Microstructure and mechanical properties of B₄C-HfB₂-SiC ternary eutectic composites prepared by arc melting

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• 作者：Rong Tu^a ; Nian Li^a ; Qizhong Li^b ; ^c ; ^{qizhongli@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Song Zhang^a ; Lianmeng Zhang^a ; Takashi Goto^d
• 关键词：Arc-melting ; Eutectic boride and carbide ; Vickers hardness ; B4C&ndash ; HfB2&ndash ; SiC composites ; Lamellar structure
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：36
• 期：4
• 页码：959-966
• 全文大小：4571 K

文摘

In order to improve the hardness and toughness simultaneously, B₄C–HfB₂–SiC ternary composites were synthesized by arc-melting using B₄C, HfB₂ and β-SiC powders as raw materials. The ternary eutectic composition of 45B₄C–15HfB₂–40SiC (mol%) was first identified with a lamellar eutectic texture. HfB₂ about 500 nm in thickness and SiC about 700 nm in thickness were uniformly dispersed in B₄C matrix of the eutectic composite, much smaller than raw powders. The Vickers hardness and fracture toughness of B₄C–HfB₂–SiC ternary eutectic were 35.7 GPa and 6.5 MPa m^1/2 at the eutectic composition, respectively.