They used a method that mixes small amounts of silicon with silicon dioxide, silicon carbide, or silicon nitride.
Extrusion of alumina-silicon carbide whisker composites.
The company designed computer modeling methods to simulate silicon carbide semiconductors under extreme conditions.
British Dictionary definitions for silicon carbide
an extremely hard bluish-black insoluble crystalline substance produced by heating carbon with sand at a high temperature and used as an abrasive and refractory material. Silicon carbide whiskers have a high tensile strength and are used in composites; very pure crystals are used as semiconductors. Formula: SiC