Patent ID: 9322112
Filing Date: 2016-04-26
CPC Classification: C30B,Y10T

Claim Text:
1. An apparatus for producing a SiC single crystal comprising: a container which holds a SiC solution, an induction coil for maintaining said SiC solution in said container at a suitable temperature, a holding shaft which has a lower end part for holding a SiC seed crystal in a state in planar contact with an overall back surface of a crystal growth face and for cooling said SiC seed crystal, and wherein a position of said holding shaft is controlled for enabling the SiC single crystal to continuously grow at said crystal growth face by maintaining said crystal growth face in a state brought into contact with said SiC solution, wherein said holding shaft is provided with a supply channel and a return channel for a cooling fluid which extend to said lower end part through a body of said holding shaft along its length direction, said lower end part of said holding shaft forms a hollow body surrounded by a bottom part which holds said SiC single crystal in planar contact with its outside and side walls which rise from peripheral edges of said bottom part and connect to said body of said holding shaft, so that said cooling fluid which is sprayed from said supply channel into said hollow body strikes said bottom part and cools said SiC single crystal through said bottom part and passes through said return channel to be discharged from said hollow body, and said bottom part of said hollow body is reduced in thickness from the center part where said cooling fluid from said supply channel strikes toward the peripheral edges toward said return channel.