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Author Ventura, Julieta ♦ Varma, S. K.
Source SpringerLink
Content type Text
Publisher Springer US
File Format PDF
Copyright Year ©2009
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword Earth Sciences ♦ Environment ♦ Physics ♦ Chemistry/Food Science ♦ Engineering ♦ Materials Science
Abstract Nb-20Mo-15Si-5B-20Cr alloy has been oxidized in air in a range of temperatures from 700 to 1,300°C. A 24 hour exposure to air shows a minimum in weight gain per unit area at 900 and 1,000°C. Below and above this temperature the alloy has an oxide scale composed of oxide-metal interface which has been characterized by x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and x-ray mapping. Formation of CrNbO$_{4}$ appears to be beneficial for the oxidation resistance while another Cr oxide, Cr$_{2}$O$_{3}$, may form mainly at temperatures below 1,000°C. SiO$_{2}$ formation has been restricted to temperatures above 1,000°C. Long term oxidation consisting of seven successive 24 hour cycles of heating shows better oxidation resistance at 1,300°C for times longer than 96 hours but below that usual lower weight gain per unit area at lower temperature has been observed.
ISSN 10474838
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2009-07-09
Publisher Institution The Minerals, Metals & Materials Society (TMS)
Publisher Place Boston
e-ISSN 15431851
Journal JOM
Volume Number 61
Issue Number 7
Page Count 4
Starting Page 72
Ending Page 75

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Source: SpringerLink