Patent ID: 6837966

Claim:
An improved baffle plate in a plasma processing system comprising: a ring comprising an upper surface, a lower surface, an inner radial edge coupled to said upper surface and said lower surface, an outer radial edge coupled to said upper surface and said lower surface, and at least one passageway coupled to said upper surface and to said lower surface and configured to permit the flow of a gas therethrough, wherein said upper surface comprises a first mating surface proximate said outer radial edge, said lower surface comprises a second mating surface proximate said outer radial edge and a plurality of fastener mating surfaces proximate said inner radial edge, and each of said at least one passageway comprises an internal passageway surface; and a protective barrier coupled to a plurality of exposed surfaces of said baffle plate, wherein said exposed surfaces comprise said upper surface excluding said first mating surface, said lower surface excluding said second mating surface and said plurality of fastener mating surfaces, and said internal passageway surface of each of said at least one passageway.