Study of the Performance and Microstructure of CeB6/B4C Ceramic Composite via in-situ Synthesis
CeB6<,6>/B<,4>C ceramic composite was fabricated by hot-pressed sintering via in-situ synthesis reaction among B<,4>C, CeO<,2> and C. The effects of CeB<,6> content on the performance and microstructure of CeB <,3>/B<,4>C composites were investigated. As the content of CeB<,6> was 2.42％, the microhardness of CeB<,6>/B<,4>C composite reached the maximum of 40.64GPa, which was higher than that of monolithic B <,>C by 52.5％. As the content of CeB<,> was 4.89％, the flexibility strength and the fracture toughness of CeB<,6>/B<,4>C composite reached the peak values of 346.7MPa and 5.95MPa·m<1/2> respectively, which were higher than those of monolithic B<,4>C by 17.96％ and 61.7％ respectively. The integrated mechanical property of CeB<,6>/B<,4> C ceramic composite with the 4.89％ CeB<,6>, content is optimal. It was also found that as in-situ synthesis of CeB<,6>, the crystal grain growth was inhibited, and crystallite arrangement was so compact that the pores gradually reduced. The main fracture mode of CeB <,6>/B<,4>Cceramic composite was intercrystalline rupture, while the transcrystalline rupture was minor.
in-situ synthesis cerium boride boron carbide performance fracture mode rare earths
Xu Jingyu(徐璟玉) Wu Wenyuan(吴文远) Peng Kewu(彭可武) Ning Fuhu(宁福虎) Tu Ganfeng(涂赣峰)
School of Material and Metatlurgy, Northeastern University, Shenyang 110004, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
468-472
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）