METHOD OF MAKING DENSIFIED SI3N4/OXYNITRIDE COMPOSITE WITH PREMIXED SILICON AND OXYGEN CARRYING AGENTS

摘要

PCT No. PCT/US83/01116 Sec. 371 Date Jul. 19, 1983 Sec. 102(e) Date Jul. 19, 1983 PCT Filed Jul. 19, 1983.A method is disclosed for making a more densified silicon nitride comprising object under less stringent heating conditions without sacrificing physical properties. A mixture of silicon powder, 6-18% yttrium silicon oxynitride (a major proportion of which is the Y10Si6O24N2 phase), 0.4-3% Al2O3, and possibly up to 2% of an oxynitride forming oxide (Y2O3) is compacted, nitrided, and sintered to produce a silicon nitride/YSiO2N comprising object of relatively high density.