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 specimens of O-phase Ti-22Al-25Nb (at%) intermetallics coated with silica-basedenamel received mass gains of about 1 mg/cm2, after 300 h of oxidation or hot corrosion at 800 °C.These rates were much faster than the growth rates of silica films at the same temperature. Tounderstand this phenomena, the specimens were analyzed using SEM, XRD, EPMA and TEM. Anoxide layer with thickness of several μm was observed at the enamel/substrate interface of the coatedspecimens after either oxidation or hot corrosion. XRD and TEM analysis revealed the newly formedoxide layer was composed of α-Al2O3, Al2SiO5, Al2TiO5, rutile-TiO2 and NbO2. It was shown byEPMA profiling that an Al-depleted zone was located just beneath the oxides. It was proposed thatthe solid reactions between the enamel coating and the O-phase Ti-Al-Nb played important roles forthe oxidation and hot corrosion behavior of the coated specimens
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.595-598.233.pdf
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