CN108097970A - Metal powder injection molding feeding and preparation method thereof - Google Patents

Metal powder injection molding feeding and preparation method thereof Download PDF

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Publication number
CN108097970A
CN108097970A CN201711457974.2A CN201711457974A CN108097970A CN 108097970 A CN108097970 A CN 108097970A CN 201711457974 A CN201711457974 A CN 201711457974A CN 108097970 A CN108097970 A CN 108097970A
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China
Prior art keywords
parts
injection molding
iron
feeding
metal powder
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CN201711457974.2A
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Chinese (zh)
Inventor
庞前列
张伟明
谢庆丰
张柯
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Guangdong Janus Intelligent Group Corp Ltd
Dongguan Huajing Powder Metallurgy Co Ltd
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Application filed by Guangdong Janus Intelligent Group Corp Ltd, Dongguan Huajing Powder Metallurgy Co Ltd filed Critical Guangdong Janus Intelligent Group Corp Ltd
Priority to CN201711457974.2A priority Critical patent/CN108097970A/en
Publication of CN108097970A publication Critical patent/CN108097970A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102Metallic powder coated with organic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/1017Multiple heating or additional steps
    • B22F3/1021Removal of binder or filler
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/02Making ferrous alloys by powder metallurgy
    • C22C33/0257Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Abstract

The invention discloses a kind of metal powder injection molding feeding and preparation method thereof, which includes 2700 iron(-)base powders and forming agent, which includes the component of following parts by weight:Palm is 9 11 parts cured, 57 parts of PBT, 35 parts of polyethylene glycol, 46 parts of nylon, 74 76 parts of polyformaldehyde, and is prepared according to 90 parts of 2700 iron(-)base powders and forming agent than 10 parts to 92 parts of ratios than 8 parts.By the metal powder injection molding feeding for alloy product injection molding technique, there is good fluidity, the advantages that degreasing speed is fast, and density is high, and forming stability is high, and product size is stablized.

Description

Metal powder injection molding feeding and preparation method thereof
Technical field
The present invention relates to metal powder injection molding feedings and preparation method thereof.
Background technology
With the continuous progress of social science and technology and flourishing for global industry, powder metallurgy injection molding technique due to Its plurality of advantages, industry development is rapid, and technology has been widely used in the necks such as military affairs, traffic, machinery, electronics, space flight, aviation Domain.
MIM feedings are core head section technique prepared by metal injection molding product, be by metal powder and forming agent according to Certain proportion carries out the mixing of a period of time temperature, using screw rod under the conditions of certain temperature in all-in-one machine of pelletizing is kneaded Cutting granulation is squeezed out, injection moulding feeding is made.
2700 ferrous alloy materials, because of manufactured fabricated part, hardness is high, and high temperature resistant, mechanical energy is good, and intensity is high therefore wide It is general to use the industries such as military project weapon.2700 traditional ferrous alloy method for manufacturing parts, low production efficiency, processing difficulties are processed into This height, complicated product, which can't process, to be come, and can not meet the manufacturing high speed development demand of modern society completely.
The content of the invention
It is a primary object of the present invention in view of the deficiencies of the prior art, provide a kind of metal powder injection molding feeding and Its preparation method.
To achieve the above object, the present invention uses following technical scheme:
A kind of metal powder injection molding feeding, including 2700 iron(-)base powders and forming agent, 2700 iron-based closes Bronze is last to be prepared by weight 90 parts than 10 parts to 92 parts of ratios than 8 parts with the forming agent;
The forming agent includes the component of following parts by weight:
Palm is 9-11 parts cured;
5-7 parts of PBT;
3-5 parts of polyethylene glycol;
4-6 parts of nylon;
74-76 parts of polyformaldehyde.
Further:
The cured palm is CARNAUBA WAX T3.
The polyethylene glycol is AR grades of molecular weight 2000-6000.
The polyformaldehyde is copolymerized methanal.
2700 iron(-)base powder includes by mass percentage:Fe iron 86-89.6%, Ni nickel 6.5-8.5%, Mo Molybdenum 0.5-0.8%, C carbon 0.05-0.1%, Si silicon 0.1-1%.
The 2700 iron(-)base powder granularity is 500 mesh.
2700 iron(-)base powder includes by mass percentage:Fe iron 89.6%, Ni nickel 8.5%, Mo molybdenums 0.8%, C carbon 0.1%, Si silicon 1%.
A kind of preparation method of the metal powder injection molding feeding, comprises the following steps:
It is homogenously mixed together after 2700 iron(-)base powder is heated with the forming agent, extruding pelletization obtains It is injection moulded feeding.
Further:
It the described method comprises the following steps:
S1, startup kneader rotate at a slow speed 4-6r/min, open equipment and are kneaded chamber temperature, preheat 2700 ferrous alloy Powder is to 180-190 DEG C;
Behind S2, detection powder temperature >=170 DEG C, the forming agent is added in, rotating speed is improved to 30-40r/min, reduces and be kneaded Temperature is to 175-185 DEG C, and after material melts, then constant temperature 20-30min, rear cooling squeeze out cutting granulation feeding.
A kind of method that product is made using the metal powder injection molding feeding, includes the use of the metal powder Injection moulding feeding is injection moulded as feeding, degreasing, sintering processes obtain the product.
A kind of product is the product prepared using the method.
The present invention has the advantages that:
Metal powder injection molding feeding provided by the invention configures specific forming agent to 2700 iron(-)base powders and matches somebody with somebody Side, the palm of the forming agent including 9-11 parts of parts by weight is cured, the polyethylene glycol of 5-7 parts PBT, 3-5 part, 4-6 parts of nylon, 74-76 parts of polyformaldehyde, and match somebody with somebody according to 90 parts of 2700 iron(-)base powders and forming agent than 10 parts to 92 parts of ratios than 8 parts System;By the metal powder injection molding feeding for alloy product injection molding technique, with good fluidity, degreasing speed Soon, the advantages that density is high, and forming stability is high, and product size is stablized, can be applied to 2700 ferrous metals product of labyrinth Production, shorten the process-cycle of traditional 2700 iron-based metal parts production technologies, reduce production cost, promote production effect Rate.
Specific embodiment
It elaborates below to embodiments of the present invention.It is emphasized that the description below was merely exemplary, The scope being not intended to be limiting of the invention and its application.
In one embodiment, a kind of metal powder injection molding feeding, including 2700 iron(-)base powders and forming agent, 2700 iron(-)base powder and the forming agent are prepared by weight 90 parts than 10 parts to 92 parts of ratios than 8 parts;
The forming agent includes the component of following parts by weight:
Palm is 9-11 parts cured;
5-7 parts of PBT;
3-5 parts of polyethylene glycol;
4-6 parts of nylon;
74-76 parts of polyformaldehyde.
In a preferred embodiment, it is CARNAUBA WAX T3 that the palm is cured.
In a preferred embodiment, the polyethylene glycol is AR grades of molecular weight 2000-6000.It can be according to the molten condition of feeding To select optimal molecular weight.
In a preferred embodiment, the polyformaldehyde is copolymerized methanal.
1801 model of injection stage may be employed in nylon.
M90, M450, M570 etc. may be employed in copolymerized methanal.
5-7 parts of PBT is added in formula to be conducive to improve feeding chemical stability.
In a preferred embodiment, 2700 iron(-)base powder includes by mass percentage:Fe iron 86-89.6%, Ni nickel 6.5-8.5%, Mo molybdenum 0.5-0.8%, C carbon 0.05-0.1%, Si silicon 0.1-1%.In a preferred embodiment, described 2700 Iron(-)base powder granularity is 500 mesh.In a preferable specific embodiment, 2700 iron(-)base powder presses quality hundred Dividing includes than meter:Fe iron 89.6%, Ni nickel 8.5%, Mo molybdenums 0.8%, C carbon 0.1%, Si silicon 1%.The formula is particularly advantageous to increase Add the intensity of alloy material.
In another embodiment, a kind of preparation method of the metal powder injection molding feeding, including following step Suddenly:
It is homogenously mixed together after 2700 iron(-)base powder is heated with the forming agent, extruding pelletization obtains It is injection moulded feeding.
In a preferred embodiment, the described method comprises the following steps:
S1, startup kneader rotate at a slow speed 4-6r/min, open equipment and are kneaded chamber temperature, preheat 2700 ferrous alloy Powder is to 180-190 DEG C;
Behind S2, detection powder temperature >=170 DEG C, the forming agent is added in, rotating speed is improved to 30-40r/min, reduces and be kneaded Temperature is to 175-185 DEG C, and after material melts, then constant temperature 20-30min, rear cooling squeeze out cutting granulation feeding.
In another embodiment, a kind of method that product is made using the metal powder injection molding feeding, bag Include be injection moulded using the metal powder injection molding feeding as feeding, degreasing, sintering processes obtain the product.
In another embodiment, a kind of product is the product prepared using the method.
Example one
1. feeding is prepared:
It 5 kilograms of 2700 iron(-)base powder is poured into kneader is in advance kneaded chamber and be preheating to 180-190 DEG C, start kneader 4-6r/min is rotated at a slow speed, behind 2700 iron(-)base powder temperature >=170 DEG C, adds in forming agent:Cured 50 grams of palm, PBT 30 Gram, 20 grams of polyethylene glycol, 25 grams of nylon, 375 grams of polyformaldehyde, reduction equipment is kneaded chamber temperature to 175-185 DEG C, until material melts After change, then cooling squeezes out cutting granulation feeding after constant temperature 20-30min.
2. material is molded:
Standard batten mold is taken in selection, and batten size 100mm*10mm*5mm is installed on injection (mo(u)lding) machine, is heated to Suitable temperature, 80 DEG C~120 DEG C of mold temperature, injector expects pipe melting maximum temperature are no more than 195 DEG C, set rational project Molding parameter obtains corresponding product.Density criterion is 5.4 ± 0.03g/cm3.
It is 3. degreasing sintered:
After moulded products are weighed, nitric acid catalysis degreasing, 110 DEG C -120 DEG C of skimming temp, nitric acid injection rate 2-3g/ are carried out Min, when degreasing time 3-5 is small, product total weight loss rate is more than after more than the 70% of forming agent total weight or tomography is without apparent Hard formation is sandwich, carries out vacuum-sintering, is sintered vacuum degree 500Pa-10Pa, and 1250-1300 DEG C of temperature when soaking time 2-3 is small, goes out 2700 iron-based metal parts products, density >=7.8g/cm3 are obtained after stove.
After tested, feeding good product mobility, degreasing speed is fast, and density is high, and forming stability is high, the product of injection molding Dimensionally stable, can be applied to the production of 2700 ferrous metals product of labyrinth, and production efficiency is high.
Example two
1. feeding is prepared:
It 4.968 kilograms of 2700 iron(-)base powder is poured into kneader is in advance kneaded chamber and be preheating to 180-190 DEG C, startup is pinched Conjunction machine rotates at a slow speed 4-6r/min, behind 2700 iron(-)base powder temperature >=170 DEG C, adds in forming agent:Palm cured 38.88 Gram, 21.6 grams of PBT, 17.28 grams of polyethylene glycol, 25.92 grams of nylon, 328.32 grams of polyformaldehyde, reduction equipment mixing chamber temperature is extremely 175-185 DEG C, after material melts, then cooling squeezes out cutting granulation feeding after constant temperature 20-30min.
2. material is molded:
Standard batten mold is taken in selection, and batten size 100mm*10mm*5mm is installed on injection (mo(u)lding) machine, is heated to Suitable temperature, 80 DEG C~120 DEG C of mold temperature, injector expects pipe melting maximum temperature are no more than 195 DEG C, set rational project Molding parameter obtains corresponding product.Density criterion is 5.4 ± 0.03g/cm3.
It is 3. degreasing sintered:
After moulded products are weighed, nitric acid catalysis degreasing, 110 DEG C -120 DEG C of skimming temp, nitric acid injection rate 2-3g/ are carried out Min, when degreasing time 3-5 is small, product total weight loss rate is more than after more than the 70% of forming agent total weight or tomography is without apparent Hard formation is sandwich, carries out vacuum-sintering, is sintered vacuum degree 500Pa-10Pa, and 1250-1300 DEG C of temperature when soaking time 2-3 is small, goes out 2700 iron-based metal parts products, density >=7.8g/cm3 are obtained after stove.
After tested, feeding good product mobility, degreasing speed is fast, and density is high, and forming stability is high, the product of injection molding Dimensionally stable, can be applied to the production of 2700 ferrous metals product of labyrinth, and production efficiency is high.
Example three
1. feeding is prepared:
It 9.1 kilograms of 2700 iron(-)base powder is poured into kneader is in advance kneaded chamber and be preheating to 180-190 DEG C, start and mediate Machine rotates at a slow speed 4-6r/min, behind 2700 iron(-)base powder temperature >=170 DEG C, adds in forming agent:Cured 90 grams of palm, PBT 54 grams, 36 grams of polyethylene glycol, 45 grams of nylon, 675 grams of polyformaldehyde, reduction equipment is kneaded chamber temperature to 175-185 DEG C, until material After thawing, then cooling squeezes out cutting granulation feeding after constant temperature 20-30min.
2. material is molded:
Standard batten mold is taken in selection, and batten size 100mm*10mm*5mm is installed on injection (mo(u)lding) machine, is heated to Suitable temperature, 80 DEG C~120 DEG C of mold temperature, injector expects pipe melting maximum temperature are no more than 195 DEG C, set rational project Molding parameter obtains corresponding product.Density criterion is 5.4 ± 0.03g/cm3.
It is 3. degreasing sintered:
After moulded products are weighed, nitric acid catalysis degreasing, 110 DEG C -120 DEG C of skimming temp, nitric acid injection rate 2-3g/ are carried out Min, when degreasing time 3-5 is small, product total weight loss rate is more than after more than the 70% of forming agent total weight or tomography is without apparent Hard formation is sandwich, carries out vacuum-sintering, is sintered vacuum degree 500Pa-10Pa, and 1250-1300 DEG C of temperature when soaking time 2-3 is small, goes out 2700 iron-based metal parts products, density >=7.8g/cm3 are obtained after stove.
After tested, feeding good product mobility, degreasing speed is fast, and density is high, and forming stability is high, the product of injection molding Dimensionally stable, can be applied to the production of 2700 ferrous metals product of labyrinth, and production efficiency is high.
Example four
1. feeding is prepared:
It 4.5 kilograms of 2700 iron(-)base powder is poured into kneader is in advance kneaded chamber and be preheating to 180-190 DEG C, start and mediate Machine rotates at a slow speed 4-6r/min, behind 2700 iron(-)base powder temperature >=170 DEG C, adds in forming agent:Cured 50 grams of palm, PBT 30 grams, 20 grams of polyethylene glycol, 25 grams of nylon, 375 grams of polyformaldehyde, reduction equipment is kneaded chamber temperature to 175-185 DEG C, until material After thawing, then cooling squeezes out cutting granulation feeding after constant temperature 20-30min.
2. material is molded:
Standard batten mold is taken in selection, and batten size 100mm*10mm*5mm is installed on injection (mo(u)lding) machine, is heated to Suitable temperature, 80 DEG C~120 DEG C of mold temperature, injector expects pipe melting maximum temperature are no more than 195 DEG C, set rational project Molding parameter obtains corresponding product.Density criterion is 5.4 ± 0.03g/cm3.
It is 3. degreasing sintered:
After moulded products are weighed, nitric acid catalysis degreasing, 110 DEG C -120 DEG C of skimming temp, nitric acid injection rate 2-3g/ are carried out Min, when degreasing time 3-5 is small, product total weight loss rate is more than after more than the 70% of forming agent total weight or tomography is without apparent Hard formation is sandwich, carries out vacuum-sintering, is sintered vacuum degree 500Pa-10Pa, and 1250-1300 DEG C of temperature when soaking time 2-3 is small, goes out 2700 iron-based metal parts products, density >=7.8g/cm3 are obtained after stove.
After tested, feeding good product mobility, degreasing speed is fast, and density is high, and forming stability is high, the product of injection molding Dimensionally stable, can be applied to the production of 2700 ferrous metals product of labyrinth, and production efficiency is high.
The above content is combine specific/preferred embodiment further description made for the present invention, it is impossible to recognize The specific implementation of the fixed present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, Without departing from the inventive concept of the premise, some replacements or modification can also be made to the embodiment that these have been described, And these are substituted or variant should all be considered as belonging to protection scope of the present invention.

Claims (10)

1. a kind of metal powder injection molding feeding, which is characterized in that described including 2700 iron(-)base powders and forming agent 2700 iron(-)base powders and the forming agent are prepared by weight 90 parts than 10 parts to 92 parts of ratios than 8 parts;
The forming agent includes the component of following parts by weight:
Palm is 9-11 parts cured;
5-7 parts of PBT;
3-5 parts of polyethylene glycol;
4-6 parts of nylon;
74-76 parts of polyformaldehyde.
2. metal powder injection molding feeding as described in claim 1, which is characterized in that the cured palm is CARNAUBA WAX T3。
3. metal powder injection molding feeding as claimed in claim 1 or 2, which is characterized in that the polyethylene glycol is AR grades Molecular weight 2000-6000.
4. metal powder injection molding feeding as described in any one of claims 1 to 3, which is characterized in that the polyformaldehyde is Copolymerized methanal.
5. such as Claims 1-4 any one of them metal powder injection molding feeding, which is characterized in that 2700 iron-based Alloy powder includes by mass percentage:Fe iron 86-89.6%, Ni nickel 6.5-8.5%, Mo molybdenum 0.5-0.8%, C carbon 0.05- 0.1%, Si silicon 0.1-1%;Preferably, alloy powder granularity is 500 mesh.
6. metal powder injection molding feeding as claimed in claim 5, which is characterized in that 2700 iron(-)base powder is pressed Mass percent meter includes:Fe iron 89.6%, Ni nickel 8.5%, Mo molybdenums 0.8%, C carbon 0.1%, Si silicon 1%.
7. a kind of preparation method of such as claim 1 to 6 any one of them metal powder injection molding feeding, feature exist In comprising the following steps:
It is homogenously mixed together after 2700 iron(-)base powder is heated with the forming agent, extruding pelletization is injected It is molded feeding.
8. the preparation method of metal powder injection molding feeding as claimed in claim 7, which is characterized in that including following step Suddenly:
S1, startup kneader rotate at a slow speed 4-6r/min, open equipment and are kneaded chamber temperature, preheat 2700 iron(-)base powder To 180-190 DEG C;
Behind S2, detection powder temperature >=170 DEG C, the forming agent is added in, rotating speed is improved to 30-40r/min, reduces melting temperature To 175-185 DEG C, after material melts, then constant temperature 20-30min, rear cooling squeeze out cutting granulation feeding.
9. a kind of method using such as claim 1 to 6 any one of them metal powder injection molding feeding making product, It is characterized in that, includes the use of that the metal powder injection molding feeding is injection moulded as feeding, degreasing, sintering processes obtain To the product.
10. a kind of product, which is characterized in that be the product prepared using method as claimed in claim 9.
CN201711457974.2A 2017-12-28 2017-12-28 Metal powder injection molding feeding and preparation method thereof Pending CN108097970A (en)

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CN108994289A (en) * 2018-07-18 2018-12-14 东莞华晶粉末冶金有限公司 Environment-friendly type iron-based powder is injection moulded the preparation method of feeding and iron-base part product
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CN109047750A (en) * 2018-07-18 2018-12-21 东莞华晶粉末冶金有限公司 The preparation method of 310 powder of stainless steel feeding of environment-friendly type and 310 powder of stainless steel components
CN111390185A (en) * 2020-04-14 2020-07-10 东莞市金材五金有限公司 Production method of titanium alloy part
CN111621722A (en) * 2019-02-28 2020-09-04 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body

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CN108941573A (en) * 2018-06-26 2018-12-07 深圳市鑫迪科技有限公司 Feeding powder for metal powder injection molding
CN108994289A (en) * 2018-07-18 2018-12-14 东莞华晶粉末冶金有限公司 Environment-friendly type iron-based powder is injection moulded the preparation method of feeding and iron-base part product
CN109047749A (en) * 2018-07-18 2018-12-21 东莞华晶粉末冶金有限公司 The preparation method of environment-friendly type cemented carbide powder feeding and hard alloy components
CN109047750A (en) * 2018-07-18 2018-12-21 东莞华晶粉末冶金有限公司 The preparation method of 310 powder of stainless steel feeding of environment-friendly type and 310 powder of stainless steel components
CN111621722A (en) * 2019-02-28 2020-09-04 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body
CN111621722B (en) * 2019-02-28 2021-12-31 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body
CN111390185A (en) * 2020-04-14 2020-07-10 东莞市金材五金有限公司 Production method of titanium alloy part

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