NDLI: Morphology of α-Si$_{3}$N$_{4}$ in Fe–Si$_{3}$N$

Content Provider	Springer Nature Link
Author	Li, Bin Chen, Jun hong Su, Jin dong Yan, Ming wei Sun, Jia lin Li, Yong
Copyright Year	2015
Abstract	The state and formation mechanism of α-Si$_{3}$N$_{4}$ in Fe–Si$_{3}$N$_{4}$ prepared by flash combustion were investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that α-Si$_{3}$N$_{4}$ crystals exist only in the Fe–Si$_{3}$N$_{4}$ dense areas. When FeSi75 particles react with N$_{2}$, which generates substantial heat, a large number of Si solid particles evaporate. The product between Si gas and N$_{2}$ is a mixture of α-Si$_{3}$N$_{4}$ and β-Si$_{3}$N$_{4}$. At the later stage of the flash combustion process, α-Si$_{3}$N$_{4}$ crystals dissolve and reprecipitate as β-Si$_{3}$N$_{4}$ and the β-Si$_{3}$N$_{4}$ crystals grow outward from the dense areas in the product pool. As the temperature decreases, the α-Si$_{3}$N$_{4}$ crystals cool before transforming into β-Si$_{3}$N$_{4}$ crystals in the dense areas of Fe–Si$_{3}$N$_{4}$. The phase composition of flash-combustion-synthesized Fe–Si$_{3}$N$_{4}$ is controllable through manipulation of the gas-phase reaction in the early stage and the α→β transformation in the later stage.
Starting Page	1322
Ending Page	1327
Page Count	6
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	22
Issue Number	12
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2015-12-03
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	silicon nitride combustion synthesis morphology crystal growth Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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