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采用等离子喷涂和超音速火焰喷涂工艺在汽轮机动叶片1COMoVNbN母材上制备了WC-Co防护涂层。利用X射线衍射仪、扫描电子显微镜和高温冲蚀试验机等技术研究了涂层的相结构、表面形貌、孔隙率以及抗高温氧化和抗固体微粒侵蚀性能。结果表明,超音速火焰喷涂相比于等离子喷涂所制备的涂层中,WC相含量较多,涂层致密,孔隙率小。超音速火焰喷涂制备的含17%Co的WC-Co涂层相比于母材具有较好的抗高温氧化和抗固体微粒侵蚀性能。
WC-Co protective coating was prepared on 1COMoVNbN base metal of turbine rotor blades by plasma spraying and supersonic flame spraying. The phase structure, surface morphology, porosity, as well as high temperature oxidation resistance and erosion resistance of solid particles were studied by X-ray diffraction, scanning electron microscopy and high temperature erosion tester. The results show that supersonic flame sprayed coating prepared by plasma spraying, the WC phase content more dense coating, porosity is small. The WC-Co coating containing 17% Co prepared by supersonic flame spraying has better resistance to high temperature oxidation and solid particle erosion than the base metal.