利用含Al(NO3)a,Y(NO3)3和尿素的水溶液中无机盐的沉淀再经煅烧在Si3N4粉料的表面包覆Y2O3-Al2O3层,作为氮化硅烧结的助烧剂.包覆层改变了Si3N4粉料的电动性和胶态特性,从而提高了Si3N4的分散性.研究表明,经包覆和凝胶注模成型的方法所制备的氮化硅烧结体较冷等静压方法所获得的烧结体的抗弯强度和Weibull模数都大大提高.
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