| 고분자 열분해에 의한 $MoSi_2$/SiC 세라믹 복합체 |
| 김범섭, 김득중, 김동표1 |
성균관대학교 공과대학 재료공학과
1충남대학교 공과대학 정밀공업화학과 |
| $MoSi_2$/SiC Ceramic Composites Prepared by Polymer Pyrolysis |
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| ABSTRACT |
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The formation, microstructure and properties of MoSi2/SiC ceramic composites by polymer pyrolysis were investigated for the application of heating element material. Polymethylsiloxanes were mixed with Si, SiC, MoSi2 as filler and ceramic composites prepared by pyrolysis in N2 atmosphere at 1320~145$0^{circ}C$ were studied. Dimensional change, density variation and phases were analyzed and correlated to the resulting material properties. Microstructures of ceramic composite prepared by polymer pyrolysis were composed of MoSi2, SiC and silicon oxycarbide glass matrix. Depending on the pyrolysis conditions, ceramic composites with a density of 86~90 TD%, a fracture strength of 213~284 MPa, a thermal expansion coefficient of 4~7$times$10-6 were obtained. The electrical resistivity of the specimen decreased with increasing of temperature up to 50$0^{circ}C$. |
| Key words:
Polymer pyrolysis, $MoSi_2$/SiC composite, Heating material |
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