Thermal and phase analysis of aluminothermic self-propagation process in Al-Fe2O3-Cr2O3-NiO system

مهندسی متالورژی و مواد

Volume 34, Issue 1 - Serial Number 29, March 2023, Pages 15-30   

Document Type: Original Articles

DOI: 10.22067/jmme.2023.78953.1081

Authors

Saeed Soltani¹; mahdi kalantar^{* 1}; mohmmadreza Pahlavanshamesi²

¹Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran.

²Technical university of Meybod

Abstract

The high temperature self-progressive combustion synthesis method, especially for aluminothermic systems, is a new method for making all kinds of intermetallic compounds, ceramics and composites with high melting point and hardness. In this study, first the homogenized powder mixtures in the desired ratio in alumino-thermic systems of Al-Fe2O3-Cr2O3-NiO is subjected in differential thermal analysis process and then, the phase composition (X-ray diffraction) of the thermal analyzed samples has been investigated. The obtained results indicate the formation of intermetallic compounds of iron and chromium aluminide as secondary phases with the presence of excess aluminum over the stoichiometric values in the thermally analyzed samples. In addition, with the presence of silicon in the aluminothermic mixtures, chromium silicide compounds are formed instead of chromium aluminide. For the Al-Fe2O3-Cr2O3-NiO system, the metallic phase of stainless steel with a ratio of Fe0.7Cr0.19Ni0.11 and the ceramic phase of Al2O3.are formed. For the Fe2O3- NiO system, only nickel ferrite is formed.

Keywords

Self-combustion synthesis process; Alumino-thermic system of Al-Fe2O3-Cr2O3-NiO; Thermal analysis; Phase analysis

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