中文摘要：

采用湿化学法,将异丙醇铝盐与有机碳源蔗糖混合,在一定温度及pH值下制成干凝胶,然后在高温下将干凝胶中的铝盐与碳源进行化学分解,并通过碳热还原发生氮化反应,制得中位粒径约为1.0μm,含氧量低、无杂相的超细AlN粉体。最后,通过添加CaF_2-Y_2O_3二元烧结助剂,利用无压烧结技术成功制得相对密度超过99.0%,热导率〉180 W/（m·℃）的AlN陶瓷。

英文摘要：

The wet-chemical method is proposed for the preparation of a binary carbonaceous aluminium xerogel by using aluminium isopropoxide and sucrose as the raw materials at a given temperature and pH value. AlN ul- trafine powders with diameters less than 1.0 micron were prepared by chemical decomposition of aluminum and carbon sources in xerogel at high temperature and carbon-thermal reduction. The as-prepared powders were pure and had low oxygen content. Finally, by adding a CaF2-Y2O3 binary sintering additives and using pressureless sintering technology, the compact AlN ceramics with high-thermal conductivity were prepared successfully. The relative density and thermal conductivity of AlN ceramics sintered at 1 800 ℃ are above 99% and 180 W/（m·℃） respectively.