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CaF2-Y2O3二元烧结助剂,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.
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.
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