用湿化学方法,通过非均匀成核方式将烧结助剂Al2O3,Y2O3均匀包覆到纳米SiC及Si3N4颗粒表面.经烧结助剂表面包覆修饰后的SiC,Si3N4粉体表现出相似的胶体特性,其等电点IEP分别从pH=3.4,pH=4.4移至pH=8.6,pH=9.2.在pH=7.5时,被覆烧结助剂的SiC,Si3N4颗粒都具有较高的Zeta电位正值,具有良好的分散性.然后,通过胶态悬浮液混合,将纳米SiC均匀分散到Si3N4基体中.从而实现纳米复相陶瓷中各相的均匀混合.实验结果表明,用湿化学方法制备的Si3N4/SiC纳米复相陶瓷材料具有较均匀的显微结构、良好的烧结性能和力学性能.
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