CN103170619A - Silicide particle enhanced laser-cladding alloy powder and preparation method thereof - Google Patents
Silicide particle enhanced laser-cladding alloy powder and preparation method thereof Download PDFInfo
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- CN103170619A CN103170619A CN2013101314533A CN201310131453A CN103170619A CN 103170619 A CN103170619 A CN 103170619A CN 2013101314533 A CN2013101314533 A CN 2013101314533A CN 201310131453 A CN201310131453 A CN 201310131453A CN 103170619 A CN103170619 A CN 103170619A
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Abstract
The invention discloses silicide particle enhanced laser-cladding alloy powder and a preparation method thereof. The silicide particle enhanced laser-cladding alloy powder is characterized by consisting of base body alloy powder and silicide particles and a binder, wherein the base body alloy powder accounts for 50-98%, and SiC or one or more of the combined mixture powder of Si3N4, MoSi2 and CoSi2 accounts for 1-45%. The preparation method comprises the following steps of: preparation of the base body alloy powder, addition of the silicide particles, addition of the binder, stirring and ball milling, combination of the powder, drying, crushing and screening. The laser-cladding alloy powder disclosed by the invention has high hardness and toughness and excellent wear resistance and corrosion resistance, and is particularly suitable for the high-impact and highly wear-resistant parts in laser cladding; and moreover, the segregation caused by difference in specific gravity between the components in the storage, transportation and using processes can be effectively prevented.
Description
Technical field
The invention belongs to the nickel-base alloy technical field, relate to a kind of cladding alloy powder and preparation method thereof, particularly a kind of silicide particle strengthens cladding alloy powder and preparation method thereof, and this silicide particle strengthens the 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 one of major reasons that causes machine components to lose efficacy.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 consumed in wearing and tearing accounts for 1/2nd of gross energy, 60%～80% component of machine is approximately arranged because wearing and tearing were lost efficacy.A highly developed industrialized country, the annual economic loss caused because of wearing and tearing 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 every year on average is up to 20,000,000,000 dollars; The economic loss that Britain is caused by wearing and tearing every year on average is over 51,500 ten thousand pounds.In China, the economic loss 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 every year in China 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.
Simultaneously, the metal erosion problem also spreads all over the 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 exist 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, 1975, the economic loss that the U.S. is caused by corrosion every year, up to 82,000,000,000 dollars, accounted 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, the economic loss caused because of corrosion accounts for 2%～4% of total value of production in national economy, surpasses the summation of the loss that all natural calamities such as floods, fire, earthquake and ancient measure of length, equal to 8 cun wind cause.Although China is only a developing country, because the loss that corrosion brings is also considerable, annual about 5,000 hundred million yuans, account for 6% left and right of Chinese national economy total output value.The economic loss only caused by corrosion every year in the 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 every year is about 55.6 hundred million yuan, nearly 1,700,000,000 yuan of the corrosion loss in power system every year.
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.
Wear-resisting, anti-corrosion, the high temperature resistant and anti-oxidation characteristics of the obdurability that the laser melting coating ceramic technology can be high by metal, good manufacturability and ceramic material excellence combines, 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 the high-energy-density laser beam irradiation, the matrix surface skim melts with the alloy added 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 on surface of the work, fusion zone is very little, passes to the 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 characteristics 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 reflow zone and the intersection of matrix, have very limited phase diffusion zone, and this diffusion region realizes that the metallurgical binding of coat and matrix is necessary just.It is upper that it can be coated in common material (workpiece) to 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.
With traditional surface modification (thermal spraying, plasma spraying etc.) technology, compare, it mainly contains following advantage: interface is metallurgical binding; Organize superfine; It is low that the cladding layer composition evenly reaches dilution factor; Coating thickness is controlled; The heat distortion is little; Easily realize that constituency cladding and technical process easily realize automation.In process for modifying surface, laser melting coating has become more active research field.
The 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, the 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 the application laser melting coating is repaired the practical engineering application of some components of machine and is but awaited further popularization, main cause is that the problems such as crackle, coating be inhomogeneous are often arranged in laser cladding process, 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.
Depending on the practical service environment condition difference of workpiece, also different to the performance requirement of surface coating.The 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 the 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; The 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 the 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 at slip, impact wear and abrasive wear under serious condition, simple Ni base, Co base, the not competent instructions for use of Fe base self-melting alloy.
Composite is a kind of novel surface peening engineering material, and metal and metal, metal and pottery, pottery be with ceramic etc., between alloy powder and the range of choice of the collocation between alloy powder and pottery 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.
Can prepare high performance composite coating although adopt composite to carry out laser melting coating, but at present domestic most still research in laboratory, and its preparation technology adopts nickel-based self-fluxing alloy is mixed 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 added is large, density is different from parent metal, and the distribution of particle in cladding layer is often inhomogeneous, usually 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.Can't carry out the commercialization supply, there is not yet at present particle and strengthen the merchandise sales of laser melting coating special powder on market.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 objective of the invention is to avoid above-mentioned deficiency of the prior art, develop and a kind ofly can meet required a kind of 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 present invention can realize with corresponding technology of preparing scheme by design and the interpolation silicide particle of following basic chemical composition:
A kind of silicide particle provided by the present invention strengthens the cladding alloy powder and is comprised of matrix alloy powder and silicide particle and binding agent, and its proportioning is: 50～98% matrix alloy powder, 1～45% SiC or Si
3n
4, MoSi
2, CoSi
2one of them or the combined hybrid body powder more than two kinds, 1～5% binding agent is prepared into the 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
2, CeO
2, Y
3o
2, La
2o
3one of them or the combination more than two kinds≤0.9%, Ni surplus and inevitable impurity element;
Silicide particle provided by the present invention strengthens cladding alloy powder and preparation method thereof, and its step of preparation process is:
Matrix alloy powder preparation → interpolation silicide particle → interpolation binding agent → stirring ball-milling → combination powder → drying → fragmentation → screening; The concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → drying → 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 prepared is carried out to melting in vaccum sensitive stove or intermediate frequency furnace, and fusion temperature is about 1250 ℃-1350 ℃, and control carbon content and reach requirement, after the stokehold adjusting component is qualified, 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: sifting out particle size range by sieving machine is that+150 orders～-350 purpose powder are as finished powder;
(2) add silicide particle
Choose particle size range for+150 orders～commercially available SiC of-400 purpose or Si
3n
4, MoSi
2, CoSi
2one of them or the combined hybrid body powder more than two kinds 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 matrix alloy powder and SiC or the Si prepared
3n
4, MoSi
2, CoSi
2after one of them or the combined hybrid body powder more than two kinds 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 ratios of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, the starting agitating ball mill, abundant stirring ball-milling through 5～60 hours, each component of mixed powder and resin liquid all are evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into the combination powder;
(5) drying
The combination powder that ball milling is good is poured out from ball mill, then through 150 ℃～200 ℃ dryings;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine sift out particle size range for+150 orders～-400 purpose powder 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, the present invention has following advantage:
1) 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) silicide particle enhancing laser melting coating high wear-resistant nickel base alloy powder of the present invention 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) silicide particle prepared 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) 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, can obtain the flawless Laser Clad Alloy Coatings of the large thickness of large tracts of land under the condition without preheating and subsequent heat treatment, cladding layer intensity, hardness and wearability are high, plasticity and toughness are good, and than existing most of used for hot spraying self-fluxing alloy powders and existing most of laser melting coatings alloy powder cost decrease.Can reduce the consumption of strategic rare element, significantly reduce the 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 silicide particle strengthens cladding alloy powder and preparation method thereof, this silicide particle strengthens the cladding alloy powder and is comprised of matrix alloy powder and silicide hard particles and binding agent, its proportioning is: 60% matrix alloy powder, 37% SiC, 3% phenolic resin adhesive is prepared into the combination powder, and 3% phenolic resin adhesive is prepared into the 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, 0.2%La
2o
3, the Ni surplus.
Its manufacturing technology steps:
Matrix alloy powder preparation → interpolation silicide particle → interpolation binding agent → stirring ball-milling → combination powder → drying → fragmentation → screening; The concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → drying → 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 the 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 approximately is 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 the stokehold adjusting component is qualified, tapping temperature is controlled at 1200～1250 ℃.
Atomization: by melting, qualified alloy liquid is poured in the cone bottom pour ladle, start to carry out the atomization of metal dust, open high-pressure inert gas, will be from the gases at high pressure of 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 be cut atomization, atomizing pressure 10～14MPa, the small molten drop by the metal atomization poling, final set becomes alloy powder.Metal dust after solidifying, still quite easily oxidation when high temperature, so must under the environment of anaerobic or hypoxemia, allow its cool to room temperature, 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, and dried metal dust, the chemical examination of chemical analysis is carried out in first sampling, proceeds to next procedure after qualified.
Screening: sifting out particle size range by sieving machine is that+150 orders～-350 purpose powder are as finished powder.
(2) add silicide particle
Choosing particle size range is that the commercially available SiC powder of-250 purpose 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 for preparing and 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 ratios 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 all are evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into the combination powder,
(5) drying
The combination powder that ball milling is good is poured out from ball mill, then through 180 ℃ of dryings;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine sift out particle size range for+150 orders～-400 purpose powder as finished powder, obtain required composition, desired particle size grade and don't the combination powder of solute segregation can occur.
Requirement by the user is sieved, the packing warehouse-in.
Embodiment bis-
A kind of silicide particle strengthens cladding alloy powder and preparation method thereof, and this silicide particle strengthens the cladding alloy powder and is comprised of matrix alloy powder and silicide hard particles and binding agent, and its proportioning is: 68% matrix alloy powder, 30% Si
3n
4, 2% epoxy adhesive is prepared into the 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, the Ni surplus.
(2) add silicide particle
Choose particle size range for the commercially available Si of-400 purpose
3n
4powder is as strengthening hard particles;
(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 matrix alloy powder and the Si prepared
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 ratios 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 all are evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into the combination powder,
Its preparation method is identical with embodiment mono-.
Embodiment tri-
A kind of silicide particle strengthens cladding alloy powder and preparation method thereof, this silicide particle strengthens laser melting coating high wear-resistant nickel base alloy powder and is comprised of matrix alloy powder and silicide hard particles and binding agent, its proportioning is: 68% matrix alloy powder, 30% MoSi
2powder, 2% epoxy adhesive is prepared into the 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, the Ni surplus.
(2) add silicide particle
Choose particle size range for the commercially available MoSi of-200 purpose
2powder is as strengthening particle;
(3) add binding agent
Adopt waterglass to make binding agent, add methanol solvate;
(4) stirring ball-milling
By matrix alloy powder and the MoSi prepared
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 ratios of grinding media to material, the abrading-ball of sphere diameter 18mm joins in agitating ball mill, the starting agitating ball mill, abundant stirring ball-milling through 18 hours, each component of mixed powder and waterglass liquid all are evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into the combination powder;
Its preparation method is identical with embodiment mono-.
The silicide particle of the above composition that the present invention proposes strengthens the 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 silicide particle strengthens cladding alloy powder and preparation method thereof, it is characterized in that: silicide particle strengthens the cladding alloy powder and is comprised of matrix alloy powder and silicide particle and binding agent, its proportioning is: 50～98% matrix alloy powder, 1～45% SiC or Si
3n
4, MoSi
2, CoSi
2one of them or the combined hybrid body powder more than two kinds, 1～5% binding agent is prepared into the 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
2, CeO
2, Y
3o
2, La
2o
3one of them or the combination more than two kinds≤0.9%, Ni surplus and inevitable impurity element; Its step of preparation process is:
Matrix alloy powder preparation → interpolation silicide particle → interpolation binding agent → stirring ball-milling → combination powder → drying → fragmentation → screening; The concrete technology step is as follows:
(1) matrix alloy preparation
The technological process of matrix alloy powder preparation is: batching → melting → atomization → drying → 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 prepared is carried out to melting in vaccum sensitive stove or intermediate frequency furnace, and fusion temperature is about 1250 ℃-1350 ℃, and control carbon content and reach requirement, after the stokehold adjusting component is qualified, 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: sifting out particle size range by sieving machine is that+150 orders～-350 purpose powder are as finished powder;
(2) add silicide particle
Choose particle size range for+150 orders～commercially available SiC of-400 purpose or Si
3n
4, MoSi
2, CoSi
2one of them or the combined hybrid body powder more than two kinds 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 matrix alloy powder and SiC or the Si prepared
3n
4, MoSi
2, CoSi
2after one of them or the combined hybrid body powder more than two kinds 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 ratios of grinding media to material, the abrading-ball of sphere diameter 10～20mm joins in agitating ball mill, the starting agitating ball mill, abundant stirring ball-milling through 5～60 hours, each component of mixed powder and resin liquid all are evenly distributed, each constituent element powder particle is wrapped up, and be bonded together, be prepared into the combination powder;
(5) drying
The combination powder that ball milling is good is poured out from ball mill, then through 150 ℃～200 ℃ dryings;
(6) broken and screening
Dried combination powder is carried out to fragmentation, by sieving machine sift out particle size range for+150 orders～-400 purpose powder 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521755A (en) * | 2013-10-17 | 2014-01-22 | 江苏盛伟模具材料有限公司 | Micro-nano silicide particulate reinforced laser cladding alloy powder and preparing method thereof |
| CN103526102A (en) * | 2013-10-17 | 2014-01-22 | 江苏盛伟模具材料有限公司 | Micro nano silicide particle reinforced laser clad high wear-resistance cobalt-base alloy powder and preparation method thereof |
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| CN104607823A (en) * | 2014-12-12 | 2015-05-13 | 南京大学 | Manufacturing method of spherical self-fluxing alloy solder |
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