SiO2含量对铜基摩擦材料摩擦行为的影响

来源期刊:中国有色金属学报2009年第10期

论文作者:韩晓明 符蓉 高 飞 宋宝韫 农万华

文章页码:1848 - 1853

关键词:铜基摩擦材料;SiO2;摩擦行为;第三体

Key words:Cu-matrix friction material; SiO2; tribological behavior; third body

摘    要:采用粉末冶金技术制备铜-石墨-SiO2烧结材料,利用销盘式摩擦试验机,在摩擦速度为7.8~47.1 m/s的范围内,研究SiO2在不同摩擦速度条件下的损伤机理及其与材料性能的关系。结果表明:SiO2对材料摩擦磨损性能的影响与摩擦速度密切相关;低摩擦速度条件下,SiO2含量的变化对提高摩擦因数的作用明显,原因在于摩擦力的静载荷性质有利于发挥SiO2粒子的犁沟作用而增加摩擦力;材料的磨损率对SiO2含量不敏感;高摩擦速度条件下,具有冲击作用的摩擦载荷导致SiO2粒子粉碎性破碎,破碎的SiO2粒子弥散嵌入高温软化的基体中而弱化了犁沟作用,导致摩擦因数对SiO2含量的变化不敏感;弥散分布的SiO2粒子强化基体表面强度,导致其磨损率随SiO2含量的增加而降低。

Abstract: To investigate the relationship between dandification mechanism of SiO2 particles and materials performance under different friction speeds, Cu-graphite-SiO2 sintered materials were prepared through powder metallurgy. The tests were conducted on a pin-on-disk tester in speed range of 7.8-47.1 m/s. The results demonstrate that the effects of SiO2 on the friction and wear performance of the materials are closely related to the friction speed. At low friction speed, the friction coefficient increases with increasing content of SiO2 particles, this is attributed to the effect of SiO2 scratch, which can improve the friction force remarkably under static load. However, the wear rate is not sensitive to the content of SiO2 particles. At high friction speed, the SiO2 particles are broken by impact action and embedded in the matrix softened at high temperature, which results in reduction of scratch influence, and makes the friction coefficient insensitive to SiO2 content. The increase of surface hardness causes the wear rate to fall with increasing content of SiO2 particles.

基金信息:国家高技术研究发展计划资助项目
国家自然科学基金资助项目

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