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Powder metallurgy brake pad friction material and preparation method thereof

A technology for brake pads and friction materials, which is applied in the field of powder metallurgy materials, can solve the problems of high density and hardness of friction materials, poor stability of friction coefficient, and various alloy components, and achieves low wear, good matching, and improved The effect of antioxidant capacity

Active Publication Date: 2020-08-25
CRRC CHANGZHOU TECH MARK IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the above prior art, it can be seen that the existing powder metallurgy materials have too many types of alloy components in the formula, and the preparation process is complicated, the friction material density and hardness are high, the friction coefficient stability is poor, and the brake disc is greatly damaged. Defects, and some alloy components are precious metals, the production cost is high, and lead powder and other raw material components harmful to the environment and human health will be added to the formula

Method used

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  • Powder metallurgy brake pad friction material and preparation method thereof
  • Powder metallurgy brake pad friction material and preparation method thereof
  • Powder metallurgy brake pad friction material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] The preparation method of the powder metallurgy brake pad friction material of this embodiment includes the following specific steps:

[0037] A. Use an electronic scale to weigh the raw materials. The composition and mass percentage of the raw materials are: copper powder: 56%, chromium-iron alloy powder: 29%, flake graphite: 10%, silicon carbide: 5%. The composition and mass percentage of ferrochrome powder are: chromium: 40%, carbon: 3%, silicon: 1.5%, and the balance is iron.

[0038] B. Use a coulter-type high-speed mixer to fully mix the raw materials. In order to improve the uniformity of the mixing of the materials and prevent the segregation of the raw materials, 0.5% of the total mass of the raw materials is added as a binder during mixing. The mixing time is 30 min.

[0039] C. Use a special powder metallurgy press to press the raw materials into shape. The pressing pressure is 16 MPa.

[0040] D. Adopt a bell-type pressure sintering furnace capable of raising te...

Embodiment 2

[0043] The preparation method of the powder metallurgy brake pad friction material of this embodiment includes the following specific steps:

[0044] A. Use an electronic scale to weigh the raw materials. The components of the raw materials and their mass percentages are: copper powder: 47%, ferrochrome powder: 33%, flake graphite: 15%, silicon carbide: 5%. The composition and mass percentage of ferrochrome powder are: chromium: 35%, carbon: 4%, silicon: 1%, and the balance is iron.

[0045] B. Use a coulter-type high-speed mixer to fully mix the raw materials. The mixing time is 35 min.

[0046] C. Use a special powder metallurgy press to press the raw materials into shape. The pressing pressure is 18 MPa.

[0047] D. Adopt a bell-type pressure sintering furnace capable of raising temperature step by step for pressure sintering. The sintering temperature is 1000℃ and the sintering time is 11h. During sintering, in order to improve the compactness and bonding strength of the mater...

Embodiment 3

[0050] The preparation method of the powder metallurgy brake pad friction material of this embodiment is the same as that of embodiment 1, except for the following:

[0051] In step A, the components of the raw materials and their mass percentages are: copper powder: 50%, ferrochrome powder: 33%, flake graphite: 11%, and silicon carbide: 6%.

[0052] In step B, the adhesive is alcohol which accounts for 0.8% of the total mass of the raw materials.

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Abstract

The invention relates to a powder metallurgy brake pad friction material and a preparation method thereof. The preparation method comprises the following specific steps: (A) raw materials are weighed, and include the following components in percentage by mass: 46-56% of copper, 25-35% of ferrochrome, 8-18% of graphite and 4-7% of silicon carbide; (B) the raw materials are fully mixed; (C) the raw materials are molded by pressing; and the pressing pressure is 15-20 MPa; and (D) the pressurization and the sintering are performed; the sintering temperature is 950-1050 DEG C; the sintering time is 7-15 h; and the sintering pressure is 0.5-3 MPa. The prepared powder metallurgy brake pad friction material is high in purity, excellent in friction performance and lower in cost.

Description

Technical field [0001] The invention relates to a powder metallurgy material for preparing brake pads and a preparation method of the material. Background technique [0002] Powder metallurgy materials, especially copper and iron-based powder metallurgy friction materials, as the key materials for friction and wear parts, are widely used in large transportation vehicles such as trains, airplanes, and tanks. With the rapid development of world railways to high speed and heavy load, higher and higher requirements are put forward for the performance of powder metallurgy materials. [0003] During the braking process of the train, the kinetic energy of the train will be converted into heat energy in a short time and dissipated through the brake discs and brake pads. This is a severe test for the brake pads, and the brake pads are usually It is composed of friction block, metal steel back and dovetail plate. The friction block of the brake pad slides and rubs on the ring of the brake d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C30/02C22C30/00C22C32/00C22C1/05C22C1/10C22C27/06C22C38/34C22C38/02C22C37/10C22C37/06
CPCC22C1/0425C22C1/05C22C1/10C22C9/00C22C27/06C22C30/00C22C30/02C22C32/0063C22C37/06C22C37/10C22C38/02C22C38/34
Inventor 王磊朱松潘祺睿吴射章陈辉钱坤才
Owner CRRC CHANGZHOU TECH MARK IND CO LTD
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