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通过零件的表面硬化来提高其耐磨性是表面工程领域的一个持久性研究课题,采用HVOF(高速氧燃料)热喷涂处理可获得具有良好耐磨性和(或)耐蚀性的涂层。常用含某种金属粘结剂的碳化钨来获得这种涂层。本文采用钴粘结剂或镍粘结剂,通过HVOF处理来获得碳化钨涂层,并用光学和电子显微分析、硬度和密度测试,以及X射线衍射分析来表证涂层的特性。用HVOF处理获得的涂层结构致密,孔隙率低,平均硬度高达1100HV左右。HVOF沉积处理不会使所用粉末很快变质。
Improved wear resistance through surface hardening of parts is a persistent research topic in the field of surface engineering. Coatings with good wear resistance and / or corrosion resistance can be obtained with HVOF thermal spraying. This type of coating is commonly obtained using tungsten carbide containing some kind of metallic binder. In this paper, a tungsten carbide coating is obtained by HVOF treatment using a cobalt binder or nickel binder and the properties of the coating are characterized by optical and electron microscopic analysis, hardness and density tests, and X-ray diffraction analysis. The coating obtained by HVOF treatment has a compact structure with low porosity and an average hardness of about 1100 HV. HVOF deposition does not spoil the powder used quickly.