Patent ID: 8273291
Filing Date: 2012-09-25
Classification: B22F,C21D,C22C

Abstract:
1. A controlled combustion synthesis process comprising: introducing, into a reaction container within an apparatus forming an enclosure, a starting material comprising a mixture including silicon powder, aluminum, and one or more substances from the group consisting of alumina and silica; exhausting air from said apparatus; supplying nitrogen to said apparatus from the exterior thereof by means of a nitrogen feed system including a gas pressure control valve; detecting the internal pressure within said apparatus by means of a pressure sensor, and thereby determining the quantity of nitrogen in said apparatus; initiating a reaction in said starting material by igniting said starting material, by means of at least one ignition system, when a predetermined quantity of nitrogen has been introduced into said apparatus as determined by said pressure sensor; detecting the internal temperature of the reaction container by temperature detection means; and controlling said reaction by: whereby combustion synthesis of a silicon alloy is carried out while maintaining the internal pressure within said apparatus and the temperature of said reaction container at specified values.