### The oxidation resistance of Nb-20Mo-15Si-5B-20Cr up to 1,300°CThe oxidation resistance of Nb-20Mo-15Si-5B-20Cr up to 1,300°C

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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