Construction and validation of master sintering curve for TiO2 for pressureless sintering

Abstract

One of the ultimate objectives for sintering research is to predict densification results under different thermal profiles for a given processing method. This paper studies the construction and validation of the master sintering curve (MSC) for rutile TiO₂ for pressureless sintering. The MSC was constructed using dilatometry data at two heating rates and was then validated using isothermal holds at three different temperatures. The scanning electron microscopy (SEM) observation shows that the partially sintered samples have the same density under different heating procedures, which demonstrates that the assumptions of the model are reliable. The concept of the MSC could be used to predict the sintering shrinkage and final density and calculate the activation energy. A value of 105 kJ mol^-1 for TiO₂ was obtained. The MSC could be applied to predict the sintering profile to prepare ceramics with required density and a minimum of grain growth.     

局部放电图像组合特征提取方法

研究了局部放电图像组合识别特征提取和反向传播算法神经网络分类器设计方法 ,根据变压器局部放电在线监测的要求 ,设计了 5种放电模型并进行了模拟实验。 5种放电模型数据识别结果说明 :与分别采用分形特征和统计特征的识别结果相比 ,采用两者组合的识别特征集具有更高的识别率