SiO_2-Al_2O_3-ZrO_2玻璃的热相转变研究  

Thermal phase transformation of SiO_2-Al_2O_3-ZrO_2 glass

作　　者：谭小平[1] 梁叔全[1] 

机构地区：[1]中南大学材料科学与工程学院有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第1期51-55,共5页Journal of Central South University:Science and Technology

基　　金：国家"863"计划(2003AA332040);国家自然科学基金创新群体项目(50721003)

摘　　要：采用拉曼光谱和红外光谱结合x线衍射和透射电子显微镜等技术探讨SiO2-A12O3-ZrO2（SAZ）玻璃的热相转变过程。研究结果表明：SAZ玻璃经900℃热处理2h后仍为典型非晶，其拉曼峰位于460，600和800cm-1左右，峰形宽，强度弱，从900～920℃开始分相，形成富si区和富zr和Al区，拉曼峰强度随温度升高而增大，且在148cM-i叫和300cm叫附近出现2个峰值；当温度升高至1000℃时，四方氧化锆拉曼特征峰已很明显，表明四方氧化锆已形成，且在XRD谱中观察到A1．si尖晶石相并有莫来石晶相开始生成；当温度进～步升高时，四方氧化锆的拉曼峰更明显，同时在180～270，350～440和970～1020cml区域问出现拉曼峰，峰形尖锐，强度大，表明结晶完好；XRD谱中A1-si尖晶石相消失，四方氧化锆、莫来石成为主晶相，同时生成了少量方石英。The thermal phase transformation of SiO2-A12O3-ZrO2 （SAZ） glass was investigated by Raman, IR, XRD and TEM techniques. The results show that the sample heated at 900 ℃ is still in amorphous and the Raman peaks are broad and weak around about 460, 600 and 800 cm1. Phase segregation occurs at 900-920 ℃, resulting in the formation of Si-rich and A1, Zr-rich regions. The Raman peaks are stronger and there are two additional peaks around about 148 and 300 cm 1 with the increase of the temperature. The t-ZrO2 has been crystallized from the A1, Zr-rich region of the SAZ glass because of the obvious Raman peaks and A1-Si spinel is observed by XRD at 1 000 ~C when mullite forms by reaction between AI-Si spinel and amorphous silica. Above 1 000 ~C, the Raman peaks occur strongly at 180--270, 350-440 and 970-1 020 cm-1 expect for those of t-ZrO2 and the main crystalline phases are identified as t-ZrO2, mullite and cristobalite with the spinel disappearing.

关 键 词：SiO2-Al2O3-ZrO2玻璃 相演变 拉曼光谱 

分 类 号：TQ171[化学工程—玻璃工业]