Simultaneously enhanced reaction temperature and velocity of self-propagating high-temperature synthesis via Joule-heat induced multi-channel heat flow

Abstract

Simultaneous enhancement of reaction temperature and velocity of self-propagating high-temperature synthesis is still a challenge. Here, we propose a general method based on the Joule-heat induced multi-channel heat flow to simultaneously increase the reaction temperature and velocity of self-propagating high-temperature synthesis. A designed surface structure induces multi-channel Joule-heat accumulation at the surface of reaction components and subsequently multi-channel heat flow during the self-propagating processes. Multi-channel heat flow leads to the formation of two combustion stages: the self-propagating process and the Joule-heat induced grain growth, leading to an enhancement of the maximum reaction temperature up to 67%. Meanwhile, multi-channel heat flow will reduce the propagation distance of the reaction wave and the heat conduction between heat flow channels will increase the temperature of the reaction components, in turn, resulting in an increase in the reaction velocity that is five times higher. We expect that our findings will pave the way for the future application of self-propagating high-temperature synthesis in industries.