超细ATC陶瓷制备及其干滑动磨损研究

为提高陶瓷刀具材料的耐磨性能和断裂韧性，制备新型超细Al2O3-TiC-8%Co（ATC）陶瓷样品.采用低温化学镀方法对亚微米级Al2O3和TiC粉末表面进行金属钴包覆，热压烧结复合粉体制备该ATC样品.在销盘式磨损试验机上对ATC陶瓷的耐磨性能进行考察，采用SEM对ATC陶瓷的磨损形貌进行分析.结果表明，干滑动摩擦条件下，断裂韧性对陶瓷材料耐磨性能的影响非常明显.各摩擦副磨损过程中，随磨损时间延长ATC陶瓷样品表面微细突起脱落，磨损面趋于平滑，相对磨损率降低.金属钴的独特复合方式抑制了烧结过程中晶粒长大,并增大ATC陶瓷的断裂韧性和耐磨性能.

Preparation of ultra-fine ATC ceramics and analysis of its dry-sliding wear behavior

To improve the wear resistance and fracture toughness of ceramic-tools material,the ultra-fine Al_2O_3-TiC-8%Co(ATC) ceramics were prepared.Cobalt was coated on the surface of the sub-micron Al_2O_3 and TiC particles by low temperature electroless plating,and then the composite powders were sintered into the ATC samples.The wear resistance of ATC ceramics was investigated by the pin-on-disc wear device,and the worn surface morphologies were examined by scanning electron microscopy(SEM).The results show that the effect of the fracture toughness on the wear resistance of ceramic materials is very obvious and the particle spalling predominates during the dry sliding wear process.With the increasing test time,the worn surface of ATC ceramic becomes smooth and the relative wear rate decreases during the wear processes.Cobalt coated on ultra-fine Al_2O_3 and TiC can depress the grain growth during the sintering process,and consequently improve the fracture toughness and wear resistance of ATC ceramics.