Properties of <TEX>$MoSi_2$</TEX> Based Composite Materials

J. Ocean Eng. Technol. 2009;23(6):93-98.

Properties of $MoSi_2$ Based Composite Materials

Lee Sang-Pill,Cho Kyung-Seo,Lee Jin-Kyung,Bae Dong-Su

Department of Mechanical Engineering Dong-Eui University,Department of Mechanical Engineering Dong-Eui University,Department of Mechanical Engineering Dong-Eui University,Department of Materials Science & Engineering Dong-Eui University

$MoSi_2$ 복합재료의 특성

이상필,조경서,이진경,배동수

동의대학교 기계공학과,동의대학교 기계공학과,동의대학교 기계공학과,동의대학교 신소재공학과

Keywords: Reinforcement type, Volume fraction, Particle size, Mechanical property, Microstructure

핵심용어: 강화재 종류, 체적율, 입자크기, 기계적 특성, 미세구조

Abstract

The mechanical properties of $MoSi_2$ based composites containing various types of reinforcement, such as SiC, $ZrO_2$, and W, were investigated, based on detailed examinations of their microstructures. $MoSi_2$ based composites were fabricated at a temperature of $1350^{circ}C$ using a hot-press device. The volume fraction of SiC and $ZrO_2$ particles in this composite system was fixed as 20%. The volume fraction of three types of W particles was changed from 10% to 30%. The characteristics of the $MoSi_2$ based composites were determined by means of optical microscopy and a three-point bending test. The addition of W particles to the $MoSi_2$ powders exhibited a sufficient improvement in the microstructure and mechanical property of the sintered $MoSi_2$ materials, compared to those of SiC and $ZrO_2$ particles. In particular, W/$MoSi_2$ composites containing W particles of 20 vol% represented a good flexural strength of about 530MPa at room temperature, accompanying a relative density of about 92%. The flexural strength of the W/$MoSi_2$ composites tended to decrease with an increase in the average size of the W particles.