Pressureless Sintering of Ultra-high Temperature ZrB2-SiC Ceramics
ZrB2-SiC ultra-high temperature ceramics (UHTCs) were pressureless sintered with Y2O3-Al2O3 as the sintering additives.The effects of sintering additive and crystallization annealing on the microstructure and properties of ZrB2-SiC UHTCs were investigated.Sintering was activated by producing liquid phase of Y2O3 and Al2O3.The relative density of sintered ZrB2-20wt%SiC ceramic could reach 96% when the content ofsintering additive was 6% and the sintering temperature was 1750℃ and its bending strength,Vickers hardness,and fracture toughness were 412 MPa,13 GPa,and 6.0 MPa·m1/2,respectively.The crystallization annealing can result in YAG phase from grain boundary and enhance the high temperature properties of the UHTCs.The UHTCs have excellent ablation resistance at ultra-high temperatures,and a very low ablation rate of 0.0006 mm/s after ablation for 900s at 2800℃.
ZrB2-SiC UHTCs Pressureless sintering Crystallization annealing Ablation resistance
Zhi-qiang Cheng Chang-ling Zhou Ting-yan Tian Cheng-gong Sun Zhi-hong Shi Jie Fan
School of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Shandon School of Material Science and Engineering,Jinan University,Jinan 250022,China;Shandong Research & D Shandong Research & Design Institute of Industrial Ceramics,Zibo 255031,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
1746-1749
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）