TiB2-(Ti,W)C Eutectic Composite Ceramics Prepared by Combustion Synthesis under High Gravity
Large bulk solidified TiC-TiB2 eutectic composite ceramics were prepared by combustion synthesis under high gravity,and the WO3 was introduced into the combustion synthesis as one of oxidants in thermit to obtain the Ti-W-Cr-C-B liquid, so near-full-density TiB2-(Ti,W)C eutectic composite ceramics without the macrocracks were achieved. The ceramic matrix was mainly composed of TiB2-(Ti,W)C eutectic microstructures,and a few of Al2O3 and Al2O3-2rO2 eutectic structures were also detected in between Ti-W carbides. Due to the introduction of the high gravity field. Stocks immigration of the immiscible liquids took place due to their density differences,resulting in float-up of oxide liquid and settle-down of Ti-W-Cr-C-B liquid, and the layered melt consisting of oxide liquid and Ti-W-Cr-C-B liquid was formed,finally,TiB2-(Ti,W)C eutectic composite grown from the melt. Due to the mutual solubility of W-Ti,the W atom diffused into the TiC. leading to the formation of (Ti,W)C solid solution as same as crystal lattice structure of TiC. The relative density,Vickers hardness and fracture toughness of the composite ceramics measured 98.4％,26.4 GPa and 7.6±0.5 MPa.m1/2, respectively.
TiB2-(Ti,W)C composite Combustion synthesis High gravity Structure transformation
Xuegang Huang Long Zhang Zhongmin Zhao Chuanzeng Pan Guanling Su
Laboratory of Special Ceramics,Institute of Advanced Materials,Mechanical Engineering College,Shijia Laboratory of Special Ceramics,Institute of Advanced Materials,Mechanical Engineering College,Shijia Laboratory of Special Ceramics,Institute of Advanced Materials,Mechanical ngineering College,Shijiaz
国际会议
Frist Annual Meeting on Testing and Evaluation of Inorganic Materials(第一届全国无机材料测试与评价学术年会)
南昌
英文
386-389
2010-04-28（万方平台首次上网日期，不代表论文的发表时间）