Polyphase ceramic bodies mfr. - based on zirconia and mullite with additions of oxide(s) of magnesium, calcium and titanium by reaction sintering

摘要

Polyphase ceramics are mfd. by reaction sintering that comprises (a) mixing powders of zircon and alumina in proportions 10-63 % zircon, 90-27 % Al2O3; (b) incorporating into the mixt. a cpd. bringing into the mixt. at the reaction temp. 0.5-20 wt. % wrt. the above mixt. of an oxide of Mg, Ca or Ti, ensuring reaction of the mixt. at the densification temp.; (c) shaping the mixt.; and (d) heating the shaped mixt. to the reaction temp. of the components and holding the temp. constant until completion of reaction and densification. - The additive oxides lower the reaction temp. and favour densification of the product while also providing new ceramic compositions with mixed phases based on the mullite-zirconia ceramic obtd. by reacting Al2O3 and zircon.(0/5)