氧化镧对纳米Al2O3-13TiO2等离子喷涂层的摩擦磨损性能影响

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The nano-ceramic coating was prepared by plasma spraying of nano Al2O3-13TiO2 powders with a small amount of La203. The friction properties were tested on the MMS-1 G high-speed friction and wear tester, and the morpholo- gy after wear was observed by scanning electron microscopy. The results show that the coatings with 1% La2 03 have a lower porosity, and a higher adhesive strength. During the high-speed friction and wear test, lanthanum oxide can reduce the fric- tion coefficient and wear rate, and the nano coatings with 1% La203 have excellent friction and wear properties. Wear is caused by coating spalling due to micro-crack expanding, the characteristic of adhesive wear is outstanding. Keywords： plasma spraying; nano coating; friction coefficient; wear rate以添加少量氧化镧的团聚纳米Al2O3-13TiO2粉末为原料，利用等离子喷涂技术制备纳米陶瓷涂层，在MMS-1G型高速摩擦磨损试验机上考察其摩擦磨损性能，并利用扫描电镜和能谱仪表征其磨损表面。结果表明i添加l％氧化镧的涂层具有更低的孔隙率，更高的抗拉结合强度；在高速摩擦磨损试验过程中，氧化镧可起到降低摩擦因数及磨损率的作用，添加1％氧化镧的纳米涂层摩擦磨损性能优良。磨损是由涂层微裂纹扩展导致的涂层剥落引起的，黏着磨损显著。