Isothermal oxidation behavior and microstructure of plasma surface Ta coating on γ-TiAl

Journal Article · Mon Dec 15 00:00:00 EST 2014 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2014.10.014· OSTI ID:22403601

Song, Jian; Zhang, Ping-Ze; Wei, Dong-Bo; Wei, Xiang-Fei; Wang, Ya

The oxidation behavior of γ-TiAl with Ta surface coating fabricated by double glow plasma surface alloying technology was investigated by thermogravimetric method. Oxidation experiments were carried out at 750 °C and 850 °C in air for 100 h. The modification layer was comprised of deposition layer and diffusion layer, which metallurgically adhered to the substrate. Tantalum element decreased with the case depth. The oxidation morphology was studied by a scanning electron microscope and X-ray diffraction. The results highlighted that in the oxidizing process of the oxidation, the phase containing Ta-richer may restrain diffusing outward of the element Al in the matrix. Ti diffused outward, and formed the TiO{sub 2} scales, while the middle layer was rich in Al, and formed the continuous Al{sub 2}O{sub 3} scales after oxidation, which was effective to prevent further infiltration of oxygen atoms, and as a result the oxidation resistance increased immensely. - Highlights: • A Ta modified coating was prepared on γ-TiAl using DGP surface alloying technology. • The modification layer metallurgically adhered to the substrate. • The bonding force is about 60 N, satisfying the demands of practical use. • The oxidation resistance increased immensely at 750 °C and 850 °C.

• OSTI ID: 22403601
• Journal Information: Materials Characterization, Vol. 98; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
ALUMINIUM OXIDES
DEMAND
INTERMETALLIC COMPOUNDS
LAYERS
MATRIX MATERIALS
MICROSTRUCTURE
MORPHOLOGY
OXIDATION
PLASMA
SCANNING ELECTRON MICROSCOPY
SUBSTRATES
SURFACE COATING
SURFACES
TANTALUM
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM
TITANIUM OXIDES
X-RAY DIFFRACTION