Patent ID: 6808744
Filing Date: 2004-10-26
Classification: C03B,C30B,Y10T

Abstract:
A method for preparing a composite crucible for pulling up monocrystalline silicone, the crucible comprising an outer layer made of a carbon fiber-reinforced carbonaceous material having fine gaps between fibers on an inner surface, the fibers having a gas permeability of 0.5 cm/sec or more, and wherein the crucible comprises an inner vitrified quartz layer which is integral with the outer layer through the fine gaps, the method comprising:using a carbon fiber crucible as an outer circumferential part, supplying quartz powders on an inner surface of the carbon crucible while rotating it to be heated and malted; and vitrifying the quartz layer up to the inner surface of the carbon crucible to integrally form the quartz glass layer and the carbon crucible layer, thereby obtaining the composite crucible having a carbon fiber outer layer integrally formed with a quartz glass inner layer.