热喷涂碳化钨/钻金属陶瓷涂层，由于其具有极高的硬度、优越的耐磨性能和良好的韧性，广泛地应用于航空航天、汽车、冶金、电力、造纸等领域，以提高零部件表面的耐磨性能及修复磨损部位。但又由于超音速火焰喷涂的焰流速度很高，而WC-Co颗粒在基体上冷却速度极快，在快速冷却过程中，极易在涂层中形成一定的非晶相，这些非晶相在喷涂后进行的热处理过程中会发生改变，从而影响涂层的相结构和组织，进而影响涂层的性能。本文对超音速火焰喷涂制备的WC-17Co涂层作保护气氛(Ar)热处理，热处理温度分别为500℃、700℃、900℃、1100℃，保温时间均为lh；采用扫描电镜(SEM)、能谱(EDS)、X射线衍射(XRD)、显微硬度、腐蚀试验等检测手段，分析了热处理对涂层组织结构、耐磨性能以及抗腐蚀性能等的影响。并得出了以下结论： （1）WC-17Co涂层在经过700℃及以上温度热处理后，会出现W2C相逐渐减少而非晶态的Co发生再结晶和生成新的的Co3W3C和Co6W6C相的现象；涂层经过500℃、700℃、900℃、1100℃热处理后，涂层的硬度呈现出先升高后降低的趋势；涂层在经过700℃处理后硬度达到最高，然后逐渐降低，但均高于喷涂态硬度；热处理可显著促进Fe元素和Co元素在涂层与基体间的扩散，温度越高，扩散越充分，且在900℃时涂层与基体间形成扩散带； （2）随着热处理温度的提高，涂层的抗磨损性能先升高后降低，WC-17Co涂层经900℃热处理后具有最优的抗磨损性能； （3）过高温度的热处理使得Co-W-C三元合金和非晶相减少，Co3W3C和Co6W6C的增多，加剧了涂层在H2SO4溶液中的电偶腐蚀，热处理使得WC-17Co涂层的耐腐蚀性能下降。

Thermal spraying WC-Co cermet coatings is widely used in aerospace, automotive, metallurgy, electric power, papermaking and other fields to improve the wear resistance of many types of engineering components or to repair worn parts, because of its high hardness, excellent wear resistance and good toughness. However, high temperature reactions during spray and quench at high cooling rates inherent in the HVOF deposition process can convert WC to other Co-W-C amorphous phases. The amorphous phases can significantly improve the properties of WC–Co coatings coupled with a transformation in the phase composition during the heat treatments. In this paper, WC-17Co coatings was through the use of post-spraying heat treatment in an inert atmosphere (Ar), the samples were separately heat treated at 500℃, 700℃, 900℃ and 1100℃ for 1 hour. The influence of heat treatment on the phase, microstructure, wear-resistance and corrosion resistance of coatings were researched by means of SEM, EDS, XRD and other instruments. The conclusions are as follows. When the heat treatment temperature was above 700℃, W2C and Co-W-C amorphous phases were reduced to form the Co3W3C and Co6W6C. With the increase of heat treatment temperature, the hardness of coatings were firstly increased and then decreased. The highest hardness were found when the heat treatment temperature was 700℃. The diffusion speed of element such as Fe and Co at the interface of coating and substrate increase with the treatment temperature, an obvious diffusion bond appeared at the temperature of 900℃. With the increase of heat treatment temperature, the sliding-wear resistance of coatings were firstly increased and then decreased. The highest sliding-wear resistance were found when the heat treatment temperature was 900℃. WC-17Co coatings showed better sliding-wear resistance by the heat treatment. With the increase of heat treatment temperature, W2C and Co-W-C amorphous phases were reduced to form the Co3W3C and Co6W6C, which increased galvanic corrosion at the carbide–substrate interface in H2SO4 solution of WC-17Co coatings. The heat treatment decreased the corrosion resistances of WC-17Co coatings in H2SO4 solution.