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航空航天、热能、电力工业装备中许多在高温腐蚀性气氛条件下工作的摩擦运动副零部件,不仅要求材料具有优异的高温耐磨性与抗氧化性,同时由于高温条件下无法实现外加润滑而必须具有优异的高温自润滑性能。采用先进的表面工程手段在高温结构材料工件表面制备具有优良高温自润滑性能的先进氧化物陶瓷基高温自润滑耐磨复合材料涂层,是解决上述问题的有效方法之一。本文采用激光熔覆技术上制备出了以氧化物陶瓷Al_2O_3为基、以CaF_2为高温自润滑相的陶瓷基高温自润滑耐磨复合材料涂层,在干滑动磨损试验条件下测试了涂层的耐磨性能。结果表明,激光熔覆Al_2O_3/CaF_2陶瓷基高温自润滑耐磨复合材料中,具有优异高温耐磨性能及高温稳定性的Al_2O_3以片状初生相形式析出形成连续的基体骨架、而具有优异高温自润滑性能的CaF_2则呈球状均匀分布于基体骨架中之间;摩擦磨损试验结果表明,由于激光熔覆Al_2O_3/CaF_2陶瓷基高温自润滑耐磨复合材料集中了Al_2O_3先进氧化物陶瓷材料优异的高温耐磨性、高温抗氧化性及CaF_2高温自润滑相的优异高温自润滑性能,激光熔覆Al_2O_3/CaF_2陶瓷基高温自润滑耐磨复合材料涂层具有优异的摩擦学性能,同激光熔覆Al_2O_3陶瓷涂层相比,激光熔覆Al_2O_3/CaF_2陶瓷基高温自润滑耐磨复合材料?
In the aerospace, thermal power and electric power industry, many friction and kinematic components that work under high-temperature corrosive atmosphere not only require excellent high temperature wear resistance and oxidation resistance, but also can not be lubricated by high temperature Must have excellent high temperature self-lubricating properties. It is an effective way to solve the above problems by using advanced surface engineering methods to prepare advanced oxide ceramic-based high-temperature self-lubricating and wear-resistant composite coating with excellent high temperature self-lubricating properties on the surface of high temperature structural material. In this paper, a ceramic-based high temperature self-lubricating wear-resistant composite coating with Al 2 O 3 as the base and CaF 2 as the high temperature self-lubricating phase was prepared by laser cladding technique. The coatings were tested under dry sliding wear test Wear resistance. The results show that Al_2O_3, which has excellent high temperature wear resistance and high temperature stability, precipitates in the form of flaky primary phase and forms a continuous matrix skeleton in laser cladding Al 2 O 3 / CaF 2 ceramic self-lubricating high temperature self-lubricating wear resistant composites. The tribological properties of CaF_2 were uniformly distributed in the matrix between the matrix skeletons. The results of friction and wear tests showed that the laser-clad Al 2 O 3 / CaF 2 ceramic based high temperature self-lubricating and wear-resistant composites had the excellent high temperature resistance of advanced Al 2 O 3 ceramic materials Wear resistance, high temperature oxidation resistance and high temperature self-lubricating properties of CaF_2 high temperature self-lubricating phase. The laser cladding Al 2 O 3 / CaF 2 ceramic high temperature self-lubricating wear resistant composite coating has excellent tribological properties, same as laser cladding Al 2 O 3 ceramics Compared with laser cladding Al 2 O 3 / CaF 2 ceramic based high temperature self-lubricating wear resistant composites?