METHOD FOR PRODUCING COMPOSITE ceramic powders based on silicon nitride and zirconium dioxide and the feedstock FOR IMPLEMENTATION

摘要

1. A process for preparing a composite ceramic powder based on silicon nitride and zirconia in the combustion mode in a nitrogen environment at high pressure, comprising mixing the mixture components, consisting of nitridobrazuyuschego and oxide-containing components, silicon nitride, and an ammonium halide, characterized in that as nitridobrazuyuschego and oxide-containing components used previously ground to a particle size not 0.1 mm ferrosilicon and zircon concentrate in an amount of 40-50 and 20-50 wt.%, respectively, mixing them with silicon nitride and ammonium fluoride in an amount of 0.5-1.0, and 10-30 wt.%, respectively, the combustion reaction is initiated locally at a nitrogen pressure of 2-20 MPa, is carried out in doazotirovanie volume combustion mode at a nitrogen pressure of 0.1-10 MPa for 0.5-1.0 hours, the cooled product is ground to a particle size less than 0.04 mm and subjected to magnetic separation, then treated with 15-30% hydrochloric kisloty.2. A method according to claim 1, characterized in that the ferrosilicon contains 65-95 wt.% Kremniya.3. A method according to claim 1, characterized in that the zircon concentrate comprises 60-70 wt.% Tsirkoniya.4 dioxide. The charge for the preparation of a composite ceramic powder based on silicon nitride and zirconia, and comprising nitridobrazuyuschy oxide-containing ingredients, characterized in that it contains as component nitride ferrosilicon with a silicon content of 65-95 wt.%, As a component oksidobrazuyuschego zirconium dioxide concentrate with 60-70 wt% zirconia, silicon nitride and ammonium fluoride with the following ratio of wt.%.: