CN112981270A - High-strength wear-resistant bearing material and preparation method thereof - Google Patents

High-strength wear-resistant bearing material and preparation method thereof Download PDF

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Publication number
CN112981270A
CN112981270A CN201911213738.5A CN201911213738A CN112981270A CN 112981270 A CN112981270 A CN 112981270A CN 201911213738 A CN201911213738 A CN 201911213738A CN 112981270 A CN112981270 A CN 112981270A
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percent
bearing material
resistant bearing
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equal
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易荣东
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Hunan Rongwei Stoker Mfg Co ltd
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Hunan Rongwei Stoker Mfg 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • B22F3/02—Compacting only
    • 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
    • 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
    • B22F3/26—Impregnating
    • 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
    • C22C33/0257—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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/02—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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy

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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)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

The invention discloses a high-strength wear-resistant bearing material which comprises the following components in percentage by weight: 0.5-0.8% of C, Cr: 1.5-1.8%, Mn 3.5-5%, Ce 0.6-0.8%, Se 1.2-1.5%, Cu 5-6%, Zr: 2-3%, Si: 0.4 to 0.6 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities. The high-strength wear-resistant bearing material provided by the invention has the characteristics of high strength, good wear resistance and the like. The invention also provides a preparation method of the high-strength wear-resistant bearing material.

Description

High-strength wear-resistant bearing material and preparation method thereof
Technical Field
The invention relates to the technical field of wear-resistant materials, in particular to a high-strength wear-resistant bearing material and a preparation method thereof.
Background
The sliding bearing is a part commonly used in various machines, the sliding bearing material is required to have sufficient compressive strength and fatigue resistance, good antifriction and wear resistance (the friction coefficient is small), a function of storing lubricating oil and good running-in performance, the iron-based powder metallurgy material is the most commonly used bearing material, according to the technical conditions of sliding bearing powder metallurgy of GB/T-2012 in China, the iron-based bearing material is in a sintered state, the highest crushing strength is FZ12162, the numerical value is K which is not less than 380MPa, the oil content is not less than 12%, the material has low strength and low hardness, so that the bearing is abraded, the service life is short, and the condition that the bearing works under the conditions of low speed, large load and certain impact load cannot be met, such as the bearing for mining machinery.
In view of the above, there is a need to provide a new wear-resistant bearing material to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a high-strength wear-resistant bearing material and a preparation method thereof, and the high-strength wear-resistant bearing material has the characteristics of high strength, good wear resistance and the like.
In order to solve the problems, the technical scheme of the invention is as follows:
a high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.5-0.8% of C, Cr: 1.5-1.8%, Mn 3.5-5%, Ce 0.6-0.8%, Se 1.2-1.5%, Cu 5-6%, Zr: 2-3%, Si: 0.4 to 0.6 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
Preferably, the high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.5% of C, Cr: 1.8%, Mn 5%, Ce 0.8%, Se 1.2%, Cu 6%, Zr: 3%, Si: 0.4 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the high-strength wear-resistant bearing material, which comprises the following steps:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 400-500 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintered material, wherein the sintering temperature is 1360-1380 ℃, and the sintering time is 60-80 min;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 800-850 ℃, the quenching medium is mechanical oil, and then tempering at the temperature of 200-;
and step S5, oil immersion is carried out on the obtained heat-treated product in vacuum, the oil temperature is 80-100 ℃, and the oil immersion time is 60-70 min.
Further, in step S3, the shielding gas is helium.
Further, in step S5, the vacuum degree of the vacuum immersion oil is 6 to 8 Kpa.
The high-strength wear-resistant bearing material and the preparation method thereof have the beneficial effects that: by optimizing the alloy element components, the crystal phase structure is improved, and the crystal grains are refined, so that the hardness, the strength and the wear resistance of the material are improved, and the service life of the bearing is prolonged.
Detailed Description
The following description of the present invention is provided to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above objects, features and advantages of the present invention more comprehensible.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.5-0.8% of C, Cr: 1.5-1.8%, Mn 3.5-5%, Ce 0.6-0.8%, Se 1.2-1.5%, Cu 5-6%, Zr: 2-3%, Si: 0.4 to 0.6 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength wear-resistant bearing material comprises the following steps:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 400-500 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintered material, wherein the sintering temperature is 1360-1380 ℃, and the sintering time is 60-80 min;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 800-850 ℃, the quenching medium is mechanical oil, and then tempering at the temperature of 200-;
and step S5, carrying out vacuum oil immersion on the obtained heat-treated product, wherein the oil temperature is 80-100 ℃, the oil immersion time is 60-70 min, and the vacuum degree of the air vacuum oil immersion is 6-8 Kpa.
The high-strength wear-resistant bearing material of the present invention will be described in detail below with reference to specific examples.
Example 1
A high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.5% of C, Cr: 1.8%, Mn 5%, Ce 0.8%, Se 1.2%, Cu 6%, Zr: 3%, Si: 0.4 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength wear-resistant bearing material comprises the following steps:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 400 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintering material, wherein the sintering temperature is 1360 ℃, the sintering time is 60-80min, and the protective gas is helium;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 800 ℃, the quenching medium is mechanical oil, and then tempering at 200 ℃ for 2-3 h to obtain a heat-treated product;
and step S5, oil dipping the obtained heat-treated product in vacuum at the oil temperature of 80 ℃ for 60-70 min.
Example 2
A high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.8% of C, Cr: 1.5%, Mn 3.5%, Ce 0.6%, Se 1.5%, Cu 5%, Zr: 2%, Si: 0.6 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength wear-resistant bearing material comprises the following steps:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 500 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintered material, wherein the sintering temperature is 1380 ℃, and the sintering time is 60-80min, and the protective gas is helium;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 850 ℃, the quenching medium is mechanical oil, and then tempering at 230 ℃ for 2-3 h to obtain a heat-treated product;
and step S5, oil dipping the obtained heat-treated product in vacuum at the oil temperature of 100 ℃ for 60-70 min.
Example 3
A high-strength wear-resistant bearing material comprises the following components in percentage by weight:
0.6% of C, Cr: 1.6%, Mn: 4%, Ce: 0.7%, Se: 1.4%, Cu: 5.5%, Zr: 2.5%, Si: 0.5 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength wear-resistant bearing material comprises the following steps:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 450 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintering material, wherein the sintering temperature is 1370 ℃, and the sintering time is 60-80min, and the protective gas is helium;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 820 ℃ and the quenching medium is mechanical oil, and then tempering at 220 ℃ for 2-3 h to obtain a heat-treated product;
and step S5, oil dipping the obtained heat-treated product in vacuum at the oil temperature of 90 ℃ for 60-70 min.
The high-strength wear-resistant bearing material provided by the invention has the beneficial effects that: by optimizing the alloy element components, the crystal phase structure is improved, and the crystal grains are refined, so that the hardness, the strength and the wear resistance of the material are improved, and the service life of the bearing is prolonged.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.

Claims (5)

1. The high-strength wear-resistant bearing material is characterized by comprising the following components in percentage by weight:
0.5-0.8% of C, Cr: 1.5-1.8%, Mn 3.5-5%, Ce 0.6-0.8%, Se 1.2-1.5%, Cu 5-6%, Zr: 2-3%, Si: 0.4 to 0.6 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
2. The high strength, wear resistant bearing material of claim 1 comprising in weight percent:
0.5% of C, Cr: 1.8%, Mn 5%, Ce 0.8%, Se 1.2%, Cu 6%, Zr: 3%, Si: 0.4 percent of P, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities.
3. A method for preparing a high-strength wear-resistant bearing material according to claim 1, comprising the steps of:
step S1, preparing raw material powder according to the proportion, mixing the raw material powder by using a mixer for 30-60 min to obtain mixed powder;
step S2, putting the obtained mixed powder into a die to be pressed into a pressed compact, wherein the pressing pressure is 400-500 MPa;
step S3, sintering the pressed compact obtained in the step S2 in a protective atmosphere to obtain a sintered material, wherein the sintering temperature is 1360-1380 ℃, and the sintering time is 60-80 min;
step S4, heating the sintered material in nitrogen, wherein the quenching temperature is 800-850 ℃, the quenching medium is mechanical oil, and then tempering at the temperature of 200-;
and step S5, oil immersion is carried out on the obtained heat-treated product in vacuum, the oil temperature is 80-100 ℃, and the oil immersion time is 60-70 min.
4. The method for preparing a high-strength wear-resistant bearing material according to claim 3, wherein in step S3, the shielding gas is helium.
5. The method for preparing a high-strength wear-resistant bearing material according to claim 3, wherein in step S5, the vacuum degree of the vacuum immersion oil is 6-8 Kpa.
CN201911213738.5A 2019-12-02 2019-12-02 High-strength wear-resistant bearing material and preparation method thereof Withdrawn CN112981270A (en)

Priority Applications (1)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106636918A (en) * 2016-12-08 2017-05-10 绍兴市口福食品有限公司 High-strength and abrasion-resistant bearing material and preparation method thereof
CN109868422A (en) * 2019-03-14 2019-06-11 有研粉末新材料（北京）有限公司 A kind of powder metallurgy firm gear and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106636918A (en) * 2016-12-08 2017-05-10 绍兴市口福食品有限公司 High-strength and abrasion-resistant bearing material and preparation method thereof
CN109868422A (en) * 2019-03-14 2019-06-11 有研粉末新材料（北京）有限公司 A kind of powder metallurgy firm gear and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
沈宁福等: "《新编金属材料手册》", 31 January 2003, 科学出版社 *

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Application publication date: 20210618