摘要
采用真空热压成形工艺,通过添加不同体积分数的复合润滑剂,制备出了48Ti-48Al-2Nb-2Cr自润滑材料。建立了其高温抗摩擦磨损模型,考察了其磨损率影响因素,并通过高温磨损试验分析了其减摩机理。结果表明:添加固体润滑剂对自润滑材料的磨损率有很大影响,其中,当添加的复合润滑剂(38%CaF2-62%BaF2)的体积分数为10%时自润滑材料的磨损率最低;自润滑材料在摩擦磨损过程中,能够在磨损表面形成一层较完整的固体润滑膜,膜的存在使得自润滑材料具有很好的减摩能力。模型的建立及成膜机理的分析为Ti-Al系合金高温环境下的使用提供了理论依据。
Ti-48Al-2Nb-2Cr self-lubricating materials with addition of different weight contents of eutectic solid lubricant were fabricated by vacuum hot pressing technology. A wear mathematic model at high temperature was proposed and wear mechanism was analyzed. The self-lubricating materials with 10% solid lubricant exhibit higher wear properties. It is indicated that a glaze film on the wear surface of TANC composites by addition of BC solid lubricant are formed since fluoride particles are forced out of the reservoirs due to its high thermal expansion coefficient. Additions of （38%CaF2＋62%BaF2） solid lubricant to Ti-Al matrix can greatly enhance the wear resistance and reduce the friction coefficient of the self-lubricating materials.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2008年第5期602-605,共4页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50275110)
山东省教育厅科技计划资助项目(J07YA19)
