增韧SiC陶瓷在蒸馏水润滑下的摩擦学特性  

TRIBOLOGICAL PROPERTIES OF TOUGHENED SiC CERAMICS UNDER WATER_LUBRICATED SLIDING

作　　者：李剑锋[1] 黄静琪[1] 谭寿洪[1] 陈忠明[1] 丁传贤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所

出　　处：《硅酸盐学报》1998年第3期305-312,共8页Journal of The Chinese Ceramic Society

摘　　要：在ＭＭ－２００块－环接触磨损试验机上，测定了一种增韧ＳｉＣ陶瓷在蒸馏水下自配对、与ＷＣ＋Ｃｏ硬质合金和等离子喷涂Ｃｒ２Ｏ３涂层配对时的磨擦系数和摩损系数；利用ＳＥＭ，ＸＰＳ和ＦＴＩＲ等测试技术，观察和分析了磨痕的形貌和化学组成；讨论了摩擦副材料的显微结构和机械性能对ＳｉＣ陶瓷的摩擦学特性的影响．实验表明：该增韧ＳｉＣ陶瓷在水介质中滑动，ＳｉＣ与水发生化学反应，在磨损表面形成一层由ＳｉＯ２和Ｓｉ（ＯＨ）４组成的表面膜；在ＳｉＣ／ＳｉＣ和ＳｉＣ／Ｃｒ２Ｏ３摩擦副中，ＳｉＣ陶瓷的磨损均主要表现为表面氧化物的不断水解，在磨痕形成超光滑表面，显示出摩损系数小于１０－６ｍｍ３·Ｎ－１·ｍ－１的优异耐磨性能，并在ＳｉＣ／ＳｉＣ摩擦副中实现了摩擦系数为０．０１的流体动压润滑；在ＷＣ＋Ｃｏ／ＳｉＣ摩擦副中，ＳｉＣ陶瓷还表现出微观犁削和微观断裂等磨损机理．The friction and wear performances of toughened silicon carbide(SiC) ceramics against each other, WC+Co hard alloy and plasma_sprayed Cr2O3 coating were investigated with a block_on_ring arrangement under water_lubricated sliding. The morphologies, phases and element valences of the worn surface were observed and examined employing scanning electron microscopy(SEM),X-ray photoelectron spectrometer (XPS) and fourier transform infrared spectroscopy(FTIR) respectively. Furthermore,the effects of microstructure and mechanical properties of friction pair materials on the tribological properties of the SiC ceramics are discussed in the paper. It is found that tribochemical oxidation is taken place and a film consisting of SiO2 and Si(OH)4 is formed on the worn surface of SiC ceramics when it slides in the distilled water. The wear mechanism is explained in term of hydrolysis of the surface film, formation of ultraflat surface on the worn surface,and a wear coefficient less than 10-6mm3·N-1·m-1 is obtained for the SiC ceramics of SiC/SiC and SiC/Cr2O3. Moreover,a friction coefficient of 0.01,which suggests the characterization of hydrodynamic lubrication, is showed for SiC/SiC. In addition, the wear of the SiC ceramics also indicates microcutting and microfracture for WC+Co/SiC.

关 键 词：增韧 碳化硅陶瓷 摩擦学 润滑 陶瓷 蒸馏水 

分 类 号：TQ174.758[化学工程—陶瓷工业]