Optimization for Microstructure and Properties of cBN/TiC Composite

• Main Authors: Shu-Yu Guan, 官書瑀
• Other Authors: Shi-Rung Chiou
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/20863903060259048381

碩士 === 國立高雄應用科技大學 === 模具工程系碩士班 === 102 === This study fabricated cubic boron nitride/titanium carbide (cBN/TiC) composites by a two-step sintering process. The Taguchi method was applied to analyze the optimum process parameters. The process parameters comprise sintering cycle, ratio of cBN/TiC, 1st-step sintering duration and 2nd-step temperature. Flexural strength, porosity and abrasion resistance of the composites were chosen as quality target. The optimal processes were obtained by analysis of variance(ANOVA) followed with confirmation experiment and analysis. Results indicated the optimal process for flexural strength is A3 B2 C2 D1 and that for porosity and abrasion resistance is A3 B2 C1 D1. A3 B2 C1 D1 was chosen as the optimal process for this study with parameters of two-step sintering cycle, 1st–step duration of 2h, 2nd-step temperature of 1250℃, and cBN/TiC ratio of 1.5:1. The obtained flexural strength, porosity, and weigh loss from abrasion resistance is 126.48MPa, 13.1%, and 4.46538x10-3mg/mm2, respectively. In addition, TiB2, TiNi3, BNi, Ni3P, Ni5P2, and Ni4N were formed when the composites had different ratio of cBN/TiC.