Copper-based powder metallurgy friction material and preparation method thereof

A technology of powder metallurgy and friction materials, which is applied in the field of materials, can solve problems such as severe wear, and achieve the effects of reducing wear rate, improving thermal shock resistance, and improving uniformity

Active Publication Date: 2017-05-24
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of automobiles in the direction of high speed and heavy load, the traditional copper-based powder metallurgy friction materials are severely worn during use, which can no longer meet the requirements of the contemporary society for the comprehensive performance of automobile braking materials.

Method used

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  • Copper-based powder metallurgy friction material and preparation method thereof
  • Copper-based powder metallurgy friction material and preparation method thereof
  • Copper-based powder metallurgy friction material and preparation method thereof

Examples

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preparation example Construction

[0031] A preparation method for manufacturing copper-based powder metallurgy friction materials, mixing nano-silicon carbide with industrial alcohol, preferably, performing ultrasonic treatment for 30-35 minutes at a frequency of 20-30KHz, so that nano-silicon carbide is fully dispersed in industrial Alcohol, thus get the first mixed slurry.

[0032] When the raw material contains nano-graphene, preferably, nano-silicon carbide, nano-graphene and industrial alcohol are mixed according to the above ratio, preferably, ultrasonic treatment is carried out for 30-35min at a frequency of 20-30KHz, so that Nano-silicon carbide and nano-graphene are fully dispersed in industrial alcohol to obtain the first mixed slurry.

[0033] Graphite powder, tin powder, iron powder, nickel powder, silicon dioxide, and copper powder are added in the first mixed slurry, preferably, graphite powder, tin powder, iron powder, nickel powder, silicon dioxide, and copper The powder is slowly and uniforml...

Embodiment 1

[0045] A copper-based powder metallurgy friction material, which is sintered from raw materials, specifically, nano-silicon carbide and industrial alcohol are mixed, and ultrasonic treatment is performed for 35 minutes at a frequency of 27KHz to obtain the first mixed slurry; then Graphite powder, tin powder, iron powder, nickel powder, silicon dioxide, and copper powder are added slowly and uniformly into the first mixed slurry at a rate of 1% of their weight per second, under the condition that the ultrasonic frequency is 27KHz Stir for 60 minutes, and the stirring rate is 140r / min. After mixing the raw materials evenly, evaporate and dry at 65°C for 24 hours to obtain a mixed powder; then place the mixed powder under a pressure of 300MPa for 120s for cold pressing to obtain The green compact is placed in a nitrogen atmosphere under the condition of 3MPa, and the temperature is raised from room temperature to 900°C at a constant speed of 10°C / min and kept for 2.5h to sinter t...

Embodiment 2

[0047] A copper-based powder metallurgy friction material, which is sintered from raw materials, specifically, nano-silicon carbide and industrial alcohol are mixed, and ultrasonic treatment is performed for 33 minutes at a frequency of 20KHz to obtain the first mixed slurry; then Graphite powder, tin powder, iron powder, nickel powder, silicon dioxide, and copper powder are respectively added at 1% of their weight per second as the addition amount slowly and uniformly into the first mixed slurry, under the condition that the ultrasonic frequency is 30KHz Stir for 55 minutes, and the stirring rate is 200r / min. After mixing the raw materials evenly, evaporate and dry at 63°C for 24 hours to obtain a mixed powder; then place the mixed powder under a pressure of 350MPa for 130s and perform cold pressing to obtain The green compact is placed in a nitrogen atmosphere under the condition of 4MPa, and the temperature is raised from room temperature at a rate of 12°C / min to 880°C at a ...

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Abstract

The invention relates to a copper-based powder metallurgy friction material and a preparation method thereof, and relates to the technical field of materials. The copper-based powder metallurgy friction material is prepared by sintering raw materials, and comprises the following raw materials in percentage by mass: 6 to 8 percent of tin powder, 3 to 6 percent of iron powder, 4 to 7 percent of nickel powder, 4 to 7 percent of silicon dioxide, 5 to 6 percent of graphite powder, 0.5 to 4 percent of nano silicon carbide, and the balance of copper powder. The wear resistance of the copper-based powder metallurgy friction material is good. The preparation method comprises the following steps: mixing the nano silicon carbide and industrial ethyl alcohol; performing ultrasonic treatment to obtain first mixed slurry; adding the graphite powder, the tin powder, the iron powder, the nickel powder, the silicon carbide and the iron powder into the first mixed slurry; performing ultrasonic treatment and stirring; drying, and pressing the obtain mixed powder through cold pressing; sintering and moulding the obtained press blank; cooling. The strength and the wear resistance of the copper-based powder metallurgy friction material are effectively improved.

Description

technical field [0001] The invention relates to the field of material technology, and in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Background technique [0002] Copper-based powder metallurgy friction material is a composite material prepared by powder metallurgy technology with copper and its alloys as the matrix, adding friction components and lubricating components at the same time. Compared with organic friction materials, this friction material has the advantages of good heat resistance, high mechanical strength, and stable friction and wear performance, so it is widely used in the automotive field. However, with the development of high-speed and heavy-duty automobiles, the traditional copper-based powder metallurgy friction materials are severely worn during use, which can no longer meet the requirements of the contemporary society for the comprehensive performance of automobile braking materials. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22C9/06C22C32/00C22C1/05C22C1/10
CPCC22C1/05C22C9/02C22C9/06C22C32/0005C22C32/0084
Inventor 姚冠新甘贵江奚新国
Owner YANCHENG INST OF TECH
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