Flame propagation characteristics and combustion mechanism of FeOOH-coated zirconium particles

摘要: Zirconium (Zr) particles are coated with ferric oxyhydroxide (FeOOH) nanoparticles to form a core–shell structure, and this process alters the combustion performance of zirconium particles. This study explored flame propagation characteristics mechanism FeOOH-coated A high-speed observation system was used reveal velocities temperatures, scanning electron microscopy, thermogravimetry (TG), X-ray diffraction were examine elucidate The results showed that when concentration increased, pure dust cloud higher than those molar ratio 1:6, which in turn 1:3 due content. With increasing from 0.313 0.938 kg m−3, temperatures 1:6 both no peak. Moreover, always 1:3. There three phases mass loss by TG test. first phase because evaporation particles, second generation Fe2O3 dehydroxylation FeOOH. third residual thermal decomposition Fe3O4 being formed Fe2O3. It also concluded replacement reaction occurred between Zr process, Fe is oxidized at high temperatures.