Patent ID: 6540509
Filing Date: 2003-04-01
Classification: C23C,C30B,H01L

Abstract:
A heat treatment system wherein an object to be treated is carried in a reaction vessel, which has been pressure-reduced to a predetermined degree of vacuum by evacuating means and the interior of which is heated to a predetermined process temperature, and a process gas is supplied into said reaction vessel via a gas feed passage to process said object, said heat treatment system comprising:a heating part, provided in said gas feed passage, for heating said process gas to a predetermined temperature before said process gas is supplied to said reaction vessel; and an orifice formed in said gas feed passage between said heating part and said reaction vessel, wherein while the pressure in said heating part is higher than the pressure in said reaction vessel due to pressure loss at the orifice, said process gas is supplied into said heating part via said gas feed passage to preheat said process gas to a predetermined temperature to supply the preheated process gas to said reaction vessel.