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Reaction‐Bonded B 4 C with High Hardness
Author(s) -
Li Xiaoguang,
Jiang Dongliang,
Zhang Jingxian,
Zhu Yunzhou,
Chen Zhongming,
Huang Zhengren
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12507
Subject(s) - materials science , vickers hardness test , microstructure , porosity , homogeneous , composite material , carbon black , mixing (physics) , indentation hardness , carbon fibers , metallurgy , composite number , physics , natural rubber , quantum mechanics , thermodynamics
Reaction‐bonded B 4 C ( RBBC ) was fabricated through molten Si infiltrating porous B 4 C preforms. A preform with a 75% relative green density was obtained by mixing two different sized B 4 C powders. Carbon black added to the preform slightly reduces average pore size, but increases porosity. RBBC ceramics showed a dense and homogeneous microstructure. Vickers hardness was about 15 GP a for RBBC fabricated from a single type of B 4 C powder and could reach 22–23 GP a for the carbon‐added samples after infiltration. Morphological evolution and the influence of the microstructure on the Vickers hardness were investigated and discussed.