Hot pressed ZrB₂–SiC–C ultra high temperature ceramics with polycarbosilane as a precursor

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• 作者：Xiao-Jun Zhou ; Guo-Jun Zhang ; Yao-Gang Li ; Yan-Mei Kan ; Pei-Ling Wang
• 关键词：Zirconium diboride ; Polycarbosilane ; Densification ; Hot pressing ; Ultra high temperature ceramics
• 刊名：Materials Letters
• 出版年：2007
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：February 2007
• 卷：61
• 期：4-5
• 页码：960-963
• 文件大小：403 K

摘要

ZrB₂–SiC–C ultra high temperature ceramics (UHTCs) have been produced by hot pressing pyrolyzed mixtures of ZrB₂ and polycarbosilane (PCS). Samples with SiC contents of 0%, 5%and 16%in volume derived from PCS were prepared. The phase composition, microstructure and mechanical properties were characterized for composites hot pressed at 2073 K for 60 min under the pressure of 20 MPa in an argon atmosphere. Analysis showed that the addition of PCS improved the relative density from 78%(without PCS addition) to  100%(with 16%SiC derived from PCS addition). Hardness and fracture toughness of the composite were also improved.