser cladding alloy powder and a preparing method thereof. The micro-nano silicide particulate reinforced laser cladding alloy powder and the preparing method thereof are characterized in that the micro-nano silicide particulate reinforced laser cladding alloy powder is composed of matrix alloy powder, micro-nano silicide particles and binders. The alloy powder is prepared, by ratio, by 50-98% of matrix alloy powder, 1-45% of micro-nano SiC or micro-nano combined mixture powder of one or more of micro-nano Si3N4, micro-nano MoSi2 and micro-nano CoSi2. The preparing technological steps of the alloy powder include preparing the matrix alloy powder, adding the micro-nano silicide particles, adding the binders, stirring and ball grinding, combining the powder, drying, crushing and screening. The alloy powder for laser cladding is high in hardness and toughness, good in wear resistance and corrosion resistance, particularly suitable for laser cladding of working condition parts with high impact and high wear resistance and capable of effectively avoiding segregation caused by large specific gravity differences among all components in the storing, transporting and using process.
Description
Technical field
The invention belongs to nickel-base alloy technical field, relate to a kind of micro-nano cladding alloy powder and preparation method thereof, particularly a kind of micro-nano silicide particle strengthens cladding alloy powder and preparation method thereof, and this micro-nano silicide particle strengthens cladding alloy powder and is applicable to laser melting coating high abrasion operating mode parts.
Background technology
In modern daily life and industrial production, the attrition and attack of metal material there will be in every field, one of two large major ways that destroy component of machine, engineering component, corrosion will cause a large amount of consumption of machine components, and wearing and tearing are to cause one of major reason of machine components inefficacy.They,, in a large amount of metal materials of loss, have also wasted ample resources, occupy very large proportion in economic loss.
The inefficacy of the engineering component that high temperature, burn into friction and wear cause occurs in surface mostly, and this phenomenon is impelled the very big concern of material science worker to material surface, and impels the fast development of material surface modifying technology.People wish when material monolithic keeps enough toughness and intensity, make material surface obtain higher, specific serviceability, as wear-resisting, anti-corrosion and anti-oxidant etc.
It is reported, at present, in ， whole world industrialized country, the energy consuming in wearing and tearing accounts for 1/2nd of gross energy, approximately has 60%～80% component of machine because wearing and tearing were lost efficacy.A highly developed industrialized country, the economic loss causing because of wearing and tearing every year almost accounts for 1%～2% of total value of production in national economy.For example, the economic loss that the U.S. causes due to wearing and tearing is every year on average up to 20,000,000,000 dollars; The economic loss that Britain is caused by wearing and tearing is every year on average over 51,500 ten thousand pounds.In China, the economic loss being caused by wearing and tearing is equally also quite serious.Only according to department's rough Statistics such as oil, chemical industry, coal, electric power, agricultural machinery, just there is steel consumption up to millions of tons in China every year in wearing and tearing, and economic loss reaches 200～30,000,000,000 yuan more than.Thus, the effect of attrition of metal material performance quality and the service life of machine components, and then affects the competitiveness of these machine components on market.
Meanwhile, metal erosion problem also spreads all over national economy every field, from the industrial and agricultural production that is applied to of most advanced branches of science technology, and the manufacture that is applied to national defense industry from daily life, the place of every use metal material, all exists etching problem in varying degrees.According to relevant expert's statistics, each minute half in the whole world just has one ton of steel to be etched into iron rust.For example, the economic loss that the 1975 Nian， U.S. are caused by corrosion every year, up to 82,000,000,000 dollars, accounts for 4.9% of total value of production in national economy; Nineteen ninety-five, the economic loss straight line that the U.S. causes due to corrosion rises to 3,000 hundred million dollars.Statistics shows, in a country that industry is flourishing, because corroding the economic loss causing, accounts for 2%～4% of total value of production in national economy, the summation of the loss causing over all natural calamities such as floods, fire, earthquake and ancient measure of length, equal to 8 cun wind.Although China Jin Weiyige developing country, because the loss that corrosion brings is also considerable, annual about 5,000 hundred million yuans, accounts for 6% left and right of Chinese national economy total output value.The economic loss only being caused by corrosion every year in oil and gas field is with regard to approximately 10,000,000,000 yuan, and the fund waste that coal industry is caused by corrosion is every year about 55.6 hundred million yuan, nearly 1,700,000,000 yuan of the annual corrosion loss of power system.
Therefore, from limited natural resources and energy resources, modern demand of industrial production component of machine has enough wear and corrosion behaviors, can extremely under rugged environment, work long hours at high temperature, high load capacity etc., and the attrition and attack problem that therefore solves metal is extremely urgent.
Laser melting coating ceramic technology can combine the high obdurability of metal, good manufacturability and wear-resisting, anti-corrosion, the high temperature resistant and anti-oxidation characteristics of ceramic material excellence, for the surface strengthening technology of most worthy and competitiveness, it is also one of focus of laser melting and coating technique development.
Laser melting coating is the technology of emerging a, fast development, it is under high-energy-density laser beam irradiation, matrix surface skim melts with the alloy adding as required simultaneously, forming thickness is 10～1000 μ m surface melting layers, the process that rapid solidification requires to meet a certain property, be a new technology of the multidisciplinary intersection such as material reciprocation and rapid solidification moulding in set laser heat fused, molten bath, this technology obtains more careful research aspect surface treatment.
Because local surfaces is subject to heat density large, spot diameter is little, and heated time is short, therefore fusion zone is very little on surface of the work, passes to inside workpiece heat few, has very large thermograde in fusion zone, and cooling velocity can reach 10
4～10
9℃/s.Just because of rapid solidification, give the feature that alloy is different from normal freezing.As the laser melting coating of one of surface modification means, be suitable for top layer modification and the reparation of each metalloid.Cladding laser surfaces can keep former coating alloy composition (dilution rate 5～8%), only at the intersection of reflow zone and matrix, exists very limited ，Er Ci diffusion region, phase diffusion zone to realize just the metallurgical binding of coat and matrix necessary.It is upper that it can be coated in common material (workpiece) high performance alloy powder, thereby obtain the face coat (as good coatings such as heat-resisting, anti-corrosion, wear-resisting, shock resistances) of excellent specific property.
Compare with traditional surface modification (thermal spraying, plasma spraying etc.) technology, it mainly contains following advantage: interface is metallurgical binding; Organize superfine; Cladding layer composition is even and dilution factor is low; Coating thickness is controlled; Heat distortion is little; Easily realize constituency cladding and technical process and easily realize automation.In process for modifying surface, laser melting coating has become more active research field.
Laser surface coating technology is one of the advanced subject in the material surface engineering field that grows up of middle nineteen seventies, both at home and abroad just flourish.Along with the development and perfection of superpower laser and supporting technology, it progressively moves towards commercial Application from laboratory research, in following material surface modifying field, will have powerful vitality.Laser melting coating both can be used for the surface modification of traditional material, promoted the performance of material, can be used for again the reparation of surface failure part, therefore available matrix material is very extensive, as carbon steel, steel alloy, cast iron and aluminium alloy, copper alloy, nickel base superalloy etc.In addition, material scientific research personnel has also developed amorphous state and quasi crystal coating etc.At present, more at the study on the modification on traditional material surface to laser technology both at home and abroad, the research of high-alloy steel, high-temperature alloy surface modification also has report, yet application laser melting coating is repaired the practical engineering application of some components of machine and is but awaited further popularization, main cause is in laser cladding process, often to have the problems such as crackle, coating be inhomogeneous, awaits the further research of scientific worker.
That the state of laser melting coating layer material generally has is Powdered, thread, paste etc.In addition also can be using sheet metal, sintered metal product, steel band and welding rod etc. as cladding material, wherein alloy powder is most widely used in laser melting and coating technique.
Practical service environment condition depending on workpiece is different, also different to the performance requirement of surface coating.Cladding alloy system mainly contains ferrous alloy, nickel-base alloy, cobalt-base alloy and complex alloy powder etc.It is local wear-resisting and hold yielding part that iron(-)base powder is suitable for requirement; Nickel-base alloy is suitable for that requirement part is wear-resisting, the member of heat and corrosion resistant and thermal fatigue resistance, and required laser power density is slightly higher than cladding ferrous alloy; Cobalt-base alloy coating is suitable for the part of wear-resisting, the anti-corrosion and thermal fatigue resistance of requirement; Ceramic coating at high temperature has higher intensity, and Heat stability is good, and chemical stability is high, is applicable to the part of wear-resisting, anti-corrosion, high temperature resistant and non-oxidizability.
Wear-resistant coating is in laser melting coating ceramic coating, to study to such an extent that be also maximum a kind the earliest.Although Ni base, Co base, Fe base self-fluxing alloy itself just have good wear-resisting, anti-corrosion, heat resistance, utilize their laser cladding layer to carry out the research report of material surface strengthening a lot.But under the serious condition of slip, impact wear and abrasive wear, simple Ni base, Co base, the not competent instructions for use of Fe base self-melting alloy.
Nano material and nanometer technology are new material and the new and high technologies that 20 th century later occur.Metal-base nanometer composite material be by nano level metal or nonmetal particle equably disperse in metal and alloy substrate, form, show the mechanics, calorifics, electricity, magnetics and the optical property that are different from general macrocomposite, there is property and function that stock blend does not possess, than traditional metal material, its specific strength, specific modulus, wearability, conduction, heat conductivility etc. all have significantly and significantly improve.
Yet because the surface of nano particle can be large, surface-active is high, so single nanoparticle is extremely unstable, there is strong absorption particle and reach stable trend around, thereby cause the generation of agglomeration between particle.And the aggregate that forms of nano particle hard agglomeration often, thereby the specific surface of material is reduced, and the excellent specific property of nano particle is almost completely lost, and practical application effect is very poor.And the preparation cost of nano particle and height.
But, with respect to nano particle, micro particles be no matter surface can, surface-active, or intergranular attraction is all less, a little less than.Therefore, compare with the situation that is easy to form hard aggregation between nano particle, the reunion degree of micro particles is just less, and formed aggregate is soft-agglomerated form mostly, this soft-agglomerated be can be scattered by common mechanicals efforts or other less strength.Micron-nano composites is except the small-size effect, surface and interface effect, quantum size effect and the macro quanta tunnel effect that have single nano material and have, also there is compound collaborative several functions: can change single particle surface nature, increase the contact area of two or more components; Can prevent particle agglomeration, the physicochemical properties such as the dispersiveness of raising nano particle, free-running property, catalytic effect.Possess the more not available excellent properties of common composite.
Nano/micron complex technique is a new technique of field of nanometer material technology.Utilize this technology can obtain nano particle without reuniting, nano functional characteristic is not fully exerted, nano particle disperses good nano composite material in system.And for nano composite material, greatly reduce the preparation cost of composite.
Adopt micron particles to replace pure nano particle to strengthen and modification metal material, because had cost is low, granule preparing process is simple, and the function admirable of prepared reinforced composite, is the new development trend of metal-base composites preparing technical field.
Composite is a kind of novel surface peening engineering material, metal and metal, metal and pottery, pottery and pottery etc., and the range of choice of the collocation between alloy powder and between alloy powder and pottery is very extensive.Recent domestic has been carried out various dystectic carbide, nitride, boride and the ceramic oxide particle that adds certain content in the alloy powder system of above-mentioned laser melting coating for this reason, make the even pure ceramic coating of cermet composite coating, to improve the wearability of cladding layer.
Although adopt composite to carry out laser melting coating, can prepare high performance composite coating, but at present domestic most still research in laboratory, and its preparation technology adopts nickel-based self-fluxing alloy to mix with the WC powder of certain content in laboratory, then add saturated turpentine oil or homemade organic binder bond, furnishing slip or paste, precoating is overlying on workpiece, then carries out laser melting coating or sintering.Its hard particles adding is large, density is different from parent metal, and the distribution of particle in cladding layer is often inhomogeneous, conventionally presents gradient and distributes; The wetability of added granular materials and matrix, stability, the coefficient of expansion and chemical reactivity etc. all cause the inhomogeneities of the microstructure and property of cladding layer.And prepared combination powder is because each constituent element proportion differs greatly, thereby in storage, transportation and use procedure and easily produce segregation.Cannot carry out commercialization supply, on market, there is not yet at present micro-nano granules and strengthen the merchandise sales of laser melting coating special powder.For above-mentioned reasons, there is not yet so far laser melting coating special combination powder, thereby restricted the application of laser melting coating on high abrasion operating mode field.
Summary of the invention
The object of the invention is to avoid above-mentioned deficiency of the prior art, develop and a kind ofly can meet required a kind of micro-nano silicide particle under the serious abrasive wear working condition of engineering machinery and strengthen cladding alloy powder and preparation method thereof.
For achieving the above object, the design that the present invention can be by following basic chemical composition and add micro-nano silicide particle and corresponding technology of preparing scheme realizes:
A kind of micro-nano silicide particle provided by the present invention strengthens cladding alloy powder and is comprised of matrix alloy powder and micro-nano silicide particle and binding agent, its proportioning is: 50～98% matrix alloy powder, 1～45% micro-nano SiC or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2the micro-nano combined hybrid body powder that one of them or two kinds are above, 1～5% binding agent is prepared into combination powder; Wherein the nano-particle content in micro-nano granules is 20～30%; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.3～0.6%C, 2.0～3.5%Si, 2～4%B, 18～28%Cr, 8～11%Cu, 6～8%W, 5～8%Mo,<15%Fe, 0.1～1.2%MgO, 0.2～2%CaF<sub TranNum="102">2</sub>, CeO<sub TranNum="103">2</sub>, Y<sub TranNum="104">3</sub>o<sub TranNum="105">2</sub>, La<sub TranNum="106">2</sub>o<sub TranNum="107">3</sub>above combination≤0.9% of one of them or two kinds, Ni surplus and inevitably impurity elements;
Micro-nano silicide particle provided by the present invention strengthens cladding alloy powder and preparation method thereof, and its step of preparation process is:
Micro-nano silicide particle → interpolation binding agent → stirring ball-milling → combination the powder of matrix alloy powder preparation → add → dry → broken → screening; Concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure nickel, graphite powder, FeCr, FeB, FeSi, Cu, W, Mo, CeO
2, Y
3o
2, La
2o
3;
Melting: the above-mentioned raw material preparing is carried out to melting in vaccum sensitive stove or intermediate frequency furnace, and fusion temperature is about 1250 ℃-1350 ℃, controls carbon content and reaches requirement, after stokehold adjusting component is qualified, and 1200～1280 ℃ of tapping temperatures;
Atomization: adopt indifferent gas or hydraulic atomized, atomization aperture 5～10mm, atomizing pressure, 10～14MPa;
Dry: device therefor is coated infrared drier, and bake out temperature is 220 ℃～280 ℃;
Screening: sift out particle size range for+150 orders～-350 object powder is as finished powder by sieving machine;
(2) add micro-nano silicide particle
Choose particle size range for the commercially available micro-nano SiC of+150 orders～-400 object or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2one of them or two kinds of above micro-nano combined hybrid body powder are as strengthening hard particles;
(3) add binding agent
Adopt phenolic resins, epoxy resin or the waterglass of heat curing-type to make binding agent, add cyclohexanone or methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
By the matrix alloy powder preparing and micro-nano SiC or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2after the micro-nano combined hybrid body powder that one of them or two kinds are above and binding agent are configured according to required ratio, pour in agitating ball mill, in cyclohexanone or methanol solvate, make it be dissolved into resin solution the resin dissolves of required dosage; After stirring, pour in the mixed powder of required processing in ball mill, after being prepared according to 2:1～3:1 ratio of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, starting agitating ball mill, abundant stirring ball-milling through 5～60 hours, each component of mixed powder and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into micro-nano combination powder;
(5) dry
The combination powder that ball milling is good is poured out from ball mill, then dry through 150 ℃～200 ℃;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine, sift out particle size range for+150 orders～-400 object powder is respectively as finished powder, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
Beneficial effect
Compared with prior art, tool of the present invention has the following advantages:
1) micro-nano silicide particle of the present invention strengthens the existing higher toughness of laser melting coating high wear-resistant nickel base alloy powder, high hardness, have again excellent wearability and corrosion resistance, its abrasive wear resistance can be 10 times of rich chromium cast iron, and its corrosion resistance and 1Cr18Ni9Ti are suitable.Be applicable to laser melting coating HI high impact, high abrasion operating mode parts.
2) the micro-nano silicide particle enhancing of the present invention laser melting coating high wear-resistant nickel base alloy powder has excellent laser melting and coating process performance, and the laser cladding layer after processing has the advantages such as flawless, pore-free, free from admixture, dense structure, grain refinement.
3) the micro-nano silicide particle of preparing through technique of the present invention strengthens laser melting coating high wear-resistant nickel base alloy powder and each constituent element powder particle can be wrapped up, and is bonded together; There is enough adhesion strengths, can effectively prevent that composition powder from producing segregation because each constituent element proportion differs greatly in storage, transportation and use procedure.
4) the micro-nano silicide particle of the present invention strengthens laser melting coating high wear-resistant nickel base alloy powder, be specially adapted to the laser melting coating reparation of the alloy workpiece of high surfaces hardness, toughness and high-wearing feature, gained cladding alloy powder technology performance is good, under the condition without preheating and subsequent heat treatment, can obtain the flawless Laser Clad Alloy Coatings of the large thickness of large area, cladding layer intensity, hardness and wearability are high, plasticity and toughness are good, and significantly reduce with alloy powder cost than existing most of used for hot spraying self-fluxing alloy powders and existing most of laser melting coating.Can reduce the consumption of strategic rare element, significantly reduce laser melting coating cost.
The specific embodiment
Below in conjunction with the specific embodiment, the invention will be further described.
Embodiment mono-
A kind of micro-nano silicide particle strengthens cladding alloy powder and preparation method thereof, this micro-nano silicide particle strengthens cladding alloy powder and is comprised of matrix alloy powder and micro nanometer silicon compound hard particles and binding agent, its proportioning is: 60% matrix alloy powder, 37% micro-nano SiC, 3% phenolic resin adhesive is prepared into combination powder, and 3% phenolic resin adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.5%C, 2.0%Si, 2.5%B, 20%Cr, 9%Cu, 6%W, 6%Mo, 13%Fe, 0.1%MgO, 0.5%CaF
2, 0.2%CeO
2, 0.2%Y
3o
2, O.2%La
2o
3, Ni surplus.
Its manufacturing technology steps:
Micro-nano silicide particle → interpolation binding agent → stirring ball-milling → combination the powder of matrix alloy powder preparation → add → dry → broken → screening; Concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure nickel, graphite powder, FeCr, FeB, FeSi, Cu, W, Mo, CaF
2, CeO
2, Y
3o
2, La
2o
3; By above-mentioned percentage by weight proportioning, be ready to make the raw material of parent metal powder.
Melting: start vacuum induction intermediate frequency furnace, by the requirement of smelting technology, put into metal and start melting, the metal of general easy oxidation was put in the later stage of fusing.Fusion temperature is approximately controlled at 1250-1300 ℃; After the metal of this stove all melts in stove, carry out slag making, remove the impurity in molten metal, then enter refining period and carry out refining, before cast, add deoxidier to carry out deoxidation, control carbon content and reach requirement, after stokehold adjusting component is qualified, tapping temperature is controlled at 1200～1250 ℃.
Atomization: the qualified alloy liquid of melting is poured in cone bottom pour ladle, start to carry out the atomization of metal dust, open high-pressure inert gas, using the gases at high pressure from gas cylinder as air knife, after the constraint of leting slip a remark that is 5～10mm by aperture to fusing, become the molten metal bath stream of a thread to cut atomization, atomizing pressure 10～14MPa, by the small molten drop of metal atomization poling, final set becomes alloy powder.Metal dust after solidifying, still quite easily oxidation when high temperature, so must allow its cool to room temperature under the environment of anaerobic or hypoxemia, could reduce the oxygen content of powder.Normal nebulisation time is about 5～20 minutes.
Dry: device therefor is coated infrared drier, approximately 250 ℃ of bake out temperatures, dried metal dust, the chemical examination of chemical analysis is carried out in first sampling, proceeds to next procedure after qualified.
Screening: sift out particle size range for+150 orders～-350 object powder is as finished powder by sieving machine.
(2) add micro-nano silicide particle
Choose particle size range for the commercially available micro-nano SiC powder of-250 object is as strengthening particle;
(3) add binding agent
Adopt the phenolic resins of heat curing-type to make binding agent, add cyclohexanone solvent, make it be dissolved into resin solution;
(4) stirring ball-milling
After the matrix alloy powder preparing and micro-nano SiC powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, the phenolic resins of 3% heat curing-type is dissolved in cyclohexanone solvent and makes it be dissolved into resin solution, after stirring, pour in the mixed powder of the required processing in ball mill, after being prepared according to 2:1 ratio of grinding media to material, the abrading-ball of sphere diameter 15mm joins in agitating ball mill, abundant stirring ball-milling through 35 hours, each component of mixed powder and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, prepare micro-nano one-tenth combination powder,
(5) dry
The combination powder that ball milling is good is poured out from ball mill, then dry through 180 ℃;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine, sift out particle size range for+150 orders～-400 object powder is as finished powder, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
Requirement by user is sieved, packing warehouse-in.
Embodiment bis-
A kind of micro-nano silicide particle strengthens cladding alloy powder and preparation method thereof, this micro-nano silicide particle strengthens cladding alloy powder and is comprised of matrix alloy powder and micro nanometer silicon compound hard particles and binding agent, its proportioning is: 68% matrix alloy powder, 30% micro-nano Si
3n
4, 2% epoxy adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.6%C, 3%Si, 3%B, 25%Cr, 10Cu%, 4%W, 8%Mo, 15%Fe, 0.15%MgO, 0.9%CaF
2, 0.25%CeO
2, 0.25%Y
3o
2, 0.25%La
2o
3, Ni surplus.
(2) add micro-nano silicide particle
Choose particle size range for the commercially available Si of-400 object
3n
4powder is as strengthening hard particles; Wherein the nano-particle content in micro-nano granules is 20～30%;
(3) add binding agent
Adopt the epoxy resin of heat curing-type to make binding agent, add methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
By the matrix alloy powder preparing and micro-nano Si
3n
4after powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, the phenolic resins of 2% heat curing-type is dissolved in methanol solvate and makes it be dissolved into resin solution, after stirring, pour in the mixed powder of the required processing in ball mill, after being prepared according to 2.5:1 ratio of grinding media to material, the abrading-ball of sphere diameter 12mm joins in agitating ball mill, abundant stirring ball-milling through 5～60 hours, abundant stirring ball-milling through 26 hours, each component of mixed powder and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into micro-nano combination powder,
Its preparation method is identical with embodiment mono-.
Embodiment tri-
A kind of micro-nano silicide particle strengthens cladding alloy powder and preparation method thereof, this micro-nano silicide particle strengthens laser melting coating high wear-resistant nickel base alloy powder and is comprised of matrix alloy powder and micro nanometer silicon compound hard particles and binding agent, its proportioning is: 68% matrix alloy powder, 30% micro-nano MoSi
2powder, 2% epoxy adhesive is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.6%C, 2.5%Si, 2.0%B, 27%Cr, 8%Cu, 5%W, 5%Mo, 10%Fe, 0.2%MgO, 1.5%CaF
2, 0.3%CeO
2, 0.3%Y
3o
2, 0.3%La
2o
3, Ni surplus.
(2) add silicide particle
Choose particle size range for the commercially available micro-nano MoSi of-200 object
2powder is as strengthening particle; Wherein the nano-particle content in micro-nano granules is 20～30%;
(3) add binding agent
Adopt waterglass to make binding agent, add methanol solvate;
(4) stirring ball-milling
By the matrix alloy powder preparing and micro-nano MoSi
2after powder and binding agent are configured according to above-mentioned ratio, pour in agitating ball mill, 2.5% waterglass is incorporated in methanol solvate, after stirring, pour in the mixed powder of the required processing in ball mill, after being prepared according to 2.8:1 ratio of grinding media to material, the abrading-ball of sphere diameter 18mm joins in agitating ball mill, starting agitating ball mill, abundant stirring ball-milling through 18 hours, each component of mixed powder and waterglass liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into micro-nano combination powder;
Its preparation method is identical with embodiment mono-.
The micro-nano silicide particle of the above composition that the present invention proposes strengthens laser deposited nickel-base alloy powder end, be specially adapted to the laser melting coating on corresponding product surface, the hardness of its cladding layer is high, wearability is good, the tendency that produces cracking and other overlay defect is little, can prepare large thickness cladding layer, and laser melting and coating process is functional, than now, use the cost of cladding alloy powder low, can be suitable for application widely needs.Material of the present invention is applied has significant economic and social benefit.
Claims (1)
1. a micro-nano silicide particle strengthens cladding alloy powder and preparation method thereof, it is characterized in that: micro-nano silicide particle strengthens cladding alloy powder and is comprised of matrix alloy powder and micro-nano silicide particle and binding agent, its proportioning is: 50～98% matrix alloy powder, 1～45% micro-nano SiC or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2the micro-nano combined hybrid body powder that one of them or two kinds are above, 1～5% binding agent is prepared into combination powder; Wherein the chemical composition of matrix alloy and mass percent thereof are;
0.3～0.6%C, 2.0～3.5%Si, 2～4%B, 18～28%Cr, 8～11%Cu, 6～8%W, 5～8%Mo,<15%Fe, 0.1～1.2%MgO, 0.2～2%CaF<sub TranNum="233">2</sub>, CeO<sub TranNum="234">2</sub>, Y<sub TranNum="235">3</sub>o<sub TranNum="236">2</sub>, La<sub TranNum="237">2</sub>o<sub TranNum="238">3</sub>above combination≤0.9% of one of them or two kinds, Ni surplus and inevitably impurity elements; Its step of preparation process is:
Micro-nano silicide particle → interpolation binding agent → stirring ball-milling → combination the powder of matrix alloy powder preparation → add → dry → broken → screening; Concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → dry → screening;
Batching: raw material is pure nickel, graphite powder, FeCr, FeB, FeSi, Cu, W, Mo, CeO
2, Y
3o
2, La
2o
3;
Melting: the above-mentioned raw material preparing is carried out to melting in vaccum sensitive stove or intermediate frequency furnace, and fusion temperature is about 1250 ℃-1350 ℃, controls carbon content and reaches requirement, after stokehold adjusting component is qualified, and 1200～1280 ℃ of tapping temperatures;
Atomization: adopt indifferent gas or hydraulic atomized, atomization aperture 5～10mm, atomizing pressure, 10～14MPa;
Dry: device therefor is coated infrared drier, and bake out temperature is 220 ℃～280 ℃;
Screening: sift out particle size range for+150 orders～-350 object powder is as finished powder by sieving machine;
(2) add micro-nano silicide particle
Choose particle size range for the commercially available micro-nano SiC of+150 orders～-400 object or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2one of them or two kinds of above micro-nano combined hybrid body powder are as strengthening hard particles;
(3) add binding agent
Adopt phenolic resins, epoxy resin or the waterglass of heat curing-type to make binding agent, add cyclohexanone or methanol solvate, make it be dissolved into resin solution;
(4) stirring ball-milling
By the matrix alloy powder preparing and micro-nano SiC or micro-nano Si
3n
4, micro-nano MoSi
2, micro-nano CoSi
2after the micro-nano combined hybrid body powder that one of them or two kinds are above and binding agent are configured according to required ratio, pour in agitating ball mill, in cyclohexanone or methanol solvate, make it be dissolved into resin solution the resin dissolves of required dosage; After stirring, pour in the mixed powder of required processing in ball mill, after being prepared according to 2:1～3:1 ratio of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, starting agitating ball mill, abundant stirring ball-milling through 5～60 hours, each component of mixed powder and resin liquid are all evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into micro-nano combination powder;
(5) dry
The combination powder that ball milling is good is poured out from ball mill, then dry through 150 ℃～200 ℃;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine, sift out particle size range for+150 orders～-400 object powder is respectively as finished powder, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
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Application publication date: 20140122 |