摘要
采用滑动磨损实验测试了NiAl-28Cr-5.6Mo-0.25Ho-0.15Hf(原子分数.%)共晶合金与SiC陶瓷配副在600—1000℃下的摩擦磨损特性.结果表明,在700-900℃下合金表现出优异的自润滑耐磨性能,这种特性源于共晶合金摩擦表面生成了1—3μm厚的玻璃陶瓷润滑膜,该润滑膜可向SiC面转移,形成玻璃陶瓷/玻璃陶瓷的摩擦状态.随着温度的升高,共晶合金与润滑膜的强度降低,SiC微粒压入润滑膜,导致润滑膜的剥落加剧、共晶合金磨损率升高.共晶合金在600℃下由于未形成润滑膜而发生较严重的磨粒磨损,摩擦系数和磨损率很高.
The wear behaviors of NiAl-28Cr-5.6Mo-0.25Ho-0.15Hf eutectic alloy against SiC ceramic under dry sliding from 600 to 1000℃were investigated on a pin-on-disc test rig. The results show that the eutectic alloy exhibits excellent self-lubricating properties in the temperature range of 700-900 ℃, which is attributed to the formation of 1-3 μm thick glass-ceramic lubricant film. During wear testing the lubricant film was partially transferred to the SiC counterface, which avoided the direct tribo contact between the alloy and SiC ceramic. At temperatures above 900 ℃ or below 700 ℃ the friction coefficient and wear rate are higher, owing to the adhesion between matrix and film weakening or no film forming.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第3期297-301,共5页
Acta Metallurgica Sinica
