亚微米级α-Al_2O_3陶瓷恒速无压主烧结曲线的建立  

Construction of Master Sintering Curve for Submicron-size α-Al_2O_3 during Pressureless Sintering at Constant Heating Rates

作　　者：邵渭泉[1] 陈沙鸥[1] 曹红诗[1] 李达[1] 张永成[1] 孙旭辉[1] 

机构地区：[1]青岛大学物理科学学院,青岛266071

出　　处：《材料导报》2008年第9期131-134,共4页Materials Reports

基　　金：青岛市自然科学基金(05-1-JC-89)

摘　　要：主烧结曲线对于预测陶瓷的烧结行为非常有用,以主烧结曲线理论为基础,对亚微米级α-Al2O3(平均粒径为350nm)的恒速无压烧结行为进行了研究。根据Hansen提出的全期烧结模型,结合低升温速率条件下热膨胀仪记录的烧结数据建立了α-Al2O3的主烧结曲线,并由此得到其烧结过程中的表观激活能为1035kJ/mol。为验证所建立主烧结曲线的有效性,对同批次坯体样品进行不同路径的烧结,用Archimedes法实测烧结体密度,所测结果与主烧结曲线预测的结果相一致,从而证明了所建立主烧结曲线的有效性。因此亚微米级α-Al2O3主烧结曲线对烧结路径不敏感,可以对样品收缩率和最终相对密度进行预测,反之,根据目标相对密度可以制定相应的烧结制度。The master sintering curve （MSC） is quite useful for predicting the sintering behavior of ceramics. In this study, the pressureless sintering behaviors of submicron-size α-Al2O3 with the mean particle size of 350nm at constant heating rates are evaluated based on the MSC theory. Based on the combined-stage sintering model, the MSC of α-Al2O3 is constructed during pressureless sintering at constant heating rates in a dilatometer. The relative density of the sample is measured using the Archimedes method. The MSC of submicron-size α-Al2O3 samples is validated under different thermal histories, The concept of the MSC is used to evaluate the apparent activation energy of the above powder, and a high value of 1035kJ/mol is obtained. The MSC, in which the sintered density is an unique function of the integral of a temperature function over time, is insensitive to the heating path. According to the MSC of α-Al2O3, it is possible to predict the sintering shrinkage and final density, On the other hand, if the desired density is known, it is possible to find out the corresponding Θ value from the abscissa of MSC and thereafter to make the sintering schedule.

关 键 词：全期烧结模型 主烧结曲线 恒速无压烧结 Α-AL2O3 

分 类 号：TQ174[化学工程—陶瓷工业]