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Powder metallurgy material for brake pads and preparation method thereof

A powder metallurgy and brake pad technology, applied in the field of powder metallurgy materials for brake pads and their preparation, can solve the problems of poor performance, low quality of brake pads, easy deformation of brake pads, etc., and achieves improved strength and high compression resistance. the effect of strength

Active Publication Date: 2015-03-04
TAIZHOU YOUMIN TRAFFIC EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem to be solved: powder metallurgy materials for brake pads need to have very high hardness and compressive strength, and the quality of brake pads prepared by powder metallurgy materials with lower hardness and lower compressive strength is not high. Brake pads are prone to deformation and other problems during braking. The above-mentioned properties of conventional powder metallurgy materials for brake pads are poor. Therefore, a powder metallurgy material for brake pads with high hardness and compressive strength and its preparation are needed. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) According to the total amount, Si is 3.7wt%, In is 0.2wt%, Sr is 0.5wt%, Pd is 0.2wt%, Ni is 6.5wt%, Ba is 0.7wt%, Cu is 5.5wt%, and the remaining The amount is Fe, and the above-mentioned powdered metal raw materials are mechanically stirred with a mixer, the mechanical stirring speed is 140rpm, and the mechanical stirring time is 40min; (2) After the above-mentioned powdered metal raw materials are stirred evenly, put the powdered metal raw materials into the grinding tank of the ball mill In the process of ball milling powdered metal raw materials, the ball-to-material ratio is 50:1, the speed of the ball mill is 230rpm, and the ball milling time is 2h; (3) Take out the metal material from the ball mill tank in step (2), and then perform cold pressing in the mold , the pressing pressure is 680MPa, and keep it for 40 minutes after the pressing is stable; (4) Sinter the above powder metal billet after cold pressing at high temperature, the heating rate is 45°C / min, ...

Embodiment 2

[0039] (1) According to the total amount, Si is 1.8wt%, In is 0.3wt%, Sr is 0.4wt%, Pd is 0.4wt%, Ni is 4.2wt%, Ba is 1.0wt%, Cu is 4.5wt%, and the remaining The amount is Fe, and the above-mentioned powdered metal raw materials are mechanically stirred with a mixer, the mechanical stirring speed is 140rpm, and the mechanical stirring time is 40min; (2) After the above-mentioned powdered metal raw materials are stirred evenly, put the powdered metal raw materials into the grinding tank of the ball mill In the process of ball milling powdered metal raw materials, the ball-to-material ratio is 50:1, the speed of the ball mill is 230rpm, and the ball milling time is 2h; (3) Take out the metal material from the ball mill tank in step (2), and then perform cold pressing in the mold , the pressing pressure is 680MPa, and keep it for 40 minutes after the pressing is stable; (4) Sinter the above powder metal billet after cold pressing at high temperature, the heating rate is 45°C / min, ...

Embodiment 3

[0041](1) According to the total amount, Si is 3.1wt%, In is 0.3wt%, Sr is 0.4wt%, Pd is 0.3wt%, Ni is 5.5wt%, Ba is 0.8wt%, Cu is 5.1wt%, and the remaining The amount is Fe, and the above-mentioned powdered metal raw materials are mechanically stirred with a mixer, the mechanical stirring speed is 140rpm, and the mechanical stirring time is 40min; (2) After the above-mentioned powdered metal raw materials are stirred evenly, put the powdered metal raw materials into the grinding tank of the ball mill In the process of ball milling powdered metal raw materials, the ball-to-material ratio is 50:1, the speed of the ball mill is 230rpm, and the ball milling time is 2h; (3) Take out the metal material from the ball mill tank in step (2), and then perform cold pressing in the mold , the pressing pressure is 680MPa, and keep it for 40 minutes after the pressing is stable; (4) Sinter the above powder metal billet after cold pressing at high temperature, the heating rate is 45°C / min, w...

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Abstract

The invention belongs to the field of powder metallurgy, and discloses a powder metallurgy material for brake pads and a preparation method thereof. The powder metallurgy material comprises the following raw materials in percentage by weight: 1.5-4.2wt% of Si, 0.1-0.3wt% of In, 0.3-0.6wt% of Sr, 0.2-0.5wt% of Pd, 3.5-7.6wt% of Ni, 0.6-1.1wt% of Ba, 3.3-6.7wt% of Cu and the balance of Fe. The preparation method of the powder metallurgy material comprises the following steps: (1) mechanically stirring the raw materials; (2) performing ball milling on powdered metal raw materials in a milling tank of a ball grinding mill; (3) then performing cold press molding in a mold; and (4) performing high-temperature sintering on powdered metal blanks subjected to cold pressing, and cooling to prepare the powder metallurgy material for the brake pads.

Description

technical field [0001] The invention belongs to the field of metallurgical materials, and relates to a powder metallurgy material and a preparation method thereof, in particular to a powder metallurgy material for brake pads and a preparation method thereof. Background technique [0002] Powder metallurgy material refers to porous, semi-dense or fully dense materials (including products) produced by powder metallurgy. Powder metallurgy materials have unique chemical composition and physical and mechanical properties that cannot be obtained by traditional melting and casting processes, such as controllable porosity of materials, uniform material structure, and no macro segregation (after the alloy is solidified, there is no macroscopic segregation caused by liquid alloy in different parts of the cross-section. Non-uniform chemical composition caused by flow), can be molded at one time, etc. Brake pads, clutch friction plates, porous filters, porous sweating materials, oil-im...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C33/02
CPCC22C33/0207C22C38/002C22C38/02C22C38/08C22C38/16
Inventor 刘莉王爽邱晶
Owner TAIZHOU YOUMIN TRAFFIC EQUIP
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