Patent ID: 8129029
Filing Date: 2012-03-06
Classification: C23C,H01J,Y10T

Abstract:
1. An article which is resistant to corrosion or erosion by chemically active plasmas, said article comprising: a metal or metal alloy substrate comprising a metal selected from the group consisting of yttrium, neodymium, samarium, terbium, dysprosium, erbium, ytterbium, scandium, hafnium, niobium and combinations thereof, and at least one dopant selected from the group consisting of zirconium oxide, hafnium oxide, scandium oxide, niobium oxide, samarium oxide, ytterbium oxide, erbium oxide, cerium oxide, neodymium oxide, terbium oxide, dysprosium oxide, and combinations thereof; and an oxide coating which is a thermal oxide of said metal or metal alloy including said at least one dopant, wherein a structure of said oxide coating is columnar in nature, wherein a grain size of crystals in said oxide coating is larger at an exposed surface of said oxide coating than at an interface between said oxide coating and said metal or metal alloy substrate, and wherein said oxide coating is in compression at said interface between said oxide coating and said metal or metal alloy substrate.