Patent ID: 6235120
Filing Date: 2001-05-22
Classification: C23C,Y10S

Abstract:
A semiconductor processing chamber for processing wafers at elevated temperatures comprising:a chamber enclosure;a material source operatively coupled to the chamber enclosure for forming a material layer on a semiconductor wafer processed within the chamber;a source of processing gas operatively coupled to the chamber enclosure for supplying a processing gas thereto; anda part contained within the chamber enclosure, the part having:an underlying part of a first material having a first coefficient of thermal expansion;an intermediate coating on the underlying part comprising a plurality of intermediate layers each intermediate layer having an intermediate coefficient of thermal expansion; anda surface layer on the intermediate coating, of a second material having a second coefficient of thermal expansion;wherein the intermediate coefficient of thermal expansion of each intermediate layer is between the first coefficient of thermal expansion and the second coefficient of thermal expansion, the surface layer is corrosion resistant to the processing gas; and a plurality of the intermediate layers are exclusive of both the first material and the second material.