Effect of Al2O3 and enamel coatings on 900 degrees C oxidation and hot corrosion behaviors of gamma-TiAl

Citation
Zl. Tang et al., Effect of Al2O3 and enamel coatings on 900 degrees C oxidation and hot corrosion behaviors of gamma-TiAl, MAT SCI E A, 276(1-2), 2000, pp. 70-75
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
0921-5093 → ACNP
Volume
276
Issue
1-2
Year of publication
2000
Pages
70 - 75
Database
ISI
SICI code
0921-5093(20000115)276:1-2<70:EOAAEC>2.0.ZU;2-N
Abstract
The effect of reactively sputtered Al2O3 and enamel coatings on oxidation a nd hot corrosion behaviors of TiAl was investigated at 900 degrees C. Isoth ermal oxidation testing indicated that both coatings were very effective in reducing the oxidation rate of gamma-TiAl. Cyclic oxidation testing indica ted that reactive-sputtered Al2O3 coating had little effect in improving th e cyclic oxidation resistance of TiAl due to the spallation of Al2O3 coatin g. However enamel coating exhibited an excellent positive effect on cyclic oxidation of TiAl. Enamel coating was very adherent to substrate and neithe r cracks nor spallation appeared in the coatings during cyclic oxidation. F urthermore, the hot corrosion behavior of TiAI with enamel coating was eval uated in (Na,K)(2)SO4 melts at 900 degrees C. The results showed that ename l coating was very stable in (Na,K)(2)SO4 melts and was very effective in p rotecting TiAI from hot corrosion attack. (C) 2000 Elsevier Science S.A. Al l rights reserved.