摘要
采用粉末冶金的方法制备一种新型铜基粉末冶金航空刹车材料,研究烧结压力和烧结温度对材料显微组织和致密化的影响以及由此引起的材料摩擦磨损性能和行为的改变。结果表明:当烧结压力由0.5 MPa增加到1.5 MPa时,材料的孔隙度显著减少,材料的摩擦因数明显减小,磨损性能得到显著改善;当烧结压力由1.5 MPa提高到2.5 MPa时,材料的孔隙度进一步降低,但降幅较小,材料磨损性能稍有提高;当烧结压力达到2.5 MPa以后,继续提高烧结压力对材料的致密化程度以及摩擦磨损性能影响不大;当烧结温度由900℃升高到930℃时,材料密度显著增加,材料的磨损性能得到显著改善;当烧结温度由930℃增加至1 000℃时,材料致密化程度进一步增加,但材料的磨损性能变化不大。
The effects of sintering pressure and temperature on microstructures and tribological characteristics of Cu-based aircraft brake materials were investigated. The composites were fabricated by powder metallurgy route and then evaluated using a ring-on-ring friction tester. The resultant mechanisms were discussed by observation and the analysis of microstructures and properties of Cu-based brake materials with various sintering pressures and temperatures. The results show that, at a given sintering temperature, the porosity, wear loss and friction coefficient of composites decrease remarkably as the sintering pressure increases from 0.5 MPa to 1.5 MPa. When the sintering pressure increases from 1.5 MPa to 2.5 MPa, the porosity and wear loss decrease slightly. The increase of sintering pressure hardly has effect on microstructures and tribological characteristics after the sintering pressure reaches 2.5 MPa. Under a given sintering pressure, the sintered density and tribological characteristics improve remarkably as sintering temperature increases from 900℃ to 930 ℃. When the sintering temperature increases from 930 ℃ to 1 000 ℃, the density increases furtherly, but the tribological characteristics changes slightly.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第2期206-212,共7页
Journal of Central South University:Science and Technology
基金
教育部博士点基金资助项目(20050533039)
关键词
摩擦材料
粉末冶金
烧结压力
烧结温度
friction materials
powder metallurgy
sintering pressure
sintering temperature
