Journal of Inorganic Materials

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Crystallization Behaviour of the Si-Al-Zr-O Amorphous Bulk

TAN Xiao-Ping, LIANG Shu-Quan, ZHANG Yong, TANG Yan, ZHONG Jie   

  1. (School of Mterials Science and Engineering, Central South University, Changsha 410083, China)
  • Received:2006-11-09 Revised:2007-01-05 Online:2007-11-20 Published:2007-11-20
  • Contact: TAN Xiao-Ping E-mail:tanxiaoping-hn@163.com

Abstract: 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℃.

Key words: SAZ amorphous, phase development, microstructure change

CLC Number: 

  • TQ171