| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 104 === In this study, sintered Ni60-WC-Cr3C2 composites with different carbide concentrations were processed at different temperatures. There are three parts in this study. In the first part, the specimens were analyzed by scanning electron microscope (SEM) to examine the densification behavior, and XRD and EDXA to examine the constituting phases. In the second part, Optimization of the hardness was achieved by plotting the broken-line graph of carbide concentration, temperature and hardness. In the last part, the optimized composite in the second part were tested by corrosion test, wherein a 70% acid was used.
It was found the optimized composition and temperature is 30.0 vol% carbide sintered at 1150°C. The microstructural ananlysis indicted hardness is 899.9 kgf/〖mm〗^2, corrosion rate is 7.0 mg/〖cm〗^2．hr, porosity is 1.65%.
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