蛇纹石内氧化效应对铁基金属磨损表面自修复层生成的作用  

The Effect of Internal Oxidation from Serpentine on Generating Reconditioning Layer on Worn Ferrous Metal Surfaces

作　　者：金元生[1,2] 

机构地区：[1]清华大学摩擦学国家重点实验室,北京100084 [2]北京金飒新材料科技有限责任公司,北京100085

出　　处：《中国表面工程》2010年第1期45-50,56,共7页China Surface Engineering

基　　金：科技部科技型中小企业技术创新基金支持项目(08C26211101608)

摘　　要：以蛇纹石,矿物质羟基硅酸镁Mg6(Si4O10)(OH)8,为主成分的自修复剂对金属磨损表面的修复作用,在我国已得到较为广泛关注和认同。文中以在内燃机车柴油机缸套内表面生成的自修复层为例,通过SEM,XRD,XPS,AES,Laser Raman,HRTEM,STEM和纳米硬度计等表面分析和测量手段,深入观察和分析了磨损表面自修复层的生成机理。结果表明:蛇纹石的高化学活性使氧原子、氧离子和自由水从表面向内部强扩散,铁基金属的合金成分渗碳体(Fe3C)被氧化。这是有别于高温内氧化的一种特殊的内氧化过程,对磨损表面生成自修复层有决定性的作用。进而,摩擦副的相对往复运动诱发内氧化组织的形变细化和形变强化,形成性能优异的自修复保护层。The restoring effect on worn metal surfaces from auto-reconditionging agent containing serpentine, mineral magnesium silicate hydroxide of empirical formula Mg6（Si4O10）（OH）8, as a main component has been widely interested and recognized by specialists in the fields of both science and technology in our country. As an example, the genaration mechanisms of reconditioning layer on cylinder bore of a locomotive diesel engine were observed and investigated in detail through various means of surface analysis and measurememt including SEM, XRD, XPS, AES, Laser Raman, HRTEM, STEM, and Nanoindentor. The results indicate that the strongly diffusing in of oxygen atom, ion and free water from the metal surface by high chemical activity of serpentine results in oxidation of alloy component （Fe3C） of Fe-based metal. This is a special internal oxidation process quite different from the high temperature internal oxidation which plays a crucial role to form the reconditioning layer. Sequentially, the deformed refinement and strengthening of the intemal oxidation structure under reciprocating movement of the fiction pair bring on the reconditioning protective layer with excellent behaviors.

关 键 词：蛇纹石 磨损自修复 表面扩散 内氧化 形变组织强化 

分 类 号：TG115.5[金属学及工艺—物理冶金] TH17[金属学及工艺—金属学]