Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Fabrication of $Al_2O_{3p}/Al$ composites by in-situ Reaction Process of Molten Al

In-situ 반응에 의한 $Al_2O_{3p}/Al$기 복합재료의 제조

  • 김재동 (경상대학교 해양산업연구소) ;
  • 정해용 (부경대학교 재료공학과) ;
  • 고성위 (부경대학교 제어기계공학과)
  • Published : 1999.06.01
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Abstract

The fabrication process of $Al_2O_{3p}/Al$ composite by in-situ process was investigated. The effects of processing variables such as addition type and content of Mg, processing temperature and time on the infiltration behavior of molten Al, microstructure and hardness were investigated. When the pure Al was infiltrated into mixtures of Mg and $Al_2O_3l$ powder, processing temperature required to spontaneous infiltration was decreased, and the content of Mg was the most powerful variable for infiltration of molten Al. But when the Al-Mg alloy was infiltrated into $Al_2O_3l$ particles, infiltration ratio indicated nearly same value regardless of Mg content in alloy and processing temperature, and critical processing temperature required to spontaneous infiltration was $800^{\circ}C$. The $Al_2O_{3p}/Al$ composites which were fabricated by mixtures of Mg and $Al_2O_3l$ powders resulted in high hardness value, but hardness values were scattered due to non uniform dispersion of $Al_2O_3l$ particles by excessive reaction of Mg.

In-situ process에 의한 $Al_2O_{3p}/Al$기 복합재료 제조시, Mg의 첨가형태와 함량, 공정온도 및 유지시간이 응용Al의 침투거동과 미세조직 및 경도에 미치는 영향을 조사하였다. Mg분말과 $Al_2O_3$입자의 혼합분말에 순 Al을 침투시켜 복합재를 제조하는 경우, 침투율에 영향을 주는 가장 유력한 변수는 Mg분말의 함량이며, Mg의 활발한 반응으로 $700^{\circ}C$의 낮은 온도에서도 침투가 가능했다. 한편 Al-Mg합금을 $Al_2O_3$입자에 침투시켜 복합재를 제조하는 경우 Mg함량과 공정온도에 관계없이 거의 동일한 침투율을 나타냈으며 침투 가능한 공정온도는 $800^{\circ}C$이었다. Mg과 $Al_2O_3$의 혼합분말로 제조한 복합재가 Al-Mg합금으로 제조한 복합재 보다 월등히 높은 경도를 나타냈으나, 과도한 계면방응에 의한 불균일한 강화상의 분산으로 경도의 산포도는 컸다.

Keywords

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