Microstructure and Mechanical Properties of TiC-Ni/Al Composites by the Reaction-Bonding Method

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J. Korean Ceram. Soc. > Volume 33(5); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(5): 536.

반응결합법에 의한 TiC-Ni/Al 복합체의 미세구조 및 기계적 특성

한인섭, 우상국, 김흥수¹, 양준환¹, 정윤중²

한국에너지기술연구소 에너지재료연구팀
¹한국에너지기술연구소 에너지재료연구
²명지대학교 공과대학 무기재료공학과

Microstructure and Mechanical Properties of TiC-Ni/Al Composites by the Reaction-Bonding Method

ABSTRACT

The TiC-Ni/Al reaction-bonding composites were prepared by the infiltration of Ni/Al melt into the TiC preforms. The microstructure the reaction composition crystalline phase and the mechanical properties of the composites were investigated. During the reaction-bonding Ni/Al mixture had a good wettability and per-meability with TiC preform and pore-free and fully dense sintered bodies were produced. In the case of the Ni/Al atomic ratio of 0.3 and 0.5 TiC raw particle shape was changed to irregular particles because of the decomposition in the liquid matrix and its phenomena was more distinguished in the Al-rich liquid matrix. With increasing more than 1 of the Ni/Al atomic ratio the sample of TiC grain shape was changed from spherical to palatelet particles. Also with increasing the atomic ratio of Ni/Al bending strength and fracture spherical to palatelet particles. Also with increasing the atomic ratio of Ni/Al bending strength and fracture toughness were increased and its maximum value was 1073 MPa and 11 MPa.m1/2 respectively.

Key words: Reaction-bonding, TiC-Ni/Al composites, Melt infiltration, Liquid phase sintering