Effects of Ultra-high Gravity Field on the Microstructure and Mechanical Properties of Solidified TiC-TiB2 Ceramic Prepared by Combustion Synthesis

摘要：

　　Based on increasing the acceleration of high-gravity field from 500 g to 2500 g,a series of TiC-TiB2 composites are prepared by combustion synthesis in high-gravity field,and microstructure modification,microstructure homogeneity and mechanical properties of TiC-TiB2 composites are discussed in terms of liquid-liquid separation of TiC-TiB2 and Al2O3 in high gravity field.XRD,FESEM and EDS results showed that by increasing the acceleration of high gravity field,Al2O3 inclusions in the ceramic decreased both in volume fraction and size due to the enhanced separation of TiC-TiB2 liquid and Al2O3 liquid,while the enhanced Stokes flow induced by the enhanced liquid-liquid separation also promoted the constitutional homogeneity of TiC-TiB2melt,thereby bringing about the refinement of the solidified microstructures,finally,making Vickers hardness and fracture toughness of the composites increase with the acceleration of high gravity field.

关键词： high gravity field liquid-liquid separation microstructure modification microstructure homogeneity

作者: Qi Song Zhongmin Zhao Long Zhang

作者单位: Vehicle and Electric Engineering Department,Mechanical Engineering College,Shijiazhuang 050003,China

会议类型: 国际会议

会议名称: 2013 International Conference on Energy Research and Power Engineering(2013能源研究与电力工程国际会议)(ERPE2013)

会议地点: 郑州

会议语种:英文

页码: 913-917

在线出版日期: 2013-05-24（万方平台首次上网日期，不代表论文的发表时间）