{"title":"Non-selective oxidation of ZrAl3","authors":"M. Paljević","doi":"10.1016/0022-5088(91)90014-U","DOIUrl":null,"url":null,"abstract":"<div><p>The oxidation of ZrAl<sub>3</sub> in dry oxygen in the temperature range 865–1073 K obeys a logarithmic rate law in the first period of reaction. An activation energy of 214 kJ mol<sup>−1</sup> has been estimated. Some time after this first period, depending on the temperature, the protective oxide film transforms to a porous one and the reaction rate increases. The oxide layer consists of α-Al<sub>2</sub>O<sub>3</sub>, tetragonal ZrO<sub>2</sub> and small amounts of monoclinic ZrO<sub>2</sub>, in contrast to the ZrO<sub>2</sub> oxide layer formed during oxidation of other phases in the Zr-Al system, where the selective oxidation of zirconium takes place.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90014-U","citationCount":"11","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The Less Common Metals","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/002250889190014U","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 11
Abstract
The oxidation of ZrAl3 in dry oxygen in the temperature range 865–1073 K obeys a logarithmic rate law in the first period of reaction. An activation energy of 214 kJ mol−1 has been estimated. Some time after this first period, depending on the temperature, the protective oxide film transforms to a porous one and the reaction rate increases. The oxide layer consists of α-Al2O3, tetragonal ZrO2 and small amounts of monoclinic ZrO2, in contrast to the ZrO2 oxide layer formed during oxidation of other phases in the Zr-Al system, where the selective oxidation of zirconium takes place.
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