Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Characteristics of $\textrm{Al}_2\textrm{O}_3$-SiC Composite Powder Prepared by SHS Process and its Sintering Behavior

SHS법에 의한 $\textrm{Al}_2\textrm{O}_3$-SiC 복합분말 제조 및 소결특성

  • An, Chang-Yeong (Rapidly Solidified Advanced Materials Research Center, Chungnam National University) ;
  • Yun, Gi-Seok (Rapidly Solidified Advanced Materials Research Center, Chungnam National University) ;
  • Jeong, Jung-Chae (Rapidly Solidified Advanced Materials Research Center, Chungnam National University) ;
  • Won, Chang-Wan (Rapidly Solidified Advanced Materials Research Center, Chungnam National University)
  • 안창영 (충남대학교 급속응고신소재연구소) ;
  • 윤기석 (충남대학교 급속응고신소재연구소) ;
  • 정중채 (충남대학교 급속응고신소재연구소) ;
  • 원창완 (충남대학교 급속응고신소재연구소)
  • Published : 1999.08.01
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Abstract

The $Al_2$$O_3$-SiC composite powder was prepared by Self-propagating High-Temperature Synthesis(SHS) process using $SiO_2$Al and C powders as raw material. The effects of the molar ratio in raw material, compaction pressure, initial temperature of reactants on the products and combustion process were studied. Self-propagating high temperature synthesis of $SiO_2$/Al/C system should be preheated above $400^{\circ}C$ owing to the low combustion temperature. As the result of the combustion reaction, the purity of final product became better than that of reactants. In this system, the optimum molar ratio of $SiO_2$:Al:C was 3.0:4.0:6.0. The free carbon was removed by roasting at $650^{\circ}C$ for 30min. In this study, pressureless sintering was very dffective both for controlling the disintegration of specimen with powder bed and for obtaining dense sintered-body at $1700^{\circ}C$. The sintered-body produced with hot-pressing was about 98% of the theoretical relative density.

$Al_2$$O_3$-SiC 화합물 분말이 $SiO_2$, A1 그리고 C 분말들을 원료분말로 하여 SHS(self-propagating High-temperature Synthesis)법에 의해 제조되었다. 원료 분말에서의 몰비, 성형압력, 반응물의 초기온도의 영향이 생성물과 연소과정에 대해 연구되었다. $SiO_2$/A1/C계의 자전연소합성은 낮은 연소온도 때문에 $400^{\circ}C$ 이상으로 예열되어야 한다. 연소반응의 결과로서 최종생성물의 순도는 반응물의 순도보다 높았다. 이 계에서 $SiO_2$:Al:C의 적당한 몰비는 3.0:4.0:6.0이었고, free carbon은 30min 동안 $650^{\circ}C$에서 배소함으로써 제거되었다. 본 연구에서 상압소결은 $1700^{\circ}C$에서 powder bed를 사용한 표본의 분해를 제어하고 치밀한 소결체를 얻는데 매우 효과적이었다. hot-pressing으로 생성된 소결체는 이론비교밀도의 약 98%이었다.

Keywords

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