{"title":"The Influence of Ammonium Nitrate/Urea Ratio on the Reaction Process and Structure of Formed Alumina–Mullite Composite","authors":"E. Feizabadi, A. Meysami, M. Hajisafari","doi":"10.3103/S1061386222030037","DOIUrl":null,"url":null,"abstract":"<p>In this study, the initial materials including aluminum nitrate nonahydrate and silicon powder were used to produce alumina–mullite composite through solution combustion synthesis (SCS). This paper aimed to investigate the influence of ammonium nitrate added as co-fuel to urea on the formation of alumina–mullite. For this purpose, ammonium nitrate/urea ratios of 0, 0.2, 0.4 and 0.5 were used for SCS. It was revealed through thermo-chemical calculations that increasing this ratio enhances the adiabatic temperature of combustion and facilitates the formation of crystalline mullite that is confirmed by structural analysis. XRD patterns showed that with increasing ammonium nitrate/urea ratio, the mullite peaks are intensified, and its trend is into the crystalline structure. Hence the mullite volume fraction increased from 4.12 to 30.52%. SEM studies showed that this ratio decreases a mean particles size from 264 to 133 nm.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Self-Propagating High-Temperature Synthesis","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.3103/S1061386222030037","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 1
Abstract
In this study, the initial materials including aluminum nitrate nonahydrate and silicon powder were used to produce alumina–mullite composite through solution combustion synthesis (SCS). This paper aimed to investigate the influence of ammonium nitrate added as co-fuel to urea on the formation of alumina–mullite. For this purpose, ammonium nitrate/urea ratios of 0, 0.2, 0.4 and 0.5 were used for SCS. It was revealed through thermo-chemical calculations that increasing this ratio enhances the adiabatic temperature of combustion and facilitates the formation of crystalline mullite that is confirmed by structural analysis. XRD patterns showed that with increasing ammonium nitrate/urea ratio, the mullite peaks are intensified, and its trend is into the crystalline structure. Hence the mullite volume fraction increased from 4.12 to 30.52%. SEM studies showed that this ratio decreases a mean particles size from 264 to 133 nm.
期刊介绍：
International Journal of Self-Propagating High-Temperature Synthesis is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.
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