用热爆燃烧合成法结合熔体施压致密化, 制备了相对密度约90%的Cr-(Al, Cr)2O3金属陶瓷, 金属Cr颗粒均匀弥散分布于陶瓷板片间或板片内, 尺寸可达200 nm左右. 研究了金属陶瓷的耐磨性能. 结果表明, 干摩擦条件下, 金属陶瓷具有优良的耐磨性能; 磨损体积与稀释剂Al2O3加入量和过量Cr2O3的含量有关, 两者合理搭配可使Cr-(Al, Cr)2O3的磨损体积小于粉末烧结氧化铝陶瓷的磨损体积.磨损机理主要是块状剥落. 油润滑后, 147 N载荷下,金属陶瓷经6000 m滑动距离仍基本无磨损体积损失;随载荷提高, 磨损体积有所增大, 但仍比Cr12MoV钢小一个数量级以上.
Cr-Al(Cr)2O3 cermets with relative density of about 90% have been successfully produced by thermo-explosive combustion synthesis and pressure on the melt. Cr particles are well-distributed in ceramic plates or boundary between ceramic plates. The size of Cr particles is as small as 200nm. The tribological properties of the cermets were investigated. The results show that the cermets have good wear resistance property under dry sliding. The wear volume of samples is related to addition amount of diluents Al2O3 and excessive Cr2O3. Through rational balance of them, the wear volume of Cr-Al(Cr)2O3 is lower than that of powder sintered alumina ceramic. The main wear mechanism of the cermets is the peeling off under dry sliding. After oil lubrication, there is little wear volume loss in the sample under loading of 147N and 6000m sliding distance. The wear volume of the cermet is increased with loading, but is smaller a order of magnitude than that of Cr12MoV steel.
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