摘要
采用超音速火焰喷涂方法在45#钢表面制备高致密度的88WC-12Co涂层。利用X射线衍射、扫描电镜、显微硬度计等分析手段对喷涂及氧化后的涂层物相、显微结构和硬度变化进行表征,并对涂层材料的氧化机制进行探讨。结果表明:88WC-12Co涂层在500℃以下具有优良的抗氧化性能,氧化后的涂层硬度变化不大;在500℃以上生成的WO3和Co WO4相显著增多,88WC-12Co涂层的抗氧化性能明显下降,涂层显微硬度快速下降。高温下涂层中的WC、W2C以及Co与空气中的O2发生反应生成WO3和Co WO4。
A high density 88WC-12Co coating was prepared on the surface of 45#steel by high velocity oxy-fuel(HVOF).The microstructures,phases,and micro-hardness of the coatings after spraying and oxidation were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and micro-hardness tester respectively.The oxidation mechanism of the coating material was also discussed.The results show that 88WC-12Co coating has excellent oxidation resistance under 500℃,and the micro-hardness of the coating changes little after oxidation.However,the WO3 and CoWO4 phases significantly increased above 500℃,and the oxidation resistance and micro-hardness of the coating decreased obviously.The oxidation mechanism of the coating materials is that WC,W2C and Co in the coating react with O2 in the air to form WO3 and CoWO4 under high temperature.
作者
刘宝刚
马启林
刘超
彭馨可
朱肖运
季晴
LIU Baogang;MA Qilin;LIU Chao;PENG Xinke;ZHU Xiaoyun;JI Qing(School of Energy and Electromechanical Engineering,Hunan University of Humanities,Science and Technology,Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials,Loudi 417000,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第4期422-426,共5页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省大学生研究性学习和创新性实验计划项目。
