Patent ID: 7128788

Claim:
A manufacturing apparatus of a buried insulating layer-type semiconductor silicon carbide substrate, comprising: a heating furnace in which an SOI substrate having a surface silicon layer of a predetermined thickness and having a buried insulator is placed and which has a heating means for heating the SOI substrate; and a gas supply means for supplying a variety of gases into this heating furnace; and an exhaust means for exhausting gases within the heating furnace to outside, wherein the manufacturing apparatus is configured to control the heating means and the gas supply means in order to increase an ambient temperature within said heating furnace up to between 1,200 and 1,405° C. while supplying a mixed gas of a hydrogen gas and of a hydrocarbon gas into said heating furnace so as to metamorphose said surface silicon layer of the SOI substrate into a single crystal silicon carbide thin film, in order to maintain the metamorphosing state for a period of time of between several minutes and several hours so as to deposit a carbon film on said single crystal silicon carbide thin film, in order to replace said mixed gas with an inert gas wherein an oxygen gas is mixed in a predetermined ratio and heat said SOI substrate up to 550° C. or higher so as to remove said carbon thin film through etching.