Toughening of Boron Carbide Ceramics by Addition of <tex>$TiB_2$</tex>

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J. Korean Ceram. Soc. > Volume 33(4); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(4): 464.

$TiB_2$ 첨가에 의한 탄화붕소 소결체의 파괴인성 증진

이채현, 박원규, 김종희¹

배재대학교 무기재료공학과
¹한국과학기술원 재료공학과

Toughening of Boron Carbide Ceramics by Addition of $TiB_2$

ABSTRACT

Toughening mechanism of boron carbide ceramics by the addition of titanium boride was investigated. Speci-men was prepared by hot pressing of boron carbide with upto 30vol% of titanium boride particulates. Toughness of boron carbide ceramics was increased from 4.7 MPa m1/2 to 6.3 MPa m1/2 with 15 vol% TiB2 addition. But further increase of TiB2 content results in slow decrease of toughness. From microstructure evaluation and crack propagation behavior it is concluded that the major toughening mechanism is crack deflection pheno-mena.

Key words: Boron carbide, $TiB_2$, Hot pressing, Toughness, Crack deflection