CN106636969A - High-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof - Google Patents

High-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof Download PDF

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Publication number
CN106636969A
CN106636969A CN201611007361.4A CN201611007361A CN106636969A CN 106636969 A CN106636969 A CN 106636969A CN 201611007361 A CN201611007361 A CN 201611007361A CN 106636969 A CN106636969 A CN 106636969A
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powder
parts
minutes
engine valve
iron
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Inventor
周以林
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Ma'anshan Hengxin Pressure Reducer Manufacturing Co Ltd
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Ma'anshan Hengxin Pressure Reducer Manufacturing Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1035—Liquid phase sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0214—Using a mixture of prealloyed powders or a master alloy comprising P or a phosphorus compound
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0221—Using a mixture of prealloyed powders or a master alloy comprising S or a sulfur compound
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0228—Using a mixture of prealloyed powders or a master alloy comprising other non-metallic compounds or more than 5% of graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making 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%
    • C22C33/0285—Making 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%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring. The high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring is made from, by weight, 6.2-6.4 parts of chrome, 4.2-4.4 parts of cobalt, 0.7-0.9 part of nickel, 0.5-0.7 part of titanium, 0.3-0.5 part of cerium, 18-19 parts of copper, 1.2-1.5 parts of nano molybdenum disulfide, 0.7-0.9 part of tungsten carbide, 1-2 parts of manganese dioxide, 0.4-0.6 part of methyl triethoxy silane, 2.1-2.4 parts of ferro boron powder, 0.2-0.4 part of aluminum dihydrogen phosphate, 2-3 parts of polytetrafluoroethylene powder and 64-68 parts of iron. According to the high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring, the surface of the modified nano molybdenum disulfide is covered with a layer of copper film to be added into a matrix material as a solid lubricating agent; and meanwhile, manganese dioxide, titanium, cerium and other elements are added, the sintering, melt infiltration and heat treatment process is adopted to change the phase change of metal particles, and the manufactured product has high hardness and high high-temperature stability.

Description

A kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers and its system Make method
Technical field
The present invention relates to automobile engine accessory technical field, more particularly to a kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers and preparation method thereof.
Background technology
Compressed natural gas (CNG), liquefied petroleum gas (LPG) and methyl alcohol etc. are environmental protections as the substitute fuel of internal combustion engine With the effective way of reasonable energy utilization.China's natural gas aboundresources, as engine washing fuel, its market prospects is huge. However, using novel energy, auto parts are particularly the applying working condition of engine valve retainer and can change, to its material Propose new requirement.The Valve seat circle of CNG engines is to control the important process portion that combustion gas suction is discharged with waste gas Part, undergoes at high temperature the erosion of air-flow and the high-frequency impact friction of valve, and condition of work is very severe.Once valve retainer By impact wear, cause valve air-tightness to reduce, engine efficiency, and a large amount of rows of harmful components gas will be greatly lowered Put.This requires that CNG engine valve retainers have a higher heat resistance, higher wearability and corrosion resistance.
Conventional valve retainer material includes casting alloy, forged steel product and the big class of powder metallurgy 3.Wherein powder metallurgy gas Seat ring is because having the advantages that less, suitable large batch of production big without cutting, stock utilization height, design freedom.General Properties of Powder Metallurgy Iron-based Material haves the shortcomings that low-density and sponginess, wear out failure easily occurs in use, at present, most often There are two kinds of solutions：One is that addition alloying element forms hard phase, improves the intensity and hardness of material, has been obtained Wearability：Two is the density and performance that material is improved by infiltration process.Document《Preparation technology is to iron-base steam valve base made by powder metallurgy The impact of circle compactness and performance》High-performance Fe-based powder metallurgy valve retainer is prepared for using sintering, infiltration, heat treatment.Grind Study carefully impact of the different process to the hole change of valve retainer, compactness, microscopic structure and mechanical property, determine that valve retainer is caused The optimum process condition of close property.As a result show, using infiltration or raising sintering temperature, the shape that can make hole tends to nodularization, greatly The big quantity and size for reducing hole, hence it is evident that improve the compactness of valve retainer.
Because valve retainer oil-free lubrication in the course of the work, weatherability are poor, service life is short, wear-resisting long-lasting difference, and Studied by way of adding hard particles, self-lubricating additive etc. and being combined using infiltration new technology at present seldom.Document In it is more single only with infiltration new technology, mode, obtained valve retainer idiosome poor toughness, cutting are poor, temperature-change resistance Low, service life is short etc..
The content of the invention
The object of the invention is exactly to make up the defect of prior art, there is provided a kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers and preparation method thereof.
The present invention is achieved by the following technical solutions：
A kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers, are prepared by the raw materials in：Chromium 6.2-6.4, cobalt 4.2-4.4, nickel 0.7-0.9, titanium 0.5-0.7, cerium 0.3-0.5, copper 18-19, nano molybdenum disulfide 1.2-1.5, Tungsten carbide 0.7-0.9, manganese dioxide 1-2, MTES 0.4-0.6, ferro-boron powder 2.1-2.4, biphosphate Aluminium 0.2-0.4, polytetrafluoroethylene powder 2-3, iron 64-68.
A kind of preparation method of described high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers, including with Lower step：
（1）Nano molybdenum disulfide is added in the aluminium dihydrogen phosphate aqueous solution that mass concentration is 5-15%, ultrasonic disperse is uniform, MTES is added to be heated to 50-70 DEG C, stirring 12-24 hours are spray-dried；
（2）Copper powder is put into and be brought rapidly up in crucible electrical resistance furnace to being completely melt, add step（1）The stirring of material ultrasonic wave is mixed Even, insulation stands 20-25 minutes, molten metal Jing powder by gas-atomization equipment is obtained into copper clad of the particle diameter below 100 μm and is modified Nano molybdenum disulfide；
（3）By ferro-boron powder, tungsten carbide in 600-700 DEG C of high-temperature calcination 20-30 minute, it is immediately placed in water and is cooled to room temperature Ultrasonic disperse 10-15 minutes, it is spray-dried, in putting into appropriate absolute ethyl alcohol, adds manganese dioxide, step（2）Material grinds 40- 50 minutes, dry to absolute ethyl alcohol is completely removed, obtain mixed powder；
（4）By ball milling mixing in iron powder and chromium, cobalt, nickel, titanium, the mixed powder machine of cerium powder input, step is added（3）Mixed powder, poly- four PVF powder is heated to 50-60 DEG C, and stirring 30-40 minutes are vacuum dried, and are added in mould and are pressed into required form, are given birth to Base；
（5）The copper sheet of above-mentioned green compact and same shape is put into push rod furnace, in 1000-1200 DEG C under the protective atmosphere of hydrogen Sintering and infiltration 1-2 hours, with the water jacket type of cooling room temperature is cooled to；
（6）Valve retainer after the completion of sintering and infiltration is placed in batch-type furnace, 600-700 DEG C is heated to, 20-40 minutes are incubated, Oil quenching is heated to 245-255 DEG C to room temperature, is incubated 50-70 minutes, cooling discharging.
It is an advantage of the invention that：Modified nano molybdenum disulfide surface is covered one layer of copper film and is moistened as solid by the present invention Lubrication prescription is added in matrix material, and density contrast is little, physical and mechanical properties are close, improves its wellability and interface with matrix Bond strength is high, and density is significantly improved, and reduces segregation, while the intensity and frictional behaviour of material is improve, and clad can To play a part of evaporation or the oxidation of protecting kollag to cause from high temperature；Also addition manganese dioxide simultaneously of the invention, The compositions such as titanium, cerium, using sintering, infiltration, Technology for Heating Processing metallic phase transformation is changed, and is largely filled with valve retainer Hole, reduces the porosity of valve retainer material, the compactness of valve retainer is improve, so as to improve the tough of valve retainer Property, wearability, thermohardening and compactness, product of the present invention has higher hardness and high-temperature stability.
Specific embodiment
A kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers, are prepared by the raw materials in： Chromium 6.2, cobalt 4.2, nickel 0.7, titanium 0.5, cerium 0.3, copper 18, nano molybdenum disulfide 1.2, tungsten carbide 0.7, manganese dioxide 1, methyl three Ethoxysilane 0.4, ferro-boron powder 2.1, aluminium dihydrogen phosphate 0.2, polytetrafluoroethylene powder 2, iron 64.
A kind of preparation method of described high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers, including with Lower step：
（1）Nano molybdenum disulfide is added in the aluminium dihydrogen phosphate aqueous solution that mass concentration is 5-15%, ultrasonic disperse is uniform, MTES is added to be heated to 50-70 DEG C, stirring 12-24 hours are spray-dried；
（2）Copper powder is put into and be brought rapidly up in crucible electrical resistance furnace to being completely melt, add step（1）The stirring of material ultrasonic wave is mixed Even, insulation stands 20-25 minutes, molten metal Jing powder by gas-atomization equipment is obtained into copper clad of the particle diameter below 100 μm and is modified Nano molybdenum disulfide；
（3）By ferro-boron powder, tungsten carbide in 600-700 DEG C of high-temperature calcination 20-30 minute, it is immediately placed in water and is cooled to room temperature Ultrasonic disperse 10-15 minutes, it is spray-dried, in putting into appropriate absolute ethyl alcohol, adds manganese dioxide, step（2）Material grinds 40- 50 minutes, dry to absolute ethyl alcohol is completely removed, obtain mixed powder；
（4）By ball milling mixing in iron powder and chromium, cobalt, nickel, titanium, the mixed powder machine of cerium powder input, step is added（3）Mixed powder, poly- four PVF powder is heated to 50-60 DEG C, and stirring 30-40 minutes are vacuum dried, and are added in mould and are pressed into required form, are given birth to Base；
（5）The copper sheet of above-mentioned green compact and same shape is put into push rod furnace, in 1000-1200 DEG C under the protective atmosphere of hydrogen Sintering and infiltration 1-2 hours, with the water jacket type of cooling room temperature is cooled to；
（6）Valve retainer after the completion of sintering and infiltration is placed in batch-type furnace, 600-700 DEG C is heated to, 20-40 minutes are incubated, Oil quenching is heated to 245-255 DEG C to room temperature, is incubated 50-70 minutes, cooling discharging.
There is following technical characteristic using CNG engine valve retainers obtained in the present invention：
（1）Density/(g cm-3)：7.86；
（2）Open porosity/%：0.06；
（3）Hardness/HRC：52；
（4）Maximum load Fmax/kN：2.375；
（5）Coefficient of friction：0.086.

Claims (2)

1. a kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers, it is characterised in that by following weight portion Raw material is made：Chromium 6.2-6.4, cobalt 4.2-4.4, nickel 0.7-0.9, titanium 0.5-0.7, cerium 0.3-0.5, copper 18-19, nanometer curing Molybdenum 1.2-1.5, tungsten carbide 0.7-0.9, manganese dioxide 1-2, MTES 0.4-0.6, ferro-boron powder 2.1- 2.4th, aluminium dihydrogen phosphate 0.2-0.4, polytetrafluoroethylene powder 2-3, iron 64-68.
2. the making of a kind of high rigidity ferrous based powder metallurgical self-lubricating CNG engine valve retainers according to claim 1 Method, it is characterised in that comprise the following steps：
（1）Nano molybdenum disulfide is added in the aluminium dihydrogen phosphate aqueous solution that mass concentration is 5-15%, ultrasonic disperse is uniform, MTES is added to be heated to 50-70 DEG C, stirring 12-24 hours are spray-dried；
（2）Copper powder is put into and be brought rapidly up in crucible electrical resistance furnace to being completely melt, add step（1）The stirring of material ultrasonic wave is mixed Even, insulation stands 20-25 minutes, molten metal Jing powder by gas-atomization equipment is obtained into copper clad of the particle diameter below 100 μm and is modified Nano molybdenum disulfide；
（3）By ferro-boron powder, tungsten carbide in 600-700 DEG C of high-temperature calcination 20-30 minute, it is immediately placed in water and is cooled to room temperature Ultrasonic disperse 10-15 minutes, it is spray-dried, in putting into appropriate absolute ethyl alcohol, adds manganese dioxide, step（2）Material grinds 40- 50 minutes, dry to absolute ethyl alcohol is completely removed, obtain mixed powder；
（4）By ball milling mixing in iron powder and chromium, cobalt, nickel, titanium, the mixed powder machine of cerium powder input, step is added（3）Mixed powder, poly- four PVF powder is heated to 50-60 DEG C, and stirring 30-40 minutes are vacuum dried, and are added in mould and are pressed into required form, are given birth to Base；
（5）The copper sheet of above-mentioned green compact and same shape is put into push rod furnace, in 1000-1200 DEG C under the protective atmosphere of hydrogen Sintering and infiltration 1-2 hours, with the water jacket type of cooling room temperature is cooled to；
（6）Valve retainer after the completion of sintering and infiltration is placed in batch-type furnace, 600-700 DEG C is heated to, 20-40 minutes are incubated, Oil quenching is heated to 245-255 DEG C to room temperature, is incubated 50-70 minutes, cooling discharging.
CN201611007361.4A 2016-11-16 2016-11-16 High-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof Pending CN106636969A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111390162A (en) * 2020-05-07 2020-07-10 上海凯林新技术实业公司 Preparation and application method of aluminum-coated polytetrafluoroethylene powder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101634238A (en) * 2009-08-31 2010-01-27 桐城市汽车部件有限公司 Temperature-pressure-die wall lubrication valve seat containing rare earth powder metallurgy and manufacturing method thereof
CN103589967A (en) * 2013-10-23 2014-02-19 桐城市汽车部件有限公司 Rare earth-containing powder metallurgy natural gas engine valve seat ring
CN104399966A (en) * 2014-10-27 2015-03-11 奚杰 Powder metallurgy valve seat containing nano Fe
CN106041047A (en) * 2016-05-31 2016-10-26 合肥正浩机械科技有限公司 Powder metallurgy high-strength bearing material and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101634238A (en) * 2009-08-31 2010-01-27 桐城市汽车部件有限公司 Temperature-pressure-die wall lubrication valve seat containing rare earth powder metallurgy and manufacturing method thereof
CN103589967A (en) * 2013-10-23 2014-02-19 桐城市汽车部件有限公司 Rare earth-containing powder metallurgy natural gas engine valve seat ring
CN104399966A (en) * 2014-10-27 2015-03-11 奚杰 Powder metallurgy valve seat containing nano Fe
CN106041047A (en) * 2016-05-31 2016-10-26 合肥正浩机械科技有限公司 Powder metallurgy high-strength bearing material and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111390162A (en) * 2020-05-07 2020-07-10 上海凯林新技术实业公司 Preparation and application method of aluminum-coated polytetrafluoroethylene powder

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Application publication date: 20170510