The effect of water vapor on the oxidation behavior of Ni-Pt-Al coatings and alloys |
| |
Authors: | BA Pint JA Haynes KL More |
| |
Affiliation: | a Metals and Ceramics Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, P. O. Box 2008, M.S. 6156, Oak Ridge, TN 37831-6156, United States b Department of Mech. Eng., Tennessee Technological University, P. O. Box 5014, Cookeville, TN 38505-0001, United States |
| |
Abstract: | Turbines fired with hydrogen or syngas from coal gasification will have significantly higher water vapor contents in the combustion gas than natural gas fired turbines. The effect of increased water vapor on alumina-forming coatings and model alloys was investigated at 1100 °C in furnace cyclic testing. Increasing the water vapor content from 10% to 50 vol.% increased the amount of scale spallation on undoped alumina-forming alloys. Compared to dry O2, increased spallation was observed for β and γ/γ' phase coatings on the substrates of alloys 142 and N5. In all cases, the addition of water vapor appeared to reduce the formation of alumina whiskers and ridges at the scale-gas interface, but did not significantly change the alumina growth rate. The addition of water vapor may have a detrimental effect on the selective oxidation of Al in γ/γ' alloys and coatings. |
| |
Keywords: | Aluminum oxide Water vapor High temperature oxidation Platinum Chemical vapor deposition TEM |
本文献已被 ScienceDirect 等数据库收录! |
|