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Title: 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.
Authors:
Publication Date:
OSTI Identifier:
5188197
Report Number(s):
LBL-10952
TRN: 80-015357
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Research Org:
California Univ., Berkeley (USA). Lawrence Berkeley Lab.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; SURFACE COATING; HAFNIUM OXIDES; ALUMINIUM ALLOYS; OXIDATION; SURFACE PROPERTIES; CHROMIUM ALLOYS; COBALT BASE ALLOYS; NICKEL BASE ALLOYS; ADHESION; CREEP; FATIGUE; GAS TURBINES; PROTECTIVE COATINGS; ALLOYS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; COATINGS; COBALT ALLOYS; DEPOSITION; HAFNIUM COMPOUNDS; MACHINERY; MECHANICAL PROPERTIES; NICKEL ALLOYS; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TURBINES; TURBOMACHINERY 360104* -- Metals & Alloys-- Physical Properties; 360105 -- Metals & Alloys-- Corrosion & Erosion