Paper Title:
Pressureless Sintering of Ultra-High Temperature ZrB2-SiC Ceramics
  Abstract

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 of sintering additive was 6% and the sintering temperature was 1750°C 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°C.

  Info
Periodical
Key Engineering Materials (Volumes 368-372)
Edited by
Wei Pan and Jianghong Gong
Pages
1746-1749
DOI
10.4028/www.scientific.net/KEM.368-372.1746
Citation
Z. Q. Cheng, C. L. Zhou, T. Y. Tian, C. G. Sun, Z. H. Shi, J. Fan, "Pressureless Sintering of Ultra-High Temperature ZrB2-SiC Ceramics", Key Engineering Materials, Vols. 368-372, pp. 1746-1749, 2008
Online since
February 2008
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$32.00
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