本研究採用火焰熔射/重熔(Flame spray/fusion)製程技術，於低碳鋼底材上披覆Ni-WC熔射塗層。主要目的為探討添加WC對Ni基合金塗層之機械性質、磨潤性質、抗氧化性能之影響，唯鹽水噴霧試驗是採用HVOF塗層(Ni-WC)。實驗主要分為二個部份：第一部份探討WC摻雜比例(0 ~ 60 %)對於鎳基合金塗層性能之影響；第二部份探討不同尺寸WC晶粒及WC類型對於鎳基合金塗層性能之影響。
由實驗結果得知，採用Flame spray/fusion製程技術製備Ni-WC熔射塗層隨著WC摻雜比例之提升，硬度、抗磨耗及抗氧化方面的表現皆隨之提升，其中以60% WC摻雜比例為最佳；WC摻雜類型則以wc2 類型的碳化鎢粉末於鎳基熔射合金塗層具有最高硬度值Hv0.2 1103及最佳抗磨耗及抗氧化性能表現。
此外，於HVOF製程所製備之塗層於鹽水噴霧試驗中發現，隨著WC摻雜比例之提升，塗層的抗腐蝕性能反而下降；經比較奈米結構WC與傳統結構WC相，由於奈米結構WC較均勻地散佈於鎳基熔射合金塗層，使得摻雜10 %奈米結構WC之鎳基熔射合金塗層具有最佳抗腐蝕性能。

The main purpose of this research was to study the effects of WC addition on mechanical and tribological properties and anti-oxidation of Ni-based alloy coatings. The Ni-WC coatings on the substrate of low carbon steel were prepared by flame spray/fusion technique. Only HVOF coatings (Ni-WC) were used to salt spray corrosion test.
The experiment was divided into two parts. In the first part, the effect of content (0-60 % of WC addition) on the properties of Ni-based alloy coatings was investigated. In the second part, the effect of WC grain size in micro-scale (conventional) and nano-scale, and WC type on the properties of Ni-based alloy coatings were investigated.
The results revealed that the hardness, wear resistance, and oxidation resistance of Ni-WC coatings by flame spray/fusion process were increased with increasing content of WC addition. The coatings with 60% WC addition showed the best properties. The Ni-based sprayed alloy coatings with addition with wc2 type WC powder had the highest hardness of HV0.2 1103, the best wear resistance, and oxidation resistance.
In addition, it was observed that the corrosion resistance of Ni-WC coatings by HVOF process were decreased with increasing content of WC addition at salt spray corrosion test. The Ni-based sprayed alloy coatings with 10% nano-structured WC addition showed the best corrosion resistance, it can be attribute to nano-structured WC was homogeneous dispersion of Ni-based alloy coatings by compared with nano-structured WC and conventional WC.

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