(1. 水利部产品质量标准研究所，杭州 310012；
2. 浙江省水利水电装备表面工程技术研究重点实验室，杭州 310012；
3. 水利机械及其再制造技术浙江省工程实验室，杭州 310012；
4. 水利部杭州机械设计研究所，杭州 310012)
摘 要: 采用X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计、摩擦磨损试验机、冲蚀试验机等手段研究高温及氧化对超音速喷涂WC-10Co4Cr涂层的显微组织、显微硬度、结合强度、耐磨性能、耐冲蚀性能等的影响。结果表明：在空气中经600℃热处理后，涂层发生了明显的高温氧化，涂层中WC、Co、Cr相的含量降低，转化为CoWO4、Cr2O5、C6WO6等氧化物相，孔隙率明显升高，结合强度有所降低，虽然涂层的显微硬度值有所提高，但耐磨损及耐冲蚀性能都明显降低；通过Ar保护，涂层只受到600℃的高温作用，涂层的相组成未发生明显改变，显微硬度有较大幅度的提高，且分布更加均匀，耐干摩擦磨损及耐泥沙冲蚀性能均获得大幅提高。
关键字: WC-10Cr4Cr涂层；高温；氧化；微观结构；性能
（1. Standard and Quality Control Research Institute, Hangzhou 310012, China;
2. Hydraulic Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China;
3. Hydraulic Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China;
4. Hangzhou Mechanical Research Institute, Hangzhou 310012, China）
Abstract:The effects of temperature and oxidation on the microstructure, microhardness, binding strength, wear resistance, corrosion wear resistance of high velocity sprayed WC-10Co4Cr coatings were investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness measurement, wear testing machine and wear corrosion testing machine. The results show that the coatings are high temperature oxidized obviously after heat treatment at 600 ℃ in air. WC, Co, Cr content are reduced and converted into CoWO4, Cr2O5, C6WO6, and so on, the porosity of coatings increases significantly, the bonding strength reduces. Although the microhardness value of the coatings increases, but the wear resistance and corrosion wear resistance reduce significantly. The coatings is only subjected at high temperature of 600 ℃ in Ar, the microstructures of the coatings do not change obviously, the microhardness is improved by large margin and distributes more uniformly, the wear resistance and corrosion wear resistance are improved by large margin.
Key words: WC-10Co4Cr coatings; high temperature; oxidation; microstructure; properties
