0.6Ca0.61La0.26TiO3-0.4La(Mg0.5Ti0.5)O3介质陶瓷微波烧结的晶粒生长动力学研究  

Grain Growth Kinetics of 0.6CaLaTiO-0.4La(MgTi)O Dielectric Ceramics by Microwave Sintering

作　　者：刘锦 梁炳亮[1] 方财生 何文[1] 张建军[1] 艾云龙[1] LIU Jin;LIANG Bingliang;FANG Caisheng;HE Wen;ZHANG Jianjun;AI Yunlong(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《人工晶体学报》2020年第7期1300-1307,共8页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51664043,51802140);国家留学基金委(201708360036)。

摘　　要：采用微波烧结制备了0.6Ca0.61La0.26TiO3-0.4La(Mg0.5Ti0.5)O3[0.6CLT-0.4LMT]陶瓷,研究烧结工艺对其显微结构和晶粒生长行为的影响,并采用线性回归方法建立了Hillert模型和Sellars简化模型,采用非线性回归方法建立了具有时间指数的Sellars-Anelli模型。结果表明,随着烧结温度的升高、保温时间越长,晶粒尺寸越大,且烧结温度对晶粒生长的影响更为明显。对三种模型预测的晶粒尺寸与实验结果的平均晶粒尺寸进行了误差分析,发现Hillert模型对该陶瓷的预测精度最低,Sellars-Anelli模型对该陶瓷的预测精度最高。由Sellars-Anelli模型得到的0.6CLT-0.4LMT陶瓷的晶粒生长动力学方程为d^4.718=d0^4.718+4.516×10^33×t^0.888×exp[-1 059 682/(RT)],能够有效预测0.6CLT-0.4LMT陶瓷微波烧结的晶粒生长过程。0.6 Ca0.61La0.26TiO3-0.4 La(Mg0.5Ti0.5)O3[0.6 CLT-0.4 LMT] ceramics were prepared by microwave sintering. The effect of sintering process on its microstructure and grain growth behavior was studied. A Hillert model and Sellars simplified model was established by linear regression, and a nonlinear regression method was used to establish the Sellars-Anelli model with time index. The results show that with the increase of sintering temperature and the increase of holding time, the grain size is larger, and the effect of the sintering temperature on the grain growth is more obvious. The grain sizes predicted by the three models and the experimental results were analyzed. It is found that the Hillert model has the lowest prediction accuracy for the ceramic, and the Sellars-Anelli model has the highest prediction accuracy for this ceramic. The Sellars-Anelli model is d^4.718=d0^4.718+4.516×10^33×t^0.888×exp[-1 059 682/(RT)], which can effectively predict the grain growth process of 0.6 CLT-0.4 LMT ceramic by microwave sintering.

关 键 词：微波烧结 介质陶瓷 线性回归 非线性回归 晶粒生长 生长动力学模型 

分 类 号：TQ174[化学工程—陶瓷工业]