| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 97 === The main purpose of this research was to study the effects of WC addition Ni-based alloy coantings and different type WC coatings on mechanical and tribological properties and anti-oxidation, anti-corrosion. The WC coatings on the substrate of low carbon steel were prepared by HVOF.
The experiment was divided into three parts. In the first part, the effect of content (0-80 % of WC addition) on the properties of Ni-based alloy coatings was investigated. In the second part, the effect of different WC structure in micro-scale (conventional), nano-scale and multimodal on the properties of WC/Co coatings were investigated. In the third part, the effect of different binder of Co, CoCr and Ni of WC coatings were investigated.
The results revealed that the hardness, wear resistance, and oxidation resistance of WC/Ni coatings were increased with increasing content of WC addition. And, the coatings with 60 % WC addition showed the best properties, but the coatings with 80% WC addition didn’t obvious increase the properties. The WC/Co coatings with multimodal structure had the best wear resistance, due to the coating structure is dense and form Interlock effect, to avoid the WC grains fall off from the coating. The WC coatings with CoCr binder had the best wear resistance and corrosion resistance.
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