Patent ID: 6113692
Filing Date: 2000-09-05
Classification: C30B

Abstract:
A process for forming an SiC ingot in an apparatus comprising a crucible having;a first enclosure defined by a bottom, a cover and at least one interior sidewall and in which a SiC nucleus is positioned, each of the three crucible components being formed from a material selected from the group consisting of graphite, TiC, HfC, TaC and MoC; a SiC powder reservoir located within the first enclosure which provides a first SiC source; a second exterior sidewall, said first interior wall and said second exterior wall defining a clearance which is filled with SiC as a second SiC source; and a means for establishing at least one temperature gradient between the SiC nucleus and the first and second SiC sources, the process, comprising:a) placing said SiC nucleus in said first enclosure;b) forming a vacuum within said first enclosure;c) cleaning said nucleus; andd) growing a body of SiC on said nucleus.