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Implementation of Thermite Reactions in the Production of Advanced Intermetallic-Matrix Composites: The Case of Nb2O5/Al Thermite Mixture

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Abstract

In this study, the application of thermite reactions in Nb2O5–Al system in the fabrication of novel NbAl3/Al2O3 composites was investigated. Combining the thermite reactions with self-propagating high-temperature synthesis (SHS) technique in compressed powder mixtures of Nb2O5 + Al resulted in layer-by-layer progress of the exothermic reaction, controlled formation of the desired products and their coexistence in each reacted layer. Characterization of the products using X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) techniques showed that all samples were composed of a metallic matrix including NbAl3 as the main compound, along with Al2O3 as ceramic reinforcing phase. Differential thermal analysis (DTA) analysis was used to study the mechanism of reaction using both stoichiometric and over-stoichiometric amounts of aluminum. The effect of such parameters as stoichiometry and green density of the samples on the combustion temperature, formed phases, microstructure, and hardness of the obtained composites was investigated using samples with stoichiometric as well 20 wt% and 40 wt% excess aluminum, and samples with green densities of 75%, 85%, and 95% of theoretical maximum density (TMD). The presence of excess aluminum resulted in prolonged reaction times, lower combustion temperatures, and lower mean values of hardness. While the variations in green density had no remarkable effect on the microstructural features of products within the density range under study, the most intensive reactions, highest combustion temperature, and highest mean value of hardness were encountered in samples with green density of 85%TMD.

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Ahmadi-Binahri, A., Adeli, M., Aboutalebi, M.R. et al. Implementation of Thermite Reactions in the Production of Advanced Intermetallic-Matrix Composites: The Case of Nb2O5/Al Thermite Mixture. Met. Mater. Int. 28, 1499–1507 (2022). https://doi.org/10.1007/s12540-021-01047-x

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