Manufacturing and Characterization for CBN/TiC alloy

• Main Authors: Yu-Gou Jan, 張裕國
• Other Authors: Shi-Yung Chiou
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/27754261552357107525

碩士 === 國立高雄應用科技大學 === 模具工程系 === 99 === CBN ceramic has the second highest hardness in the tool materials and is getting to be better mechanical properties combined with suitable agents. This study is to make the composite material CBN/TiC with process variables such as the ratio of CBN and TiC and the sintering processes including the conventional and two-step sintering. The ratios of CBN and TiC with 1:1 and 1:2 and 2:1 and maximum temperature 1400℃ and 2 hours duration for conventional sintering and 1400℃ with no duration followed by 1250℃ with 20hours duration for two-step sintering were taken. The characterization including the property measurement and the microstructure examination is employed. Archimedes method and Hv Vickers hardness tester and material tension machine were used to evaluate the porosities and Hv hardness and flexible strength while X-ray diffraction (XRD) and scanning electron microscope (SEM) were applied for analyzing the phases and morphologies along the boundary between CBN and TiC. The results show that the composite alloy sintered by two-step procedure of 2mole CBN to 1 mole TiC has the minimum porosity of 14% and the highest hardness of 4905Hv and the smallest grain size of 5.1μm and the highest flexible strength of 334MPa. The phases of CBN,TiC,TiB2 are revealed from XRD and the interdiffusion of elements such as B and Ti along the boundary between CBN and TiC particles from SEM analysis shows the sound sintering phenomena between the CBN and TiC particles