| B4C/Al 복합체 제조시 함침 분위기가 물성에 미치는 영향 |
| 임경란, 강덕일, 김창삼 |
| 한국과학기술연구원 재료연구부 |
| Effects of Atmosphere during Al Infiltration on Properties of B4C/Al Cermets |
| Kyoung-Ran Lim, Deog-Il Kang, Chang-Sam Kim |
| Division of Materials Science and Engineering, KIST |
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| ABSTRACT |
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Properties of $B_4C/Al$ cermets were studied as a function of atmosphere during infiltration and post-heat treatment. The cermet A(infiltrated at $1100{circ}C$/10 min under vacuum) had 19.4 wt% of Al but the cermet B(infiltratd at $1080{circ}C$/10 min under a flowing argon) showed 14.4 wt% of Al. It indicated that the reaction between $B_4C$ and Al underwent slower under vacuum than under a flowing argon. The cermet B as infiltrated showed the density of 2.65 $g/cm^3$, the MOR of 503 MPa and the Young's Modulus of 237 GPa, but the post-heat treatment at $900{circ}C$ for 8h under a flowing Ar gave rise to the cermet with the density of 2.65 $g/cm^3$, the MOR of 296 MPa, the Young's Modulus of 300 GPa. The cermet B showed better properties than the cermet A. Changes in compositions of the cermets by the post-heat treatment were observed qualitatively by XRD and SEM, the amount of Al was determined by analysis of its DSC curve. |
| Key words:
$B_4C/Al$ cermet, Atmosphere of infiltration, MOR, Young's modulus, Post-heat treatment |
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