DOI: 10.5176/2251-1857_M318.22
Authors: Qumars Aghelan, Mandana Adeli, Seyed Hossein Seyedein, M. Reza Aboutalebi
Abstract: The application of the combustion synthesis process to produce CoAl intermetallic compound from a mixture of cobalt and aluminum powders was investigated. Due to the high exothermicity of the Co+Al→CoAl reaction and high adiabatic temperature of the system (1901K), applying a high heating rate to the compressed powders can make the combustion reaction occur in the sample, leaving behind the reaction products. Examination of the product by XRD and SEM showed CoAl as the dominant phase of the sample. In order to investigate the effect of low energy ball-milling, the starting powders were separately ball-milled for 20min at 400rpm. The measurement of product grain size showed that the final grain size of CoAl significantly decreased as a result of pre-milling of the starting powders.
Keywords: cobalt aluminide; combustion synthesis; intermetallics; ball-milling
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