NDLI: Thermodynamic analysis of thermite reactions for synthesizing Ni-based alloys

Content Provider	Springer Nature Link
Author	Xi, Wenjun Zhou, Heping Ma, Chaoli Duan, Huiping Zhang, Tao
Copyright Year	2007
Abstract	The equilibrium compositions of a thermite reaction system (Fe$_{2}$O$_{3}$+Cr$_{2}$O$_{3}$+CrO$_{3}$+NiO+O$_{2}$+N$_{2}$+TiO$_{2}$+C+S+CaO+Al), which was used to prepare Ni-based alloys, were predicted by means of the free energy minimization method. The effects of the reactant contents on the equilibrium compositions and the adiabatic temperature of the thermite reaction system were analyzed. The microstructure of the Ni-based alloys was investigated. The thermodynamic analysis indicated that the products of the thermite reaction system contained primarily Al$_{2}$O$_{3}$, Fe, Ni, Cr, Ni$_{3}$Al and NiAl, due to impurities C, N$_{2}$ and S in the raw materials, there could also exist TiC, Cr$_{7}$C$_{3}$, CrN, CaS and TiN in the equilibrium products. The amount of Ni$_{3}$Al and NiAl in the products increased with increase of the aluminum content in the starting materials. The microstructure investigation showed that the Ni-based alloys consisted of austenite, ferrite, Ni$_{3}$Al and NiAl. The existence of Ni$_{3}$Al and NiAl in the Ni-based alloys reconciled with the predictions of thermodynamic analysis, suggesting the free energy minimization method is useful in designing advanced materials with multiple components by thermite reaction technique.
Starting Page	8489
Ending Page	8495
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	20
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2007-06-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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