Oxidation Behavior of Ni Aluminides Using X-ray Absorption Spectroscopy

Autor:	R.B. Greegor, F.W. Lytle
Rok vydání:	1990
Předmět:	X-ray absorption spectroscopy chemistry.chemical_compound Materials science chemistry Non-blocking I/O Oxide Analytical chemistry Aluminide Layer (electronics)
Zdroj:	MRS Proceedings. 213
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-213-957
Popis:	XAS was used to investigate the oxidation behavior of Ni3Al aluminides with and without the addition of Cr. At 450 C the Cr formed a Cr2O3 like oxide layer which inhibited the oxidation of the Ni at the surface. Ni oxidation did occur in the sample without Cr at 450 C. At higher temperatures the Ni at the surface oxidized to NiO, but in the bulk no oxidation of the Ni was observed whether Cr was present or not. When no Cr was present a minimum was observed at 700 C in the fraction of oxidized Ni. The Cr (8at.%) did not cluster and substituted for Ni or Al in the Ni3Al aluminide.
Databáze:	OpenAIRE
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