The in situ controlled crystallizing process of Si-Al-Zr-O(SAZ) amorphous bulk was investigated by DSC, XRD, SEM and TEM techniques. The amorphous undergoes structural changes by treating at different temperatures. Phase segregation occurs at about 900℃, resulting in the formation of Si-rich and Al, Zr-rich regions. The t-ZrO2 is crystallized from the Al, Zr-rich region at 920--950℃ followed by poorly defined Al-Si spinel. With the increase of temperature up to 1000℃, mullite forms by reaction between Al-Si spinel and amorphous silica. The main crystalline phases identified are t-ZrO2, mullite and some cristobalite with the spinel disappearing above 1000℃.
TAN Xiao-Ping
,
LIANG Shu-Quan
,
ZHANG Yong
,
TANG Yan
,
ZHONG Jie
. Crystallization Behaviour of the Si-Al-Zr-O Amorphous Bulk[J]. Journal of Inorganic Materials, 2007
, 22(6)
: 1233
-1238
.
DOI: 10.3724/SP.J.1077.2007.01233
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