本研究運用田口實驗法分析探討電漿熱噴塗鈷鉬鉻矽粉材於Ti-6Al-4V上之鍵結強度最佳化分析，實驗採用影響電漿熱噴塗品質之五種重要製程參數為田口實驗之因子，包括送粉速率、噴塗距離、噴塗電流、主要氣體氬氣流速及次要氣體氫氣流速為因子參數。並於各個因子間採用上、下二種限度值為田口實驗之水準值，並表列於田口直交表中，再經由田口實驗法探討出最佳的因子參數排列並對應於最高的拉力試驗值。
從實驗結果中顯示，拉伸破裂面多發生於噴塗塗層與試片基材兩者之界面間，且實驗結果得知基材及拉伸試棒之表面處理，不僅影響基材與塗層界面間之鍵結品質，並且影響拉伸值之高低，其影響結果可經由拉伸試棒的破裂面得知，亦可從顯微觀察及SEM材料的元素分析中得知。

This study is to investigate the plasma thermal spray coating (Co-Mo-Cr-Si) on base metal of titanium alloy (Ti-6Al-4V) for the analysis of mechanism bonding properties. This research used the Taguchi methods to identify the significant parameters of plasma thermal spray process. We selected the powder feed rate, spray distance, electrical current, primary gas flow by argon and secondary gas flow by hydrogen as five factors in thermal spray parameter. We also selected the upper and lower values as two levels in orthogonal array table. Finally we obtain the best parameter arrangement from the signal to noise ratio and the mean of tensile test response table.
The results demonstrate that thermal spray with base metal surface preparation will not only affect boundary between base metal and spray coating but also cause the tensile test result. It could be observed that the separation on specimen surface of test bar with coating layers was integrated display on pictures by using microscope and exams the material element by using SEM. This phenomenon promoted the tensile test evidence, the separation of test bar appeared in boundary of base metal and coating.

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