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以Al-SiO2-蔗糖为反应体系,利用自反应淬熄法合成了Al2O3-Si复相空心陶瓷微珠,研究了其形成机制。结果表明,熔射产物由球形、类球形和不规则粉状物三类颗粒组成,球形颗粒和类球形颗粒为内部空心结构,由Al2O3-Si复相以及可能含有的少量未反应SiO2组成,粉状物由SiC、C与可能含有的SiO2和发生反应但未成球的颗粒组成。高的反应放热量与快的反应速率有利于陶瓷熔滴的形成,C氧化产生的大量气体是形成内部空心结构的关键,3个因素共同决定着空心陶瓷微珠的形成。
Al2O3-Si composite hollow ceramic microspheres were synthesized by self-reaction quenching method with Al-SiO2-sucrose as reaction system, and the formation mechanism was studied. The results show that the products consist of three kinds of spherical, spherical and irregular powders. The spherical particles and the spherical particles are internal hollow structures and consist of Al2O3-Si complex phase and possibly a small amount of unreacted SiO2. The material consists of SiC, C, and possible SiO 2 and unreacted particles. High reaction exotherm and fast reaction rate are beneficial to the formation of ceramic droplets. The large amount of gas generated by C oxidation is the key to the formation of hollow structure. The three factors determine the formation of hollow ceramic beads.