The interfacial reaction between graphite and a ZrNbHfTa foil using a spark plasma sintering (SPS) machine was studied. The interlayer was converted during the treatment into a high-entropy carbide by the reaction between the alloy and the graphite substrate. The degree of conversion depended on the processing time and temperature, but could be completed in only 16 s using the flash spark plasma sintering process. The final microstructure was strongly influenced by the heating rate. Flash-SPS processing (heating rate about 120°C/s) melted the alloy, which is then squeezed and deformed before its conversion to the high-entropy carbide (Zr,Nb,Hf,Ta)C. On the contrary, when conventional heating was used (i.e., 10°C/min) the metal reacted with the graphite substrate before it melted. This concept appears to be generally applicable to different graphite/metal systems, with particular implications in the fields of graphite/metal joining.

Interfacial reaction between ZrNbHfTa foil and graphite: Formation of high-entropy carbide and the effect of heating rate on its microstructure / Biesuz, M.; Saunders, T. G.; Chen, K.; Bortolotti, M.; Salvo, M.; Grasso, S.; Reece, M. J.. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - 40:7(2020), pp. 2699-2708. [10.1016/j.jeurceramsoc.2019.12.011]

Interfacial reaction between ZrNbHfTa foil and graphite: Formation of high-entropy carbide and the effect of heating rate on its microstructure

Salvo M.;
2020

Abstract

The interfacial reaction between graphite and a ZrNbHfTa foil using a spark plasma sintering (SPS) machine was studied. The interlayer was converted during the treatment into a high-entropy carbide by the reaction between the alloy and the graphite substrate. The degree of conversion depended on the processing time and temperature, but could be completed in only 16 s using the flash spark plasma sintering process. The final microstructure was strongly influenced by the heating rate. Flash-SPS processing (heating rate about 120°C/s) melted the alloy, which is then squeezed and deformed before its conversion to the high-entropy carbide (Zr,Nb,Hf,Ta)C. On the contrary, when conventional heating was used (i.e., 10°C/min) the metal reacted with the graphite substrate before it melted. This concept appears to be generally applicable to different graphite/metal systems, with particular implications in the fields of graphite/metal joining.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2791794