作　　者： ; ;

机构地区： 湖南大学材料科学与工程学院

出　　处： 《中国陶瓷工业》 2004年第6期10-15,共6页

摘　　要： 研究了SiC及其复相陶瓷从室温到1200℃的高温摩擦学性能。随着试验温度的升高,SiC/SiC的高温摩擦系数变化不大,比磨损率呈现出不变(Ⅰ)、增加(Ⅱ)和减小(Ⅲ)三种模式;SiC-TiC和SiC-WC自对偶的高温摩擦系数和比磨损率很小,摩擦系数从400℃开始减小;在高温磨损中,自对偶的磨损机理由轻微的粘着磨损控制,磨损由模式Ⅰ和模式Ⅱ向模式Ⅲ转化,呈现出高温自润滑特性。在600℃时摩擦氧化明显,氧化物主要为无定形的SiO2,在摩擦表面形成一层由微米或亚微米级氧化物颗粒组成的薄膜,该薄膜层具有润滑作用;在氧化物薄膜层和摩擦表面存在一定程度的晶格畸变,增加了薄膜层的塑性变形能力,衰减了摩擦应力,这就是自对偶高温自润滑的机理。 The tribological characteristics of SiC and its composites self-mated couples from room temperature to 1200℃ was studied.With the increase of testing temperature,the friction coefficient of self-mated couples changes little,and the specific wear rate of SiC/SiC remains contant(Mode-Ⅰ),increases(Mode-Ⅱ) and decreases(Mode-Ⅲ);mild adhesive wear is dominating wear mechanisms of self-mated couples,wear Mode-Ⅰand Mode-Ⅱ are switched to Mode-Ⅲ,and self-lubrication appears at elevated temperature.The tribo-oxidization at 600℃ is severe to form a thin film made of oxided particles in micrometre or submicron size,the thin film is lubricated,and the main oxided product is amorphous SiO2;mild lattice distortion in film and friction surface improves the plastic deformation and decreases the friction stress on the surface,and this is the mechanism for self-lubrication.

关 键 词： 复相陶瓷 自润滑 高温 无定形 氧化物薄膜 特性 试验温度 自对偶 亚微米级 晶格畸变

领　　域： [化学工程] [化学工程] [理学] [理学]