Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of Atmosphere during Al Infiltration on Properties of B4C/Al Cermets

B4C/Al 복합체 제조시 함침 분위기가 물성에 미치는 영향

  • 임경란 (한국과학기술연구원 재료연구부) ;
  • 강덕일 (한국과학기술연구원 재료연구부) ;
  • 김창삼 (한국과학기술연구원 재료연구부)
  • Published : 2002.01.01
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Abstract

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.

Al 함침에 의한 $B_4C/Al$ 복합체 제조시 Al 함침 분위기가 $B_4C/Al$ 복합체의 물성에 미치는 영향 및 후열처리에 미치는 영향을 조사하였다. 복합체 A($1100{\circ}C$/10분, 진공 함침)의 Al 함량이 19.4wt%로 복합체 B($1080{\circ}C$/10분, 상압의 알곤 함침)의 14.4wt%보다 많게 나타나 진공에서 B4C/Al 사이의 반응이 더디게 일어남을 알 수 있었다. 복합체 B의 열처리전의 물성은 밀도 2.65$g/cm^3$, MOR 503 MPa, Young's Modulus 237 GPa이고, $900{\circ}C/8h/Ar$ 열처리 후에는 밀도 2.56 $g/cm^3$, MOR 296 MPa, Young's Modulus 300 GPa로 복합체 A보다 우수한 물성을 보여주었다. 후열처리에 따른 구조의 변화는 XRD와 SEM에서 정상적으로 관찰되었으며, Al 함량은 DSC 분석으로 얻었다.

Keywords

References

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