不同配副下ZrB2-SiC复相陶瓷的摩擦学性能

以微米级ZrB_2和SiC粉末为原料,采用热压烧结制备ZrB_2-SiC复相陶瓷,考察了SiC含量,摩擦对偶,速度和载荷对ZrB_2-SiC复相陶瓷摩擦磨损特性的影响.结果表明:ZrB_2-SiC复相陶瓷的摩擦系数和磨损率对SiC含量和摩擦对偶的变化较为敏感,速度和载荷变化,摩擦系数和磨损率的波动较大;以WC为对偶,速度0.1 m/s,载荷5 N时的ZrB_2-SiC复相陶瓷的平均摩擦系数和磨损率分别仅为0.4和2.41×10–4 mm3/(N·m).ZrB_2-SiC复相陶瓷的磨损机制以机械磨损为主,伴有轻微摩擦氧化,摩擦层的形成有利于摩擦系数的减小.

Influences of Velocity, Load and Counterpart Material on the Tribological Behavior of ZrB2-SiC Composites

ZrB₂-SiC composites were prepared by hot-pressing using micron-sized ZrB₂ and SiC powders as raw materials. The influences of mated material, velocity and load on the friction and wear properties of the composites were investigated. The results show that the composites exhibited different tribological behavior in sliding against WC-Co, SiC, Al₂O₃ and GCr15. The friction coefficient and specific wear rates of the composites were dependent on velocity and load. In sliding against WC-Co at 0.1 m/s and 5 N, the average friction coefficient and specific wear rates were 0.4 and 2.41×10^-4 mm³/(N·m), respectively. The wear mechanism of the composites was mainly mechanical wear with mild tribo-oxidation wear, and the formation of tribofilm was benefit for the reduction of friction.