CN112831685A - Motor train unit brake pad friction material and preparation method thereof - Google Patents
Motor train unit brake pad friction material and preparation method thereof Download PDFInfo
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- CN112831685A CN112831685A CN202011631678.1A CN202011631678A CN112831685A CN 112831685 A CN112831685 A CN 112831685A CN 202011631678 A CN202011631678 A CN 202011631678A CN 112831685 A CN112831685 A CN 112831685A
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- friction material
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- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
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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)
- Powder Metallurgy (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a friction material for a brake pad of a motor train unit and a preparation method thereof, wherein the friction material for the brake pad is prepared from the following raw materials in parts by weight: copper powder, iron powder, Fe3Al, silicon carbide powder, graphite, ferrochromium powder, fumed silica and molybdenum disulfide powder, proportionally placing the raw materials into a three-dimensional mixer, placing the uniformly mixed powder into a cold pressing die for pressing to obtain a pressed blank, fixing the pressed blank on a steel backing, and pushing the pressed blank and the steel backing into hydrogen togetherAnd (3) pressurizing and sintering in a gas sintering furnace to obtain the brake pad friction material. The friction material of the invention improves the high-temperature strength and the oxidation resistance of the brake pad, solves the problem of the strength reduction of the brake pad friction block caused by high braking temperature, and effectively improves the stability of the friction coefficient at high temperature.
Description
Technical Field
The invention relates to the technical field of powder metallurgy materials, in particular to a friction material for a brake pad of a motor train unit and a preparation method thereof.
Background
In recent years, high-speed rails in China are rapidly developing, faster and higher requirements are put forward for railway transportation departments in China, and although electric and dynamic braking play more and more important roles in braking high-speed trains, the international railway alliance UIC still stipulates that: in the event of other brake failures, mechanical friction brakes must ensure that the high speed train can stop within a specified distance to ensure safe train operation.
The brake pad is a key part of a high-speed train braking system, and the kinetic energy of the train is converted into frictional heat energy through the friction between the brake pad friction block and the disc surface of the brake disc, so that the train is decelerated and finally stopped. And the increase of the train running speed puts higher requirements on the brake pad friction block material. The higher the running speed of the train is, the higher the friction heat generated by a brake friction pair is, the higher the requirements on the high heat load resistance and the brake friction and wear resistance of brake pad friction block materials are, and the traditional resin-based friction materials and synthetic materials can not bear the harsh working conditions. At present, the metal-based composite material friction plate prepared by a powder metallurgy method is generally adopted, and has the advantages of good heat-conducting property, low temperature rise of a friction pair, high allowable temperature and the like. The powder metallurgy braking material has higher use temperature, can still keep smaller wear rate and better friction characteristic when the braking temperature reaches 500 ℃, has smaller heat influence on a brake disc, and can ensure the safe operation of a train under the severe weather condition. However, in recent years, with the further speeding of trains, the instantaneous maximum temperature on the friction surface of a high-speed train with the speed of 350km/h during braking may exceed 900 ℃, and the problems of block falling, cracking, unstable friction coefficient and the like of a friction material are easy to occur at high temperature.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a friction material for a brake pad of a motor train unit and a preparation method thereof, which increase the high-temperature strength and the oxidation resistance of the brake pad, solve the problem of strength reduction of the friction block of the brake pad caused by temperature rise during braking, and effectively improve the stability of the friction coefficient at high temperature.
The invention is realized by adopting the following technical scheme:
the invention relates to a brake pad friction block of a motor train unit, which is prepared from the following raw materials in parts by weight:
the friction material for the brake pad of the motor train unit comprises the following raw materials in parts by weight:
30-70 parts of copper powder, 10-25 parts of iron powder and Fe31-25 parts of Al, 0-15 parts of silicon carbide powder, 4-16 parts of graphite, 0-10 parts of ferrochrome powder, 1-5 parts of fumed silica and 0-6 parts of molybdenum disulfide powder.
Preferably, the brake pad friction material is prepared from the following raw materials in parts by weight:
40-60 parts of copper powder, 10-20 parts of iron powder and Fe35-20 parts of Al, 2-10 parts of silicon carbide powder, 5-12 parts of graphite, 2-8 parts of ferrochrome powder, 1-3 parts of fumed silica and 1-6 parts of molybdenum disulfide powder.
Preferably, the brake pad friction block material comprises the following raw materials in parts by weight:
copper powder 52, iron powder 10, Fe3Al 12, silicon carbide powder 7, graphite 6, ferrochrome powder 5, fumed silica 3 and molybdenum disulfide powder 5.
Preferably, the average primary particle size of the fumed silica is 1-100 nm, and the preparation method is a chemical vapor deposition method.
Preferably, the friction material for the brake pads of the motor train unit is Fe3The mesh number of the Al powder is 40-400 meshes.
A method for preparing the friction material for the brake pad of the motor train unit as claimed in claim 1, comprising the following steps:
a. preparing materials: weighing the raw materials by using weighing equipment according to the weight part ratio;
b. mixing materials: putting into three-dimensional compounding machine with above-mentioned raw and other materials, adding paraffin, the stirring, it is 2 ~ 4h long for the compounding, wherein, the ratio of paraffin addition and raw materials total weight is 1 ml: 200g of the total weight of the mixture;
c. pressing: cold-press molding the uniformly mixed raw materials to obtain a friction material blank, wherein the cold-press molding pressing pressure is 100-1500 Mpa;
d. and (3) sintering: and (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace, wherein the sintering pressure is 2-6 Mpa, the sintering temperature is 800-1000 ℃, and the heat preservation time is 1-3 hours, so as to obtain the friction material for the brake pad of the motor train unit.
Preferably, in the preparation method of the friction material for the brake pad of the motor train unit, the pressing pressure of the cold-pressed friction material blank is 100-1000 Mpa.
Preferably, in the preparation method of the friction material for the brake pad of the motor train unit, the pressing pressure of the cold-pressed friction material blank is 700 Mpa.
Preferably, in the preparation method of the friction material for the brake pad of the motor train unit, the sintering pressure in the step d is 3 Mpa.
Preferably, in the preparation method of the friction material for the brake pad of the motor train unit, the sintering temperature in the step d is 850 ℃.
Preferably, in the preparation method of the friction material for the brake pad of the motor train unit, the heat preservation time of the sintered compact is 2 hours.
Compared with the prior art, the invention has the following remarkable effects:
the invention uses Fe3Al powder and fumed silica, Fe3The Al intermetallic compound has a superlattice crystal structure, and the bonding among atoms has not only metallic bonds but also covalent bonds and ionic bonds, so that Fe3Oxidation resistance, sulfidability, high temperature strength, high temperature creep property of AlAnd the wear resistance is superior to most metal materials, the thermal conductivity and the plasticity are between those of alloy and ceramic, and in addition, the material also has good performances of resisting adhesive wear, abrasive wear and corrosion wear at high temperature. The fumed silica has dispersion strengthening effect as the nano reinforcing phase, and can effectively improve the physical, mechanical and tribological properties of the composite material. In the copper-based powder metallurgy friction material, the addition of the fumed silica can improve the high-temperature strength and hardness of the copper-based composite material, reduce the attenuation of the dynamic friction factor and further reduce the abrasion of an abrasive. The invention provides a friction material for a brake pad, which increases the high-temperature strength and oxidation resistance of the brake pad, well solves the problem of strength reduction of a friction block of the brake pad caused by temperature rise during braking, and effectively improves the stability of the friction coefficient at high temperature.
Detailed Description
The technical solution of the present invention is clearly and completely described below.
Example 1:
taking 52 kg of copper powder, 10 kg of iron powder and Fe312 kg of Al, 7 kg of silicon carbide powder, 6 kg of graphite, 5 kg of ferrochrome powder, 3 kg of gas-phase silicon dioxide and 5 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 700 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 3Mpa and the sintering temperature of 850 ℃ for 2 hours to obtain the powder metallurgy brake pad friction material.
Example 2:
taking 48 kg of copper powder, 11 kg of iron powder and Fe316 kg of Al, 7 kg of silicon carbide powder, 6 kg of graphite, 6 kg of ferrochrome powder, 2 kg of gas-phase silicon dioxide and 4 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Will be provided withPutting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 1000 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 6Mpa and the sintering temperature of 920 ℃ for 3 hours to obtain the powder metallurgy brake pad friction material.
Example 3:
taking 55 kg of copper powder, 10 kg of iron powder and Fe310 kg of Al, 5 kg of silicon carbide powder, 5 kg of graphite, 6 kg of ferrochrome powder, 5 kg of gas-phase silicon dioxide and 4 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 900 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 2Mpa and the sintering temperature of 850 ℃ for 1 hour to obtain the powder metallurgy brake pad friction material.
Example 4:
taking 58 kg of copper powder, 10 kg of iron powder and Fe312 kg of Al, 5 kg of silicon carbide powder, 5 kg of graphite, 4 kg of ferrochrome powder, 1 kg of fumed silica and 5 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 600 Mpa. Placing the steel backing on a friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 3Mpa and the sintering temperature of 890 ℃ for 1.5 hours to obtain the productTo powder metallurgy brake pad friction materials.
Example 5:
taking 46 kg of copper powder, 14 kg of iron powder and Fe315 kg of Al, 8 kg of silicon carbide powder, 7 kg of graphite, 4 kg of ferrochrome powder, 3 kg of fumed silica and 3 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 100 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 5Mpa and the sintering temperature of 860 ℃ for 1.5 hours to obtain the powder metallurgy brake pad friction material.
Example 6:
taking 42 kg of copper powder, 15 kg of iron powder and Fe316 kg of Al, 8 kg of silicon carbide powder, 7 kg of graphite, 4 kg of ferrochrome powder, 2 kg of gas-phase silicon dioxide and 6 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly, wherein the mixing time is 2-4h, and the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 400 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace at the sintering pressure of 4Mpa and the sintering temperature of 950 ℃ for 2.5 hours to obtain the powder metallurgy brake pad friction material.
Example 7:
taking 52 kg of copper powder, 10 kg of iron powder and Fe313 kg of Al, 7 kg of silicon carbide powder, 8 kg of graphite, 5 kg of ferrochrome powder, 1 kg of gas-phase silicon dioxide and 4 kg of molybdenum disulfide powder. And weighing the raw materials by using weighing equipment according to the weight part ratio. Putting the raw materials into a three-dimensional mixer, adding paraffin, stirring uniformly,the mixing time is 2-4h, wherein the ratio of the addition amount of the paraffin to the total weight of the raw materials is 1 ml: 200 g. And (3) cold-pressing and molding the uniformly mixed raw materials to obtain the cold-pressed and molded friction material, wherein the pressing pressure of the cold-pressing and molding is 500 Mpa. And (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace, wherein the sintering pressure is 3Mpa, the sintering temperature is 890 ℃, and the heat preservation time is 2 hours, so as to obtain the powder metallurgy brake pad friction material.
Claims (10)
1. The friction material for the brake pad of the motor train unit is characterized by comprising the following raw materials in parts by weight:
30-70 parts of copper powder, 10-25 parts of iron powder and Fe31-25 parts of Al, 0-15 parts of silicon carbide powder, 4-16 parts of graphite, 0-10 parts of ferrochrome powder, 1-5 parts of fumed silica and 0-6 parts of molybdenum disulfide powder.
2. The brake pad friction material for the motor train unit as claimed in claim 1, wherein the brake pad friction material is composed of the following raw materials in parts by weight:
40-60 parts of copper powder, 10-20 parts of iron powder and Fe35-20 parts of Al, 2-10 parts of silicon carbide powder, 5-12 parts of graphite, 2-8 parts of ferrochrome powder, 1-3 parts of fumed silica and 1-6 parts of molybdenum disulfide powder.
3. The friction material for the brake pads of the motor train unit as claimed in claim 1, wherein the fumed silica has an average primary particle size of 1-100 nm and is prepared by a chemical vapor deposition method.
4. The friction material for brake pads of motor train units according to claim 1, wherein the Fe is Fe3The mesh number of the Al powder is 40-400 meshes.
5. The method for preparing the friction material for the brake pad of the motor train unit as claimed in claim 1 is characterized by comprising the following steps:
a. preparing materials: weighing the raw materials by using weighing equipment according to the weight part ratio;
b. mixing materials: putting into three-dimensional compounding machine with above-mentioned raw and other materials, adding paraffin, the stirring, it is 2 ~ 4h long for the compounding, wherein, the ratio of paraffin addition and raw materials total weight is 1 ml: 200g of the total weight of the mixture;
c. pressing: cold-press molding the uniformly mixed raw materials to obtain a friction material blank, wherein the cold-press molding pressing pressure is 100-1500 Mpa;
d. and (3) sintering: and (3) placing the steel backing on the friction material blank formed by cold pressing, and performing pressure sintering in a hydrogen sintering furnace, wherein the sintering pressure is 2-6 Mpa, the sintering temperature is 800-1000 ℃, and the heat preservation time is 1-3 hours, so as to obtain the friction material for the brake pad of the motor train unit.
6. The preparation method of the friction material for the brake pad of the motor train unit as claimed in claim 5, wherein the pressing pressure of the cold-pressed friction material blank is 100-1000 MPa.
7. The method for preparing a friction material for a brake pad of a motor train unit as claimed in claim 6, wherein the pressing pressure of the green compact is 700 Mpa.
8. The method for preparing a friction material for a brake pad of a motor train unit as claimed in claim 5, wherein the sintering pressure in step d is 3 MPa.
9. The method for preparing a friction material for a brake pad of a motor train unit as claimed in claim 5, wherein the sintering temperature in the step d is 850 ℃.
10. The method for preparing the friction material of the brake pad of the motor train unit as claimed in claim 5, wherein the heat preservation time of the sintered compact is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011631678.1A CN112831685A (en) | 2020-12-31 | 2020-12-31 | Motor train unit brake pad friction material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011631678.1A CN112831685A (en) | 2020-12-31 | 2020-12-31 | Motor train unit brake pad friction material and preparation method thereof |
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| CN112831685A true CN112831685A (en) | 2021-05-25 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09301256A (en) * | 1996-05-09 | 1997-11-25 | Toshiba Tungaloy Co Ltd | Roller brake for vehicle |
| CN103115097A (en) * | 2013-02-05 | 2013-05-22 | 博深工具股份有限公司 | Friction block of brake block of high speed train and preparation method thereof |
| CN107058790A (en) * | 2017-04-05 | 2017-08-18 | 中国铁道科学研究院金属及化学研究所 | A kind of enhanced powder metallurgy friction material of intermetallic compound and its production and use |
| CN108118181A (en) * | 2017-12-29 | 2018-06-05 | 东南大学 | A kind of copper-base powder metallurgy brake pad material and its preparation method and application |
-
2020
- 2020-12-31 CN CN202011631678.1A patent/CN112831685A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09301256A (en) * | 1996-05-09 | 1997-11-25 | Toshiba Tungaloy Co Ltd | Roller brake for vehicle |
| CN103115097A (en) * | 2013-02-05 | 2013-05-22 | 博深工具股份有限公司 | Friction block of brake block of high speed train and preparation method thereof |
| CN107058790A (en) * | 2017-04-05 | 2017-08-18 | 中国铁道科学研究院金属及化学研究所 | A kind of enhanced powder metallurgy friction material of intermetallic compound and its production and use |
| CN108118181A (en) * | 2017-12-29 | 2018-06-05 | 东南大学 | A kind of copper-base powder metallurgy brake pad material and its preparation method and application |
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Application publication date: 20210525 |