Effect Of Heat On Hollow Multiphase Ceramic Microspheres Prepared By Self-Reactive Quenching Technology

The self-reactive quenching technology, which combines flame thermal spraying technology, self-propagaging high-temperature synthesis, and rapid solidification, is a new method for preparation of hollow microspheres. Based on this, the effect of heat released by different exothermic systems on preparation of hollow ceramic microsphere was studied. Results show that for low-exothermic system Si-Sucrose-NH4Cl, the self-propagating reactions cannot occur, and the quenching products are Si microspheres with a porous structure. For the moderate exothermic system Al-SiO2-Sucrose,t he quenching products consist of some grains, which are hollow spherical or nearly spherical particles and irregular powders.