(中南大學(xué) 材料科學(xué)與工程學(xué)院, 長(zhǎng)沙 410083)
摘 要: 采用差示掃描量熱分析(DSC)、 X射線衍射(XRD)分析、 紅外光譜(IR)分析和掃描電鏡(SEM)觀察等方法， 對(duì)Si-Al-Zr-O系非晶晶化過程、 晶核劑對(duì)晶化過程的影響進(jìn)行了研究。結(jié)果表明： Si-Al-Zr-O系非晶在935~970 ℃和1 100~1 200 ℃分別發(fā)生了四方氧化鋯和莫來石的析出反應(yīng)； TiO2和ZrO2作為晶核劑引入對(duì)四方氧化鋯和莫來石的析出有一定影響； TiO2含量的增加可使四方氧化鋯晶相的析出能力顯著提高， 而ZrO2含量的增加可提高莫來石晶相的析出能力。 根據(jù)晶化過程的研究結(jié)果制定了合理的晶化熱處理工藝，并獲得晶粒大小均勻、 結(jié)構(gòu)致密的微米晶、 納米晶、 莫來石/SiO2-t-ZrO2復(fù)相陶瓷。
關(guān)鍵字: Si-Al-Zr-O系非晶； 晶化行為； 陶瓷復(fù)合材料
TANG Yan, ZHANG Yong
（ School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The crystallization processes of the Si-Al-Zr-O(SAZ) amorphous bulk were investigated with the aid of DSC, IR, XRD and SEM analysis. The results show that there are two crystallization reactions during the heat treatment for SAZ amorphous bulk. The first crystallization reaction occurs in the range of 935-970 ℃. The tetragonal zirconia is formed. The second crystallization reaction occurs in 1 100-1 200 ℃. The main phases precipitated are mullite and cristobalite. The additions of ZrO2, TiO2 are useful to improve the crystallization behavior. With TiO2, ZrO2 content increase, crystallization temperature decreases. According to the investigation results, a nanometer dense(mullite, cristobalite )/zirconia composite ceramics with uniformly dispersed zirconia not greater than 1 μm are obtained after heattreatment of the homogenous Si-Al-Zr-O amorphous bulk.
Key words: Si-Al-Zr-O system; crystallization behavior; ceramic composite
