CN112264624A - Powder metallurgy brake pad with low tungsten content and preparation method thereof - Google Patents
Powder metallurgy brake pad with low tungsten content and preparation method thereof Download PDFInfo
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- CN112264624A CN112264624A CN202011050328.6A CN202011050328A CN112264624A CN 112264624 A CN112264624 A CN 112264624A CN 202011050328 A CN202011050328 A CN 202011050328A CN 112264624 A CN112264624 A CN 112264624A
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 24
- 239000010937 tungsten Substances 0.000 title claims abstract description 24
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 24
- 239000010439 graphite Substances 0.000 claims abstract description 24
- 238000005245 sintering Methods 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 10
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 10
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 9
- 229910052786 argon Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 5
- 238000005498 polishing Methods 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 244000137852 Petrea volubilis Species 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 abstract description 3
- 238000011068 loading method Methods 0.000 abstract 1
- 239000011812 mixed powder Substances 0.000 abstract 1
- 229910001018 Cast iron Inorganic materials 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
Abstract
The invention discloses a powder metallurgy brake pad with low tungsten content, which comprises the following components: copper powder; tungsten powder; iron powder; nickel powder; manganese powder; tin powder; titanium powder; titanium oxide; silicon oxide; silicon carbide; graphite; the invention also provides a preparation method of the brake pad, which comprises the steps of weighing the components in percentage by weight, putting the components into a V-shaped mixer, stirring and fully mixing the components; putting the uniformly mixed powder into a die for compression molding; loading the pressed blank into a graphite die, placing the graphite die in a bell-type vacuum sintering furnace, and sintering by using high-purity argon as a protective gas; and after cooling, taking the sample out of the vacuum sintering furnace, leaving a little graphite paper on the surface of the taken sample, and polishing the surface of the sample by using sand paper to obtain the low-tungsten high-friction-performance stable powder metallurgy brake pad. According to the invention, the friction performance stability of the brake pad is high.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a powder metallurgy brake pad with low tungsten content and a preparation method thereof.
Background
The railway brake material has undergone three stages of cast iron, organic synthesis and powder metallurgy since the 20 th century. The main material of the vehicle brake shoe in the early development stage of the electric railway is cast iron, but the general cast iron has small friction coefficient and large abrasion loss, and is easy to generate heat fading at high temperature, so that the friction coefficient is unstable. The performance of the cast iron material is improved by adding phosphorus or less alloy elements into the cast iron, but the problems of large brittleness, high wear rate and the like still exist, and the cast iron material is gradually eliminated in the process of continuously increasing the commercial running speed of the train. Although the organic synthetic brake pad has the advantages of less abrasion loss than cast iron, no spark during braking, light weight and the like, the organic synthetic brake pad has certain limitation in use due to the defects of low mechanical strength, large change of friction coefficient along with temperature and humidity and easy occurrence of cracks. Researchers develop two important friction materials of iron-based and copper-based, and iron-based metallurgical brake pads are not widely applied in practice because of poor corrosion resistance and easy adhesive abrasion with a dual disk.
High-speed rails are rapidly developed in China, China becomes a few countries which master high-speed railway technology all over the world, and the countries have the longest business mileage of the high-speed rails and the highest commercial running speed. The brake pad is one of core technologies of high-speed rails, and the high-performance brake pad cannot be manufactured, so that the high-speed rail cannot be developed. The stable and efficient braking system is the key of train operation, and the performance requirement of the braking pad for the railway is higher and higher along with the rapid development of railway systems in China and the continuous improvement of the running speed of commercial trains. During braking, a large amount of energy can be gathered on the brake pad, and the temperature of the brake pad is quickly increased. In the braking process, the surface temperature of the brake pad of the high-speed train reaches more than 500 ℃, and the instant temperature of emergency braking is even as high as 900 ℃. Tungsten has excellent properties such as high melting point, high thermal conductivity, low expansion coefficient and the like. Therefore, how to apply tungsten to the brake pad and find a preparation method of the brake pad are very worthy of further research and study.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the powder metallurgy brake pad with low tungsten content and the preparation method thereof, so that the friction performance stability of the brake pad is high. To achieve the above objects and other advantages in accordance with the present invention, there is provided a powder metallurgy brake pad with low tungsten content, comprising:
the raw materials comprise the following components in percentage by weight:
copper powder: 40-70 wt%;
iron powder: 0 to 20 weight percent;
tungsten powder: 0 to 10 wt%;
nickel powder: 0 to 10 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 0 to 5 weight percent;
titanium powder: 0 to 10 wt%;
titanium oxide: 0 to 10 wt%;
silicon oxide: 0 to 5 weight percent;
silicon carbide: 0 to 3 wt%;
graphite: 2-10 wt%.
Preferably, the raw materials comprise the following components in percentage by weight:
copper powder: 50-65 wt%;
iron powder: 10-18 wt%;
tungsten powder: 0 to 9 wt%;
nickel powder: 2-8 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 1-3 wt%;
titanium powder: 1-4 wt%;
titanium oxide: 1-5 wt%;
silicon oxide: 0 to 3 wt%;
silicon carbide: 0-2.5 wt%;
graphite: 5-10 wt%.
Preferably, the fineness of the copper powder is 100-300 meshes; the fineness of the iron powder is 200-400 meshes; the fineness of the tungsten powder is 0-200 meshes; the fineness of the nickel powder is 150-300 meshes; the fineness of the manganese powder is 300-400 meshes; the fineness of the tin powder is 150-250 meshes; the fineness of the titanium powder is 300-350 meshes; the fineness of the titanium oxide is 300-375 meshes; the fineness of the silicon oxide is 150-250 meshes; the fineness of the silicon carbide is 180-280 meshes; the fineness of the graphite is 80-150 meshes.
Preferably, the preparation method of the powder metallurgy brake pad with low tungsten content comprises the following steps:
s1, weighing the components according to the weight percentage, putting the components into a V-shaped mixer, stirring and fully mixing;
s2, pre-pressing and forming the mixed ingredients;
s3, cold press molding the pre-pressed molding powder;
s4, carrying out vacuum pressure sintering;
and S5, performing performance test.
Preferably, the step S2 includes: and (5) weighing the raw material powder in the step S1, adding the raw material powder into a mold, and placing the mold under a hydraulic press for mold pressing and preforming.
Preferably, the step S4 includes: and putting the pre-pressed powder blank into a graphite mold, placing the graphite mold in a bell-type vacuum sintering furnace, and sintering for 2-6h at the temperature of 800-1050 ℃ and under the pressure of 0-5MPa by using high-purity argon as a protective gas.
Preferably, the step S4 further includes: and after cooling, taking the sample out of the vacuum sintering furnace, demolding, leaving a little graphite paper on the surface of the taken sample, and polishing the surface of the sample by using sand paper to obtain the powder metallurgy brake pad with low tungsten content, high friction performance and stability.
Compared with the prior art, the invention has the beneficial effects that: the components in the adopted raw materials are conventional products purchased from the market, and the friction performance of the high-speed rail brake pad can be improved by adopting the components.
Drawings
FIG. 1 is a flow chart of the powder metallurgy brake pad with low tungsten content and the preparation method thereof according to 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.
Referring to fig. 1, a powder metallurgy brake pad with low tungsten content comprises:
the raw materials comprise the following components in percentage by weight:
copper powder: 40-70 wt%;
iron powder: 0 to 20 weight percent;
tungsten powder: 0 to 10 wt%;
nickel powder: 0 to 10 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 0 to 5 weight percent;
titanium powder: 0 to 10 wt%;
titanium oxide: 0 to 10 wt%;
silicon oxide: 0 to 5 weight percent;
silicon carbide: 0 to 3 wt%;
graphite: 2-10 wt%.
Further, the raw materials comprise the following components in percentage by weight:
copper powder: 50-65 wt%;
iron powder: 10-18 wt%;
tungsten powder: 0 to 9 wt%;
nickel powder: 2-8 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 1-3 wt%;
titanium powder: 1-4 wt%;
titanium oxide: 1-5 wt%;
silicon oxide: 0 to 3 wt%;
silicon carbide: 0-2.5 wt%;
graphite: 5-10 wt%.
Furthermore, the fineness of the copper powder is 100-300 meshes, and the purity is more than or equal to 99.9 percent; the fineness of the iron powder is 200-400 meshes, and the purity is more than or equal to 99.9 percent; the fineness of the tungsten powder is 0-200 meshes, and the purity is more than or equal to 99.8%; the fineness of the nickel powder is 150-300 meshes; the fineness of the manganese powder is 300-400 meshes, and the purity is more than or equal to 99.8 percent; the fineness of the tin powder is 150-mesh and 250-mesh, and the purity is more than or equal to 99.9 percent; the fineness of the titanium powder is 300-350 meshes, and the purity is more than or equal to 99.8 percent; the fineness of the titanium oxide is 300-375 meshes, and the purity is more than or equal to 99.8 percent; the fineness of the silicon oxide is 150-250 meshes, and the purity is more than or equal to 99.8%; the fineness of the silicon carbide is 180-280 meshes, and the purity is more than or equal to 99.8 percent; the fineness of the graphite is 80-150 meshes, and the purity is more than or equal to 97.0%.
Further, the preparation method of the powder metallurgy brake pad with low tungsten content comprises the following steps:
s1, weighing the components according to the weight percentage, putting the components into a V-shaped mixer, stirring and fully mixing;
s2, pre-pressing and forming the mixed ingredients;
s3, cold press molding the pre-pressed molding powder;
s4, carrying out vacuum pressure sintering;
and S5, performing performance test.
Further, the step S2 includes: and (5) weighing the raw material powder in the step S1, adding the raw material powder into a mold, and placing the mold under a hydraulic press for mold pressing and preforming.
Further, the step S4 includes: and putting the pre-pressed powder blank into a graphite mold, placing the graphite mold in a bell-type vacuum sintering furnace, and sintering for 2-6h at the temperature of 800-1050 ℃ and under the pressure of 0-5MPa by using high-purity argon as a protective gas.
Further, the step S4 further includes: and after cooling, taking the sample out of the vacuum sintering furnace, demolding, leaving a little graphite paper on the surface of the taken sample, and polishing the surface of the sample by using sand paper to obtain the powder metallurgy brake pad with low tungsten content, high friction performance and stability.
Preferably, the mold is manufactured into molds with different sizes and specifications according to different vehicle types.
Preferably, the weighing amount of the raw material powder in the die is 100 +/-2 g.
Preferably, the compression molding conditions are as follows: and (3) mould pressing temperature: 0 to 100 ℃; and (3) mould pressing pressure: 400 +/-20 MPa; and (3) die pressing time: 5 plus or minus 1 min.
Preferably, the pressure-maintaining sintering conditions are as follows: pressure maintaining: 5 +/-2 Mpa; and (3) heat preservation time: 2 +/-1 h.
The principle of the heat treatment is as follows: through high temperature, the stress in the brake pad is eliminated, the surface hardness is improved, and the components are more compact and uniform.
Example 1
Table 1 example 1 formulation
Table 2 example 2 formulation
Table 3 example 3 formulation
Table 4 example 4 formulation
According to the above 4 formulas, the following method is adopted
1) The components are weighed according to the weight percentage and then put into a V-shaped mixer to be stirred and fully mixed.
2) Weighing the raw material powder in the step 1), adding the raw material powder into a mold, putting the mold into a hydraulic press for compression molding, and carrying out pressure maintaining molding;
3) placing the graphite mold in a bell-type hot-pressing sintering furnace, sintering for 2-6h at the temperature of 800 plus 1050 ℃ and under the pressure of 0-5MPa by adopting high-purity argon as a protective gas;
4) after cooling, taking the sample out of the vacuum sintering furnace, leaving a little graphite paper on the surface of the sample, and polishing the surface of the sample by using abrasive paper to obtain the brake pad containing tungsten, high friction performance and stability for the low-speed rail train
TABLE 5 requirements for national Standard Performance index
TABLE 6 data for coefficient of friction measurements
TABLE 7 data for coefficient of friction measurements
Table 8 data for measuring abrasion loss in examples
Table 9 data for abrasion amount measurement of examples
Table 10 example shear strength test data
Table 11 example hardness testing data
The number of devices and the scale of the processes described herein are intended to simplify the description of the invention, and applications, modifications and variations of the invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A powder metallurgy brake pad with low tungsten content, comprising: the raw materials comprise the following components in percentage by weight:
copper powder: 40-70 wt%;
iron powder: 0 to 20 weight percent;
tungsten powder: 0 to 10 wt%;
nickel powder: 0 to 10 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 0 to 5 weight percent;
titanium powder: 0 to 10 wt%;
titanium oxide: 0 to 10 wt%;
silicon oxide: 0 to 5 weight percent;
silicon carbide: 0 to 3 wt%;
graphite: 2-10 wt%.
2. The powder metallurgy brake lining with low tungsten content of claim 1, wherein the raw materials comprise the following components in percentage by weight:
copper powder: 50-65 wt%;
iron powder: 10-18 wt%;
tungsten powder: 0 to 9 wt%;
nickel powder: 2-8 wt%;
manganese powder: 0 to 10 wt%;
tin powder: 1-3 wt%;
titanium powder: 1-4 wt%;
titanium oxide: 1-5 wt%;
silicon oxide: 0 to 3 wt%;
silicon carbide: 0-2.5 wt%;
graphite: 5-10 wt%.
3. The powder metallurgy brake pad with low tungsten content according to claim 1, wherein the fineness of the copper powder is 100-300 meshes; the fineness of the iron powder is 200-400 meshes; the fineness of the tungsten powder is 0-200 meshes; the fineness of the nickel powder is 150-300 meshes; the fineness of the manganese powder is 300-400 meshes; the fineness of the tin powder is 150-250 meshes; the fineness of the titanium powder is 300-350 meshes; the fineness of the titanium oxide is 300-375 meshes; the fineness of the silicon oxide is 150-250 meshes; the fineness of the silicon carbide is 180-280 meshes; the fineness of the graphite is 80-150 meshes.
4. The method for preparing a powder metallurgy brake pad with low tungsten content according to claim 1, comprising the following steps:
s1, weighing the components according to the weight percentage, putting the components into a V-shaped mixer, stirring and fully mixing;
s2, pre-pressing and forming the mixed ingredients;
s3, cold press molding the pre-pressed molding powder;
s4, carrying out vacuum pressure sintering;
and S5, performing performance test.
5. The method for preparing a powder metallurgy brake lining with low tungsten content according to claim 4, wherein the step S2 includes: and (5) weighing the raw material powder in the step S1, adding the raw material powder into a mold, and placing the mold under a hydraulic press for mold pressing and preforming.
6. The method for preparing a powder metallurgy brake lining with low tungsten content according to claim 4, wherein the step S4 includes: and putting the pre-pressed powder blank into a graphite mold, placing the graphite mold in a bell-type vacuum sintering furnace, and sintering for 2-6h at the temperature of 800-1050 ℃ and under the pressure of 0-5MPa by using high-purity argon as a protective gas.
7. The method for preparing a powder metallurgy brake lining with low tungsten content according to claim 6, wherein the step S4 further comprises: and after cooling, taking the sample out of the vacuum sintering furnace, demolding, leaving a little graphite paper on the surface of the taken sample, and polishing the surface of the sample by using sand paper to obtain the powder metallurgy brake pad with low tungsten content, high friction performance and stability.
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