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Powder metallurgy brake lining for high speed train and preparing method thereof

A high-speed train, powder metallurgy technology, applied in metal processing equipment, chemical instruments and methods, mechanical equipment, etc., can solve the problems of low friction coefficient and poor thermal stability of synthetic brake pads, and achieve high friction coefficient, long service life, smooth braking effect

Inactive Publication Date: 2017-01-25
贵州新安航空机械有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a powder metallurgy brake pad for high-speed trains and its preparation method, which overcomes the problems of poor thermal stability and low friction coefficient of synthetic brake pads at high temperatures, and improves the wear resistance of the brake pads. loss of performance

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  • Powder metallurgy brake lining for high speed train and preparing method thereof

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preparation example Construction

[0030] A method for preparing a powder metallurgy brake pad for a high-speed train, comprising the steps of:

[0031] (1) Raw material treatment: Copper powder and iron powder are subjected to reduction treatment. The reduction temperature of copper powder is 400-450°C, and the reduction temperature of iron powder is 600-700°C. After 3 hours of heat preservation in the environment of ammonia decomposition gas, it is air-cooled to Room temperature; graphite, silicon carbide, quartz sand, and molybdenum disulfide need to be dried at a temperature of 150-200°C, kept warm for 3 hours, then cooled with the furnace, and treated at a constant temperature at 20-60°C; after the above reduction Copper powder and iron powder must be sieved through a standard sieve of corresponding particle size;

[0032] (2) Ingredients: the raw materials processed in step (1) are weighed according to the component ratio of the brake block;

[0033] (3) Mixing: put the processed raw materials in step (2...

Embodiment 1

[0040]A powder metallurgy brake pad for high-speed trains, the formula of the friction body material is calculated in parts by weight: copper powder 70, iron powder 3, graphite 10, silicon carbide 5, quartz sand 2, nickel powder 0.5, tungsten carbide 1, molybdenum oxide 2. Zircon 4. Tin powder 2. Boron nitride 2.

[0041] The microphysical properties of the above components are: iron powder purity ≥ 98%, particle size 20-75μm, spongy; copper powder purity ≥ 99.5%, particle size 20-75μm, dendritic; graphite purity ≥ 92%, particle size 20~40μm, granular; silicon carbide purity ≥97%, particle size 50~63μm; quartz sand purity ≥97%, particle size 40#~100#; nickel powder purity ≥99.5%, particle size 20~63μm, branch shape; tungsten carbide purity ≥99.5%, gray powder; molybdenum oxide purity ≥98%, particle size 20-45μm, layered powder. Zircon purity ZrO 2 ≥66%, brown polyhedron; tin powder purity Sn≥99.5%, powder; boron nitride purity BN≥98%, hexagonal crystal.

[0042] The above-m...

Embodiment 2

[0052] A powder metallurgy brake pad for high-speed trains, the formula of the friction body material is calculated in parts by weight: copper powder 50, iron powder 3.5, graphite 11, silicon carbide 10, quartz sand 6, nickel powder 3, tungsten carbide 7, molybdenum oxide 2. Zircon 1, tin powder 6, boron nitride 0.5.

[0053] The microphysical properties of the above components are: iron powder purity ≥ 98%, particle size 20-75μm, spongy; copper powder purity ≥ 99.5%, particle size 20-75μm, dendritic; graphite purity ≥ 92%, particle size 20~40μm, granular; silicon carbide purity ≥97%, particle size 50~63μm; quartz sand purity ≥97%, particle size 40#~100#; nickel powder purity ≥99.5%, particle size 20~63μm, branch shape; tungsten carbide purity ≥99.5%, gray powder; molybdenum oxide purity ≥98%, particle size 20-45μm, layered powder. Zircon purity ZrO 2 ≥66%, brown polyhedron; tin powder purity Sn≥99.5%, powder; boron nitride purity BN≥98%, hexagonal crystal.

[0054] The abo...

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Abstract

The invention discloses a powder metallurgy brake lining fora high speed train and a preparing method thereof, belonging to the technical field of a brake. The preparing method comprises the steps of raw material treating, burdening, mixing, compression moulding, molding and sintering, machining, rivet processing and so on. The power is prepared from, by weight, 50-70 parts of copper powder, 3-10 parts of iron powder, 10-20 parts of graphite, 5-10 parts of silicon carbide, 2-6 parts of quartz sand, 0.5-3 parts of nickel powder, 1-7 parts of tungsten carbide, 0.5-2 parts of molybdenum oxide, 1-4 parts of zirconite, 2-6 parts of tin powder and 0.5-2 parts of boron nitride. The technical scheme takes the copper as the base component; the base is reinforced by adding iron powder, nickel powder, tin powder and the like; the friction coefficient of the car brake block is increased by adding silicon carbide, zirconite, quartz sand and the like, and the brake pad with stable brake, log service life and capability of meeting the brake requirement of the high-speed train.

Description

technical field [0001] The invention belongs to the technical field of brakes, and relates to a brake pad, in particular to a powder metallurgy brake pad for high-speed trains and a preparation method thereof. Background technique [0002] In recent years, with the strengthening of my country's train development trend towards high speed, the development of brake pads, one of its consumable parts, has become one of the key technologies for localization. When a high-speed train brakes, most of its kinetic energy is converted into heat energy, making the friction surface temperature of the brake pads and brake discs as high as 500 °C, and the local flash point temperature can reach 1000 °C. In the process of high-speed braking, the brake pads have to bear greater shear force, higher temperature and pressure, which puts forward high requirements on the performance of the brake pads. [0003] At present, the resin synthetic brake pads used for high-speed train braking have low t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D69/02C09K3/14B22F1/00B22F3/10B22F3/14
CPCF16D69/02F16D69/027C09K3/149B22F3/1007B22F3/14F16D2200/0026F16D2200/0086F16D2200/0082B22F1/10
Inventor 邱红
Owner 贵州新安航空机械有限责任公司
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