NDLI: Characterization of composites containing NiAl$_{2}$O$_{4}$ spinel phase from Al$_{2}$O$_{3}$/NiO and Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Zygmuntowicz, Justyna Wiecińska, Paulina Miazga, Aleksandra Kopka, Katarzyna
Copyright Year	2016
Abstract	This paper focused on the characterization of the composites containing nickel aluminate spinel from Al$_{2}$O$_{3}$/NiO and Al$_{2}$O$_{3}$/Ni systems. The composites were prepared by die pressing of powders and subsequent sintering of green bodies in air atmosphere. Composites were characterized by XRD, SEM, EDS and DTA/TG/MS analyses. The physical properties of the composites were measured by Archimedes method. Quantitative description of the composites microstructure was made on the basis of SEM images using computer image analysis. The XRD studies and SEM observations of composites confirmed the presence of two phases Al$_{2}$O$_{3}$ and NiAl$_{2}$O$_{4}$ in the whole volume of samples from both systems. Spinel phase was evenly distributed throughout the volume of the material. Morphology of NiAl$_{2}$O$_{4}$ obtained from both systems was characterized by the presence of voids. The DTA/TG/MS measurements showed the characteristics of organic binder decomposition and type of gases released to the atmosphere during thermal treatment. Moreover, the DTA/TG analysis showed the temperature of spinel-phase formation for both systems. It was found that the spinel-phase NiAl$_{2}$O$_{4}$ formation retards the process of densification. Therefore, it can be concluded that densification of samples with spinel phase depends mainly on the volume of spinel phase in composite material and does not depend on the substrates used to prepare spinel phase. The values of the selected properties of Al$_{2}$O$_{3}$–Ni- and Al$_{2}$O$_{3}$–NiO-based materials confirmed that the physical properties depend on the type of substrates used in the fabrication of composites. The type of powder influences the open porosity of samples. For composites produced using NiO powder, open porosity is lower than for samples formed with nickel powder.
Starting Page	1079
Ending Page	1086
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	125
Issue Number	3
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-03-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al$_{2}$O$_{3}$–NiO Al$_{2}$O$_{3}$–Ni Spinel-phase NiAl$_{2}$O$_{4}$ DTA/TG/MS analyses Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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