四方氧化锆多晶/氧化铝(板晶)复相陶瓷的摩擦磨损性能研究  

Friction and Wear Characteristics of Y-TZP/Alumina (Platelet) Composites

作　　者：周振君[1] 郭艳杰[1] 杨正方[2] 

机构地区：[1]长安大学地球科学与国土资源学院,陕西西安710054 [2]天津大学材料科学与工程学院,天津300072

出　　处：《摩擦学学报》2007年第2期166-171,共6页Tribology

基　　金：教育部科学技术重点项目资助(106151);国家863计划资助项目(2002A33082)

摘　　要：以表面包裹玻璃涂层的氧化铝微粉、小尺寸样板晶以及钇稳定四方氧化锆（Y—TZP）微粉为原料，在常压下通过样板晶生长制备氧化铝样板晶体积分数为50％的Y—TZP／板状氧化铝复相陶瓷，采用机油为润滑剂对比研究了复相陶瓷和3Y—TZP陶瓷在不同载荷下的摩擦磨损性能，采用扫描电子显微镜和X射线衍射仪观察分析试样磨损表面形貌及其相组成．结果表明，在载荷400N时，3Y—TZP陶瓷出现摩擦系数和磨损率突变．在磨损突变前，3Y—TZP陶瓷的磨损机理为塑性变形、耕犁和微裂纹，在磨损突变后则以微断裂和晶粒拔出为主．复相陶瓷在试验载荷（100—700N）条件下没有出现磨损突变．与3Y-TZP陶瓷相比，在相同载荷下，复相陶瓷的磨损率较低．这是因为复相陶瓷中的氧化铝板晶在三维空间形成了网络骨架，氧化铝样板晶固有的高弹性模量和高热导率抑制了氧化锆马氏体相变，为摩擦热的散失提供了导热通道．Using alumina platelets and powders coated with 3 wt% CaO2 · SiO2 glass and yttria-stabilized zirconia （3Y-TZP） powders as starting materials, Y-TZP/platelet-alumina composites with up to 50 vol% a-Al2O3 platelets were prepared in atmospheric pressure by templated grain growth. The friction and wear behavior of the composites and yttria-stabilized zirconia ceramic （3Y-TZP） sliding against a high-chromium cast iron were comparatively investigated in oil at varying loads on an MM-200 test rig in a block-on-ring configuration. The micrograph and phase composition of worn specimens were analyzed by means of scanning electron microscopy and X-ray diffraction. The results show that wear of 3Y-TZP has a transition at 400 N load, accompanied by the abrupt change of friction coefficient and wear rate. The main wear mechanisms are plastic deformation, ploughing and microcracks before wear fransition, and microfracture and grains pull-out after wear fransition. Compared with 3Y-TZP, the composite exhibited low wear rate and no wear transition at applied loads between 100 and 700 N. No large crack is observed on the worn surfaces of the composite even at high load. Alumina platelets with intrinsically high Young＇s modulus and high thermal conductivity formed a 3-dimensional network, and it inhibited t→m phase transformation of zirconia and so they promoted of friction heat of the composite materials.

关 键 词：四方氧化锆多晶/氧化铝(板晶)复相陶瓷 Y—TZP 摩擦磨损性能 

分 类 号：TQ174.758.12[化学工程—陶瓷工业] TH117.3[化学工程—硅酸盐工业]