OS1337-257 PSZ-Ti複合材料の放電プラズマ焼結過程の検討

Abstract

This paper deals with spark plasma sintering (SPS) process of partially stabilized zirconia (PSZ), pure titanium (Ti) and PSZ-Ti composites. To examine the densification process during SPS, the sintering schedule which was the condition of 5 min hold at 1200℃ was terminated at given temperature and sintering time to obtain semi-sintered materials, and their microstructure and relative density were examined. Up to 800℃ in sintering process, the densification progressed more quickly in the materials with higher Ti-content. Over 800℃, however, the densification in the 80% Ti composite was delayed as compared with the other materials. According to the X-ray diffraction (XRD) analysis Ti_2O and Ti_2ZrO were detected and pure Ti was not detected at higher temperature than 800℃. It was found that the creation of Ti_2O and Ti_2ZrO affects the densification in PSZ-Ti composites, especially in the Ti-rich composites.