Patent ID: 6013321
Filing Date: 2000-01-11
Classification: C04B

Abstract:
A method for preparation of a material to be phosphate bonded to form a ceramic comprising:(a) mixing a metal oxide in a solid state with Si.sub.3 N.sub.4 in a solid state in a predetermined amount;(b) pressing the admixture into a green body;(c) determining the pore volume of said green body;(d) determining the amount of phosphoric acid required to react with said green body at a predetermined amount;(e) making an impregnation solution of phosphoric acid and a carrier liquid having a ratio of phosphoric acid to carrier liquid equal to the ratio of (a) the volume of phosphoric acid determined for the reaction; (b) a volume of carrier fluid equal to the pore volume of the green body minus the volume of the phosphoric acid determined for the reaction; and(f) impregnating said green body with said solution of phosphoric acid and carrier fluid.