Influence of Mechanochemical Activation on the Combustion Parameters and Phase Composition of ZnO–Co3O4–Mg(NO3)2·6H2O–Al2O3–Al Pigments

Co-containing blue spinel pigments of the system ZnO–Co 3 O 4 –Mg(NO 3 ) 2 ·6H 2 O–Al 2 O 3 –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 hexahydra...

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Bibliographic Details
Published in:International journal of self-propagating high-temperature synthesis 2023-03, Vol.32 (1), p.8-14
Main Authors: L’vov, O. V., Radishevskaya, N. I., Nazarova, A. Yu
Format: Article
Language:English
Subjects:
Absorption spectra
Aluminum oxide
Chemistry and Materials Science
Cobalt oxides
Combustion products
Magnesium
Materials Science
Metallography
Nucleation
Parameters
Phase composition
Phase transitions
Pigments
Spinel
Transitional aluminas
Zinc oxide
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Summary:Co-containing blue spinel pigments of the system ZnO–Co 3 O 4 –Mg(NO 3 ) 2 ·6H 2 O–Al 2 O 3 –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 2 O 3 → α-Al 2 O 3 ; 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.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386223010053