초록 ▼

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

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.

대표청구항 ▼

In a method of making a densified silicon nitride comprising object, wherein silicon powder is subjected to sequential heating including first a nitriding heating to form silicon nitride and second a heating to fuse the resulting silicon nitride, the improvement comprising having yttrium silicon oxy

In a method of making a densified silicon nitride comprising object, wherein silicon powder is subjected to sequential heating including first a nitriding heating to form silicon nitride and second a heating to fuse the resulting silicon nitride, the improvement comprising having yttrium silicon oxynitride present with said silicon or silicon nitride prior to said heating to fuse, a major proportion of the yttrium silicon oxynitride is of the Y10Si6O24N2 phase, said yttrium silicon oxynitride serving to dissolve said silicon nitride during said second heating to fuse and to convert to a more stable phase as a result of the second heating to fuse.