Properties and Microstructure of an HfB2-HfC-SiC Ultra High Temperature Ceramics
HfB2-HfC-SiC ultrahigh temperature ceramics (UHTCs) were prepared and characterized in this paper.It is showed that the densities of the HfB2-HfC-SiC reach 98.5% of the theory density.The room temperature compressive properties of the HfB2-HfC-SiC are good,while those at high temperature decrease rapidly.The volume expansion ratio monotonously increases (up to 2.35% at 2300℃) with increasing temperature.Furthermore,with increasing temperature,the average linear expansion coefficient hardly changes,while the instant linear expansion coefficient decreases first,and followed by an increase.The minimum value of the instant linear expansion coefficient is 5.65× 10-6/K at 900℃ and that of the mean linear expansion coefficient is 7.39× 10-6/K at 1340℃.HfB2-HfC-SiC were burned with the plasma arc heater.After g-second ablation,part of the SiC particles melted and spurted from the composites,and holes appeared.
Ultra-high temperature ceramics HfB2-HfC-SiC
Jinping Li Songhe Meng Jiecai Han Xinghong Zhang
Center for Composite Materials,Harbin Institute of Technology,Harbin150001,P R China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
1761-1763
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）