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采用离子喷涂和超音速火焰喷涂技术分别制备了NiCoCrAlY/Al2O3耐磨复合涂层,通过SEM、显微硬度计和万能材料测试机研究了粉体和涂层的显微结构、显微硬度和结合强度。结果表明,Al2O3颗粒表面包覆着一层致密的NiCoCrAlY合金,涂层与基体结合良好,超音速火焰喷涂涂层的孔隙率仅为等离子喷涂涂层的1/7。超音速火焰喷涂涂层的显微硬度和结合强度均高于等离子喷涂涂层。两种方法制备的涂层的破坏属脆性断裂机理。
NiCoCrAlY / Al2O3 wear-resisting composite coatings were prepared by ion spraying and supersonic flame spraying respectively. The microstructure, microhardness and bonding of the powders and coatings were studied by SEM, microhardness tester and universal testing machine. strength. The results show that the surface of Al2O3 particles is coated with a dense layer of NiCoCrAlY alloy and the coating is well bonded with the substrate. The porosity of supersonic flame sprayed coatings is only 1/7 that of plasma sprayed coatings. The supersonic flame spray coating has a higher microhardness and bonding strength than the plasma spray coating. The destruction of coatings prepared by either method is a brittle fracture mechanism.