Ni-Cr/BN自润滑材料摩擦磨损机理分析  

Analyses of Frictional Wear Mechanics of Ni-Cr/BN Self-Lubricating Composites

作　　者：冯艳[1] 王日初[1] 余琨[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《稀有金属材料与工程》2007年第10期1820-1823,共4页Rare Metal Materials and Engineering

摘　　要：采用粉末冶金热压方法制备了不同BN含量的Ni-20Cr自润滑材料,用扫描电镜和金相显微镜观察了磨损表面和断口形貌,研究了不同热压温度、不同BN含量对材料力学和摩擦学性能的影响。研究结果表明:随着温度的升高,Ni-Cr/BN固体自润滑材料的孔隙率减少,力学和摩擦学性能增强;Ni-Cr/10%BN摩擦性能比Ni-Cr/11%BN差的原因可能是BN含量的减少使摩擦表面不能形成连续的润滑膜或者润滑膜在摩擦时剥落后不能及时补充,使平均摩擦系数和磨损量增加。The nickel based self-lubricating materials containing different contents of BN were prepared by not-pressing technology of powder metallurgy. The morphologies of worn surfaces and the fracture were analyzed by scanning electron microscopy and metallurgical microscope. The influences of different hot-pressing temperature and contents of BN on mechanical and tribological properties of the material were studied. The results showed that increasing of hot-pressing temperature leaded to good mechanical properties and tribological properties of material as well as the decreasing of porosity. The Ni-Cr/10%BN had worse tribological properties compared with Ni-Cr/11%BN because decreasing of content of BN cannot form continuous lubricating film on the friction surface or the flaking lubricating film can not be supplied on time.

关 键 词：自润滑 BN Ni—Cr合金 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]