CN112593163A - Powder metallurgy seat ring material with hard particles - Google Patents

Powder metallurgy seat ring material with hard particles Download PDF

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Publication number
CN112593163A
CN112593163A CN202011591561.5A CN202011591561A CN112593163A CN 112593163 A CN112593163 A CN 112593163A CN 202011591561 A CN202011591561 A CN 202011591561A CN 112593163 A CN112593163 A CN 112593163A
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seat ring
product
hard particles
powder
powder metallurgy
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CN202011591561.5A
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Chinese (zh)
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冯友蓬
严云飞
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Jiujiang Tianshi Powder Products Co ltd
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Jiujiang Tianshi Powder Products Co ltd
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Priority to CN202011591561.5A priority Critical patent/CN112593163A/en
Publication of CN112593163A publication Critical patent/CN112593163A/en
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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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • 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
    • C22C33/0242—Making ferrous alloys by powder metallurgy using the impregnating technique
    • 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%
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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

Abstract

The invention belongs to the technical field of seat rings, and particularly relates to a powder metallurgy seat ring material with hard particles, which comprises the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8 to 2.7 percent of Fe, and the balance of Fe; the powder metallurgy seat ring disclosed by the invention consists of C, Cu, Cr, Si, Mo, Co, W, V and Fe elements, and on the basis of the original elements, hard particles and a structure strengthening phase are added, so that the structural strength of a seat ring product is greatly improved, the wear resistance and high temperature resistance of the seat ring product are improved, and the complex working condition requirements of equipment such as a diesel engine and a natural gas engine can be met.

Description

Powder metallurgy seat ring material with hard particles
Technical Field
The invention belongs to the technical field of seat rings, and particularly relates to a powder metallurgy seat ring material with hard particles.
Background
The valve is used for specially inputting air into the engine and discharging combusted waste gas, and is divided into an air inlet valve and an exhaust valve from the structure of the engine, wherein the air inlet valve is used for sucking air into the engine and mixing and combusting the air and fuel; the exhaust valve is used for discharging combusted waste gas and dissipating heat.
The valve is the core spare part of equipment such as diesel engine, natural gas engine, and in equipment such as diesel engine, natural gas engine, the bearing is indispensable, still installs a core part in the bearing usually, that is the bearing race, because equipment such as diesel engine, natural gas engine can make the valve be under the operational environment of high temperature when moving, consequently need require the bearing race to have better high temperature resistant characteristic.
However, the strength of the traditional bearing race is low when the bearing race is used, and the damage rate of the bearing race is inevitably improved because the race needs to be in direct rigid contact with parts such as a bearing and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a powder metallurgy seat ring material with hard particles, which has the characteristic of long service life.
In order to achieve the purpose, the invention provides the following technical scheme: a powder metallurgy seat ring material with hard particles comprises the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8 to 2.7 percent of the total weight of the alloy, and the balance of Fe.
As a preferred technical scheme of the invention, the material comprises the following raw materials by weight: c: 0.6%, Cu: 8.0%, Cr: 2.8%, Si: 0.4%, Mo: 7.6%, Co: 11.0%, W: 1.3%, V: 0.8 percent and the balance of Fe.
As a preferred technical scheme of the invention, the material comprises the following raw materials by weight: c: 1.0%, Cu: 15%, Cr: 4.7%, Si: 1.6%, Mo: 11.3%, Co: 17%, W: 3.4%, V: 1.75 percent and the balance of Fe.
As a preferred technical scheme of the invention, the material comprises the following raw materials by weight: c: 1.4%, Cu: 22.0%, Cr: 6.6%, Si: 2.8%, Mo: 15.0%, Co: 23.0%, W: 5.5%, V: 2.7 percent and the balance of Fe.
The preparation process of the powder metallurgy seat ring material with hard particles comprises the following steps:
(1) drying the powder C for four hours at the temperature of 200 ℃, and taking the powder in percentage by mass for later use;
(2) uniformly mixing the prepared powder materials according to the proportion;
(3) pressing the mixed finished powder into a product blank;
(4) continuously sintering the product blank in a vacuum sintering furnace at the temperature of 680-1200 ℃ for 5-9 hours, stacking the product blank and the copper sheet for 2-10 layers, and melting the copper sheet and filling the pores of the product blank into the product when the temperature is higher than 1083 ℃, so that the pores which cannot be completely eliminated when the product is pressed are filled;
(5) placing the sintered product in a cryogenic treatment device for cold treatment for 1-2 hours at the temperature of-200-120 ℃ to eliminate the internal stress of the product;
(6) and (3) placing the product after the cold treatment in a high-temperature tempering furnace for tempering treatment under the environment of 500-750 ℃, so as to improve the toughness of the product.
Compared with the prior art, the invention has the beneficial effects that: the powder metallurgy seat ring disclosed by the invention consists of C, Cu, Cr, Si, Mo, Co, W, V and Fe elements, and on the basis of the original elements, hard particles and a structure strengthening phase are added, so that the structural strength of a seat ring product is greatly improved, the wear resistance and high temperature resistance of the seat ring product are improved, and the complex working condition requirements of equipment such as a diesel engine and a natural gas engine can be met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic metallographic structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides the following technical solutions: a powder metallurgy seat ring material with hard particles comprises the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8% -2.7%, the balance of Fe, and the metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 30-55HRC, material density: 6.5-7.8g/cm3Radial pressure feed strength: not less than 500 MPa.
Specifically, in this embodiment, the reference powder is made of powder high-speed tool steel, and further includes the following raw materials in parts by weight: c: 0.6%, Cu: 8.0%, Cr: 2.8%, Si: 0.4%, Mo: 7.6%, Co: 11.0%, W: 1.3%, V: 0.8%, the balance being Fe, metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 30HRC, material density: 6.5g/cm3Radial pressure feed strength: not less than 500 MPa.
Element(s) C Cu Cr Si Mo Co W V Balance of
The content wt% 0.6 8.0 2.8 0.4 7.6 11.0 1.3 0.8 Fe
The preparation process comprises the following steps: powder preparation → powder mixing → press forming → sintering → cold treatment → tempering;
(1) drying the powder C for four hours at the temperature of 200 ℃, and taking the powder in percentage by mass for later use; (2) uniformly mixing the prepared powder materials according to the proportion; (3) pressing the mixed finished powder into a product blank; (4) continuously sintering the product blank in a vacuum sintering furnace at the temperature of 680-1200 ℃ for 5-9 hours, stacking the product blank and the copper sheet for 2-10 layers, and melting the copper sheet and filling the pores of the product blank into the product when the temperature is higher than 1083 ℃, so that the pores which cannot be completely eliminated when the product is pressed are filled; (5) placing the sintered product in a cryogenic treatment device for cold treatment for 1-2 hours at the temperature of-200-120 ℃ to eliminate the internal stress of the product; (6) and (3) placing the product after the cold treatment in a high-temperature tempering furnace for tempering treatment under the environment of 500-750 ℃, so as to improve the toughness of the product.
Example 2
Referring to fig. 1, the present invention provides the following technical solutions: a powder metallurgy seat ring material with hard particles comprises the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8% -2.7%, the balance of Fe, and the metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 30-55HRC, material density: 6.5-7.8g/cm3Radial pressure feed strength: not less than 500 MPa.
Specifically, in this embodiment, the reference powder is made of powder high-speed tool steel, and further includes the following raw materials in parts by weight: c: 1.0%, Cu: 15%, Cr: 4.7%, Si: 1.6%, Mo: 11.3%, Co: 17%, W: 3.4%, V: 1.75%, the balance being Fe, metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 42.5HRC, material density: 7.15g/cm3Radial pressure feed strength: not less than 510 MPa.
Element(s) C Cu Cr Si Mo Co W V Balance of
The content wt% 1.0 15 4.7 1.6 11.3 17 3.4 1.75 Fe
The preparation process comprises the following steps: powder preparation → powder mixing → press forming → sintering → cold treatment → tempering;
(1) drying the powder C for four hours at the temperature of 200 ℃, and taking the powder in percentage by mass for later use; (2) uniformly mixing the prepared powder materials according to the proportion; (3) pressing the mixed finished powder into a product blank; (4) continuously sintering the product blank in a vacuum sintering furnace at the temperature of 680-1200 ℃ for 5-9 hours, stacking the product blank and the copper sheet for 2-10 layers, and melting the copper sheet and filling the pores of the product blank into the product when the temperature is higher than 1083 ℃, so that the pores which cannot be completely eliminated when the product is pressed are filled; (5) placing the sintered product in a cryogenic treatment device for cold treatment for 1-2 hours at the temperature of-200-120 ℃ to eliminate the internal stress of the product; (6) and (3) placing the product after the cold treatment in a high-temperature tempering furnace for tempering treatment under the environment of 500-750 ℃, so as to improve the toughness of the product.
Example 3
Referring to fig. 1, the present invention provides the following technical solutions: a powder metallurgy seat ring material with hard particles comprises the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8% -2.7%, the balance of Fe, and the metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 30-55HRC, material density: 6.5-7.8g/cm3Radial pressure feed strength: not less than 500 MPa.
Specifically, in this embodiment, the reference powder is made of powder high-speed tool steel, and further includes the following raw materials in parts by weight: c: 1.4%, Cu: 22.0%, Cr: 6.6%, Si: 2.8%, Mo: 15.0%, Co: 23.0%, W: 5.5%, V: 2.7%, the balance being Fe, the metallographic structure: tempered martensite, hard phase, copper and solid lubricant, wherein the material hardness is as follows: 55HRC, material density: 7.8g/cm3Radial pressure feed strength: not less than 520 MPa.
Element(s) C Cu Cr Si Mo Co W V Balance of
The content wt% 1.4 22.0 6.6 2.8 15.0 23.0 5.5 2.7 Fe
The preparation process comprises the following steps: powder preparation → powder mixing → press forming → sintering → cold treatment → tempering;
(1) drying the powder C for four hours at the temperature of 200 ℃, and taking the powder in percentage by mass for later use; (2) uniformly mixing the prepared powder materials according to the proportion; (3) pressing the mixed finished powder into a product blank; (4) continuously sintering the product blank in a vacuum sintering furnace at the temperature of 680-1200 ℃ for 5-9 hours, stacking the product blank and the copper sheet for 2-10 layers, and melting the copper sheet and filling the pores of the product blank into the product when the temperature is higher than 1083 ℃, so that the pores which cannot be completely eliminated when the product is pressed are filled; (5) placing the sintered product in a cryogenic treatment device for cold treatment for 1-2 hours at the temperature of-200-120 ℃ to eliminate the internal stress of the product; (6) and (3) placing the product after the cold treatment in a high-temperature tempering furnace for tempering treatment under the environment of 500-750 ℃, so as to improve the toughness of the product.
Abrasion resistance test (test conditions: temperature 600 ℃, rotation speed n =2400r/min, power 200Kw, test time 20 hours, valve seat ring abrasion tester):
valve seat ring material Valve seat ring abrasion loss mm Valve wear capacity mm Total wear rate mm
Reference powder 0.132 0.050 0.182
Example 1 product 0.098 0.040 0.138
EXAMPLE 2 product 0.097 0.040 0.137
EXAMPLE 3 product 0.098 0.040 0.138
It can be easily seen from the above test data that after the hard particles are added, the wear resistance of the valve seat ring products of embodiments 1 to 3 is remarkably improved, and the complex working condition requirements of diesel engines, natural gas engines and other equipment can be met.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. The powder metallurgy seat ring material with hard particles is characterized by comprising the following raw materials in parts by weight: c: 0.6% -1.4%, Cu: 8.0% -22.0%, Cr: 2.8% -6.6%, Si: 0.4% -2.8%, Mo: 7.6% -15.0%, Co: 11.0% -23.0%, W: 1.3% -5.5%, V: 0.8 to 2.7 percent of the total weight of the alloy, and the balance of Fe.
2. The powder metallurgy seat ring material with hard particles of claim 1, wherein: comprises the following raw materials by weight: c: 0.6%, Cu: 8.0%, Cr: 2.8%, Si: 0.4%, Mo: 7.6%, Co: 11.0%, W: 1.3%, V: 0.8 percent and the balance of Fe.
3. The powder metallurgy seat ring material with hard particles of claim 1, wherein: comprises the following raw materials by weight: c: 1.0%, Cu: 15%, Cr: 4.7%, Si: 1.6%, Mo: 11.3%, Co: 17%, W: 3.4%, V: 1.75 percent and the balance of Fe.
4. The powder metallurgy seat ring material with hard particles of claim 1, wherein: comprises the following raw materials by weight: c: 1.4%, Cu: 22.0%, Cr: 6.6%, Si: 2.8%, Mo: 15.0%, Co: 23.0%, W: 5.5%, V: 2.7 percent and the balance of Fe.
CN202011591561.5A 2020-12-29 2020-12-29 Powder metallurgy seat ring material with hard particles Pending CN112593163A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113549845A (en) * 2021-06-29 2021-10-26 安徽森拓新材料有限公司 High-performance powder metallurgy valve seat ring material
CN115821163A (en) * 2021-09-16 2023-03-21 马勒国际有限公司 Layered sintered valve seat insert, method for the production thereof, combination therewith and use thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107385361A (en) * 2017-05-26 2017-11-24 安徽白兔湖粉末冶金有限公司 High temperature wear resistant valve retainer and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107385361A (en) * 2017-05-26 2017-11-24 安徽白兔湖粉末冶金有限公司 High temperature wear resistant valve retainer and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113549845A (en) * 2021-06-29 2021-10-26 安徽森拓新材料有限公司 High-performance powder metallurgy valve seat ring material
CN115821163A (en) * 2021-09-16 2023-03-21 马勒国际有限公司 Layered sintered valve seat insert, method for the production thereof, combination therewith and use thereof
US11959404B2 (en) 2021-09-16 2024-04-16 Mahle International Gmbh Layer sintered valve seat ring, process for its production, combinations therewith and their use

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Application publication date: 20210402