粉体制备工艺对Mg0-PSZ热膨胀特性的影响  

The Effect of the Preparation of Powder on the Thermal Expansion Behavior of MgO-PSZ

作　　者：曾艳[1] 谢光远[2] 陈潜[3] 胡文超[3] 高玉[3] 

机构地区：[1]武汉科技大学材料与冶金学院 [2]武汉科技大学金材系 [3]湖北省武汉科技大学金材系

出　　处：《传感器世界》2008年第6期10-13,共4页Sensor World

基　　金：湖北省自然科学基金资助项目(编号:2004ABA078)

摘　　要：采用热膨胀仪研究了实验室制得的MgO-PSZ陶瓷的热膨胀特性。以直接共沉淀复合掺入CeO2、Y2O3和CaO的MgO-PSZ经一定条件热处理后,在550～950℃低温范围发生了单斜相→四方相相变。这一低温相变降低了MgO-PSZ的热膨胀系数,伴随相变产生的体积收缩与试样受热时的体积膨胀发生抵消,使试样表现出零膨胀特性,从而改善了材料的抗热震性。The thermal expansion characteristics of MgO-PSZ prepared in laboratory are studied by a thermal expansion instrument. It is founded that the phase transformation from monoclinic to tetragonal takes place at a low-temperature range in 550-950~C when the MgO-PSZ ceramic codoped with CeO2, Y2O3 and CaO directly in coprecipitation was treated at a certain condition.The low-temperature phase transformation has reduced the thermal expansion coefficient of MgO-PSZ and the decrease of volume changes associated with the phase transformation offsets the sample＇s expansion,which contributes to the sample＇s zero expansion characteristics and the improvement of thermal shock resistance of MgO-PSZ.

关 键 词：复合掺杂 热膨胀 抗热震性 

分 类 号：TB383.3[一般工业技术—材料科学与工程]