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通过高速电喷镀工艺在Ni基高温合金K17表面沉积了纳米ZrO2/Ni复合镀层,测定了K17合金和纳米ZrO2/Ni复合镀层在1000℃的氧化动力学曲线,采用SEM、XRD和显微硬度计分析了纳米ZrO2/Ni复合镀层的组织结构、表面形貌和表面显微硬度;实验结果表明,镀层中纳米ZrO2的存在有利于细化复合镀层晶粒,提高复合镀层显微硬度;1000℃氧化5h后,纳米ZrO2/Ni复合镀层氧化膜由NiO,ZrO2和Cr2O3组成,1000℃氧化100h后,纳米ZrO2/Ni复合镀层氧化膜由NiO,NiCr2O4,ZrO2and Cr2O3组成;纳米ZrO2/Ni复合镀层中ZrO2和Cr2O3的存在明显改善了K17合金的抗高温氧化性。
The ZrO2 / Ni composite coating was deposited on the surface of Ni-based superalloy K17 by high-speed electrospray process. The oxidation kinetics curves of K17 alloy and nano-ZrO2 / Ni composite coating at 1000 ℃ were measured. The oxidation kinetics curves were investigated by SEM, XRD and microhardness The microstructure, surface morphology and surface microhardness of nano-ZrO2 / Ni composite coatings were analyzed. The experimental results show that the presence of nano-ZrO2 in the coating is conducive to the grain refinement of composite coatings and the microhardness of the composite coating; After oxidation for 5h, the oxide film of nano-ZrO2 / Ni composite coating consists of NiO, ZrO2 and Cr2O3. After oxidized at 1000 ℃ for 100h, the oxide film of nano-ZrO2 / Ni composite coating consists of NiO, NiCr2O4 and ZrO2and Cr2O3. The presence of ZrO2 and Cr2O3 significantly improves the high temperature oxidation resistance of K17 alloy.