透明氮化铝陶瓷的制备

Preparation of Translucent AlN Ceramics

本文采用碳热还原法制得的 Ａｌ Ｎ 粉， 使用烧结剂 Ｃａ Ｃ２ ， 热压制备了透明氮化铝陶瓷实验证明， 纯度高、粒径较小、且均匀的 Ａｌ Ｎ 粉是制备透明 Ａｌ Ｎ 陶瓷的必要条件 Ａｌ Ｎ 陶瓷从紫外、可见光到近红外均透明， 显微结构研究表明， Ａｌ Ｎ 陶瓷透明是由于晶粒完整规则， 紧密排列， 晶界干净， 而气孔、晶粒内和晶界第二相杂质。

Translucent AlN ceramics were prepared by hot pressing with AlN powder synthesized by using carbon thermal reducing method and additive CaC 2 The experiments show that the AlN powder with high purity, small particle size and narrow size distribution is necessary for translucent AlN ceramics CaC 2 is an effective sinteringadditive for translucent AlN ceramics, improving the densification of AlN and evaporating cleaning the grain boundary The product is translucent in the rangeof ultraviolet to infrared The microstructure study shows that the translucentreason is the grains of AlN complete growing and closely arranging