ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The 4th and advanced generation Ni-base single crystal superalloys, which contain largeamounts of refractory metals for strengthening and platinum group metals, e.g., Ru, for TCP-phaseprevention, show excellent high-temperature strengths. However, these alloying elements seem todecrease high-temperature oxidation resistance. In this study, Ni-base superalloys with variousamounts of Ta, Re and Ru were examined in isothermal and cyclic exposures at 1373K to investigatethe effect on the oxide growth rate and resistance to scale spallation. Structures of the oxide for thealloys were analyzed by XRD, SEM and EDX, and the oxidation kinetics is discussed. Ru and Rewere found to degrade the oxidation resistance by the vaporization of their oxide. Ta-rich oxide in thespinel layer affects to stabilize ruthenium and rhenium oxide in the scale and improve the oxidationresistance of Ru-containing Ni-base superalloys
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.317.pdf
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