{"title":"Influence of Mechanochemical Activation on the Combustion Parameters and Phase Composition of ZnO–Co3O4–Mg(NO3)2·6H2O–Al2O3–Al Pigments","authors":"O. V. L’vov, N. I. Radishevskaya, A. Yu. Nazarova","doi":"10.3103/S1061386223010053","DOIUrl":null,"url":null,"abstract":"<p>Co-containing blue spinel pigments of the system ZnO–Co<sub>3</sub>O<sub>4</sub>–Mg(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O–Al<sub>2</sub>O<sub>3</sub>–Al were prepared by combined use of SHS and mechanochemical activation (MA). IR spectroscopic studies revealed the following processes that accompany the MA: release of water from magnesium nitrate hexahydrate, as evidenced by absorption bands related to free water; phase transformation γ-Al<sub>2</sub>O<sub>3</sub> → α-Al<sub>2</sub>O<sub>3</sub>; and nucleation of spinels. MA was shown to affect the combustion parameters. The combustion products derived from non-activated and activated charges were characterized by XRD, SEM, and optical metallography. It was found that SHS in combination with MA improves the color of pigments due to an increase in the completeness of the conversion of reactions.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 1","pages":"8 - 14"},"PeriodicalIF":0.5000,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","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/S1061386223010053","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: 0
Abstract
Co-containing blue spinel pigments of the system ZnO–Co3O4–Mg(NO3)2·6H2O–Al2O3–Al were prepared by combined use of SHS and mechanochemical activation (MA). IR spectroscopic studies revealed the following processes that accompany the MA: release of water from magnesium nitrate hexahydrate, as evidenced by absorption bands related to free water; phase transformation γ-Al2O3 → α-Al2O3; and nucleation of spinels. MA was shown to affect the combustion parameters. The combustion products derived from non-activated and activated charges were characterized by XRD, SEM, and optical metallography. It was found that SHS in combination with MA improves the color of pigments due to an increase in the completeness of the conversion of reactions.
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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