ZrB₂-based composites toughened by as-received and heat-treated short carbon fibers

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• 作者：J.J. Sha^a ; ^{jjsha@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{shajianjun720@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; J. Li^a ; ^{leejian@mail.dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Z.Z. Lv^a ; S.H. Wang^a ; Z.F. Zhang^a ; Y.F. Zu^a ; S. Flauder^b ; W. Krenkel^b
• 关键词：ZrB2 ; Ultra-high temperature ceramics ; Carbon fiber ; Fiber-toughened ceramics ; Fracture toughness
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：549-558
• 全文大小：5132 K

文摘

In order to improve the fracture toughness of ZrB₂ ceramics, as-received and heat treated short carbon fiber reinforced ZrB₂-based composites were fabricated by hot pressing. The toughening effects of the fibers were studied by investigating the relative density, phase composition, microstructure and mechanical properties of the composites. It was found that the densification behavior, microstructure and mechanical properties of the composites were influenced by the fibers’ surface condition. The heat treated fiber was more appropriate to toughen the ZrB₂-based composites, due to the high graphitization degree, low surface activity and weak interfacial bonding. As a result, the fracture toughness of the composites with heat-treated fiber is 7.62 ± 0.12 MPa m^1/2, which increased by 10% as compared to the composites with as-received fiber (6.89 ± 0.16 MPa m^1/2).