MgO助剂对Al_2O_3陶瓷烧结的增强机制研究

Study on Sintering Techniques of Al_2O_3 Ceramics with MgO Additive

通过添加一定比例的MgO作为烧结助剂,研究常压条件下MgO对Al_2O_3晶粒烧结过程的变化情况。本研究工作主要通过两组MgO比例及关键温度点的时间控制实验,来考察Al_2O_3晶粒的烧结状况。对样品进行了体积密度、硬度、表面形貌和晶体结构测试。实验表明,0.8wt%MgO助剂和关键点温度的保持,使MgO助剂烧结生成物MgAlO_4在起到钉扎作用的同时,可以填充Al_2O_3晶粒形成的空隙,MgAlO_4小晶粒的钉扎和填充,共同成为Al_2O_3陶瓷的增强机制。

Effect of MgO sintering additives on crystal particle controlling of Al2O3 ceramic. Two different MgO component and Two different heat preservation times were set in this experiment, and researched the crystal particle sintering. Volume density,hardness,surface mor- phology and crystal structure were measurement. The results revealed that the MgAlO4 can play the role of Pinning effect and filling of gap between grains by 0.8wt % MgO additives and sintering temperature controlling, and enhance the performance ofAl2O3 ceramic.