摘要
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。
With Al-SiO2-sucrose as reactive system,Al2O3-Si hollow ceramic microspheres were synthesized using SHS flame quenched technology.Reaction mechanism of hollow ceramic microspheres was studied.The results show that sphere,similar sphere and irregular powders constitute the spraying products.The sphere and similar sphere powders are hollow structure and constitutive of Al2O3-Si diphase and maybe a few unreactive SiO2.The irregular powders are constitutive of SiC、 C and maybe some SiO2 and reactive but not spherical particles.High reactive heat quantity and fast reaction rate make for the formation of ceramic droplets and the gas produced by carbon is the key factor to form hollow structure.All above three factors determine the formation of hollow ceramic microspheres.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2011年第2期174-178,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助项目(50672130)
关键词
团聚粉
Al2O3-Si
空心陶瓷微珠
自反应淬熄法
陶瓷熔滴
agglomerate powders
Al2O3-Si
hollow ceramic microspheres
self-reaction flame quenched technology
ceramic droplets
