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采用高能球磨机在室温下于碳钢表面制得NiCrAlCoY涂层,利用SEM、EDS、XRD、显微硬度测试和高温氧化实验等方法分析涂层的显微形貌、组织结构、显微硬度及高温氧化性,并对机械合金化过程中基体表面形成涂层的机理作了初步探讨。研究结果表明,提高球磨转速有利于涂层厚度、显微硬度的增加和抗高温氧化性的提高;以400r/min球磨10h时,碳钢表面形成界面结合良好且平均厚度为50μm的NiCrAlCoY涂层;合金涂层显微硬度HV0.1最大达706,约为基体硬度的3倍;界面结合处的硬度呈梯度变化,对涂层起到良好的支撑作用,而涂层的存在显著提高了基体的抗高温氧化性能。
NiCrAlCoY coating was prepared on the surface of carbon steel by high energy ball mill at room temperature. The microstructure, microhardness and high temperature of the coating were analyzed by SEM, EDS, XRD, microhardness test and high temperature oxidation test. Oxidation, and the mechanism of the formation of coating on the surface of the substrate during mechanical alloying was discussed. The results show that increasing milling speed is beneficial to the increase of coating thickness, microhardness and high temperature oxidation resistance; NiCrAlCoY coating with good interface bonding and average thickness of 50μm is formed on the surface of carbon steel by ball milling at 400r / min for 10h ; The hardness of the alloy coating HV0.1 up to 706, about three times the hardness of the substrate; interface hardness at a gradient gradient, the coating play a good supporting role, and the presence of the coating significantly improves the substrate High temperature oxidation resistance.