Al/sub 2/O/sub 3/ adherence on CoCrAl alloys
Adherence of protective oxides on NiCrAl and CoCrAl superalloys has been promoted by a dispersion of a highly oxygen reactive element or its oxide being produced within the protection system. Two aspects of this subject are investigated here: the use of Al/sub 2/O/sub 3/ as both the dispersion and protective oxide; and the production of an HfO/sub 2/ dispersion while simultaneously aluminizing the alloy. It was found that an Al/sub 2/O/sub 3/ dispersion will act to promote the adherence of an external scale of Al/sub 2/O/sub 3/ to a degree comparable to previously tested dispersions and an HfO/sub 2/ dispersion comparable to that produced by a Rhines pack treatment is produced during aluminization.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5188197
- Report Number(s):
- LBL-10952
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ADHESION
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
COBALT BASE ALLOYS
CREEP
DEPOSITION
FATIGUE
GAS TURBINES
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
MACHINERY
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
360104* -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ADHESION
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
COBALT BASE ALLOYS
CREEP
DEPOSITION
FATIGUE
GAS TURBINES
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
MACHINERY
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY