High-temperature coating for titanium aluminides using the pack-cementation technique

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Oxidation of Metals; (USA)

DOI:https://doi.org/10.1007/BF00665016· OSTI ID:6016593

Kung, Sicheng ^[1]

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1. Universal Energy Systems, Inc., Dayton, OH (USA)

The practical application of titanium aluminide metal-matrix composites (MMCs) at high temperatures requires suitable surface coatings to provide the needed oxidation resistance. Without a coating, the titanium aluminide alloys suffered from rapid oxidation attack at elevated temperatures, particularly under thermal cyclic conditions. The pack-cementation coating process was utilized to aluminize the surface region of a Ti{sub 3}Al-base alloy to TiAl{sub 3}, the most oxidation-resistant phase. With the existence of an adherent conversion coating, a thin protective alumina scale formed on the outer surface, and a significant improvement in the corrosion resistance was observed. Excellent coating efficiency and geometric flexibility were demonstrated in this study by the pack-cementation technique. Further development of the cementation process will focus on the elimination of surface cracking in the coating.

• OSTI ID: 6016593
• Journal Information: Oxidation of Metals; (USA), Journal Name: Oxidation of Metals; (USA) Vol. 34:3-4; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103 -- Internal Combustion Engines-- Turbine
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CHEMICAL REACTIONS
COATINGS
CORROSION PROTECTION
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
MACHINERY
MEASURING METHODS
MICROSCOPY
NUMERICAL DATA
OXIDATION
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
TITANIUM ALLOYS
TURBINES
TURBOMACHINERY