Abstract
Mullite whiskers were synthesized using $Al(OH)_3$, amorphous $SiO_2$ and $AIF_3$ as starting materials by a vapor-solid reaction at relatively low temperature of $1100^{\circ}C$. Leaflet Fluorotopaz was observed for the specimen heat-treated at $800^{\circ}C$. Fluorotopaz was decomposed at $1000^{\circ}C$ and only mullite phase was observed for the specimen sintered at $1100^{\circ}C$ and above. It was found that the synthesized mullite at $1200^{\circ}C$ had grown to [001] direction and side planes were the {110}. The distance of (110} plane was $5.34^{\AA}C$. The amounts of $Al_2O_3$ in mullite was 73.56(1.39)wt%.
$Al(OH)_3$, 비정질 $SiO_2$, $AIF_3$를 출발원료로 기상-고상 반응을 통해 $1100^{\circ}C$의 저온에서 뮬라이트 휘스커를 합성하였다. $800^{\circ}C$ 온도부근에서 협상의 플루오르토파즈의 생성이 관찰되었으며, $1000^{\circ}C$부터 토퓨ㅏ즈의 분해갸 시작되어 $1100^{\circ}C$ 이상의 온도에서는 전량 뮬라이트가 관찰되었다. $1200^{\circ}C$에서 합성된 뮬라이트 휘스커는 성장 방향이 [001] 방향이었으며, 성장방향에 평형한 면은 {110}면이었다. {110}면사이의 면간 거리는 $5.34^{\AA}C$이었으며, 뮬라이트를 이루는 $Al_2O_3$의 함유량은 73.56wt%이었다.