摘要
采用喷雾干燥法对溶胶-凝胶法合成的系列A l2O3/TiO2纳米复合粉体进行造粒,使用等离子喷涂技术制备系列A l2O3/TiO2纳米复合涂层.对涂层结构和形貌分析表明所制备的A l2O3/TiO2纳米复合涂层形成了具有熔融区和半熔融区的双区形态的纳米复合结构.使用UMT-2MT试验机研究了复合涂层的摩擦磨损性能,结果表明复合涂层的磨损率随TiO2含量的增加表现出先降低而后增大的趋势,TiO2质量百分数为10%的纳米复合涂层的磨损率最低;而涂层的摩擦系数随TiO2含量的增加变化不大.复合涂层的磨损机制为裂纹扩展导致的磨损剥落.
Series of Al2O3/TiO2 nanocomposite powders synthesized by sol-gel method were spray dried,and series of nanocomposite coatings were prepared by plasma spraying using the spray dried powders.The nanocomposite coating had a dual-zone nanocomposite structures with semi-molten zone and melting zone.The friction and wear properties of the coatings were investigated on a UMT-2MT tester.The results indicated that the wear rate of the coatings first decreased and then increased with the increasing TiO2 content,and the coating with 10% TiO2 had the lowest wear rate.The friction coefficients of the coatings were in the range of 0.6 to 0.8.The wear mechanism of the nanocomposite coating was mainly due to the spalling caused by crack propagation.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2011年第4期362-368,共7页
Tribology
基金
国家创新研究群体基金(50421502)
973基金项目(2007CB607601)资助~~
