助烧剂添加量对AlN微波烧结陶瓷微结构的影响研究

Study on the Influence of Additive Amount on Microstructure of AlN Ceramic Prepared by Microwave Sintering Method

本文分别以Y2O3、CaO、Dy2O3、Nd2O2与Sm2O3为助烧剂,利用微波烧结法制备了AlN陶瓷,并分析了助烧剂添加量对陶瓷样品微结构的影响。研究结果发现,当以Y2O3为助烧剂时所得陶瓷几近完全致密,且其添加量对陶瓷晶粒与晶界的形态有较大影响;当以CaO为助烧剂时,添加量较小时所得陶瓷中孔洞也很少,添加量较大时会在陶瓷中出现大孔洞;当以Dy2O3与Nd2O2为助烧剂时所得陶瓷相当致密且没有孔洞存在;当以Sm2O3为助烧剂时,添加量较小时陶瓷相当致密且没有孔洞存在,而添加量较大时会出现少量孔洞;其中以Nd2O2与Sm2O3为助烧剂时会有穿晶现象发生。

The AlN ceramics with different sintering additives of Y2O3 .CaO.Dy2O3 .Nd2O2 and Sm2O3 were prepared by the microwave sintering method and the influence of additive amount on microstruc- ture of these AlN ceramics was analyzed in this thesis. The studied results showed that all the ceramic samples are almost fully dense and the morphologies of grain boundary and ceramic grain are not influ- enced by the additive amount for Y2 O3 as the sintering additive. The additive amount less, the hole smaller and the additive amount more, the hole larger in ceramics for CaO as the sintering additive. The prepared ceramics are very dense and have no hole for Dy2O3 and Nd2O2 as the sintering additives. For Sin2O3 as the sintering additive, the ceramic samples are very dense and have no hole at less addi- tive amount and have little holes at more additive amount. The transcrystalline phenomenon can be produced for Nd2O2 and Sin2O3 as the sintering additives.