Method for altering the composition and structure of...

Details Method for altering the composition and structure of... Method for altering the composition and structure of...

C - Chemistry, Metallurgy

23

C

117/74, 204/96.0

C23C 14/32 (2006.01) C23C 14/02 (2006.01) C23C 14/16 (2006.01)

Patent

CA 1128820

ABSTRACT OF THE DISCLOSURE The composition and structure of aluminum bearing overlay alloy coatings, such as MCrAlY type overlay coatings, are altered during deposition from a metallic vapor by biasing the substrate at a small negative poten- tial relative to ground while the vapor is at least partially ionized. The coating layer deposited under such conditions is characterized by substantial freedom from leader defects and by a reduced aluminum content and resultant improved ductility. Such coating condi- tions can be incorporated in a preselected manner into conventional deposition techniques, such as vacuum vapor deposition and sputtering, to produce a variety of coating compositional and structural variations from a single coating alloy ingot source.

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