摘要
玻璃与陶瓷微球作为一种新型微米级特种材料,近年来得到了广泛的研究和应用。本研究使用喷雾造粒设备制备了系列不同组成与粒径的Al_(2)O_(3)-CaCO_(3)初始粉料,并通过等离子熔融方法成功制备了系列Al_(2)O_(3)-CaO二元玻璃/陶瓷透明微球。研究结果表明,Al_(2)O_(3)-CaO体系球化后,Al_(2)O_(3)含量大于50%(摩尔分数,下同)时微球主要为陶瓷态,其主晶相为Ca_(3)Al_(10)O_(18)、CaAl_(2)O_(4)和CaAl_(4)O_(7);当Al_(2)O_(3)含量为50%时,可形成玻璃和陶瓷态混合的微球,主晶相为CaAl_(2)O_(4);当Al_(2)O_(3)含量为34%时,微球主要为玻璃态,并伴有少量Ca_(3)Al_(2)O_(6)和CaAl_(2)O_(4)晶相。随着微球粒径的减小,其玻璃相的含量增加。微球的硬度和弹性模量与组成及微观结构密切相关,最大硬度为10.45 GPa,弹性模量为114.1 GPa,且在形成玻璃微球后降低。^(27)Al核磁共振分析结果表明,随着Al_(2)O_(3)含量增加,微球中Al的配位状态从4配位转变为5配位和6配位,粒径大小对其影响很小。
As a new type of micron-scale specialty material,glass and ceramic microspheres have been widely studied and applied in recent years.In this research,a series of Al_(2)O_(3)-CaO_(3) initial powders with different compositions and particle sizes were prepared by spray granulation equipment,and a series of Al_(2)O_(3)-CaO binary glass/ceramic transparent microspheres were successfully prepared by plasma melting method.The results show that after Al_(2)O_(3)-CaO system spheroidization,when the Al_(2)O_(3) content is more than 50%(mole fraction,the same below),the microspheres are mainly in ceramic state,and the main crystal phases are Ca_(3)Al_(10)O_(18),CaAl_(2)O_(4) and CaAl4O7.When the content of Al2O3 is 50%,the mixture of glass and ceramic microspheres can be formed,and the main crystal phase is CaAl_(2)O_(4).When the Al2O3 content is 34%,the microspheres are mainly glass state,accompanied by a small amount of Ca_(3)Al_(2)O_(6) and CaAl_(2)O_(4) crystal phases.As the particle size of the microspheres decreases,the content of the glass phase also increases.The hardness and elastic modulus of the microspheres are closely related to the composition and microstructure.The maximum hardness is 10.45 GPa,and the elastic modulus is 114.1 GPa,which decreases after the formation of glass microspheres.27Al NMR analysis results show that with the increase of alumina content,the coordination state of aluminum in the microspheres changes from four-coordinated to five-coordinated and six-coordinated,and the particle size has little effect on it.
作者
周扬成
王翔
温斌
张继红
谢俊
韩建军
ZHOU Yangcheng;WANG Xiang;WEN Bin;ZHANG Jihong;XIE Jun;HAN Jianjun(Sanya Science and Education Innovation Park of Wuhan University of Technology,Sanya 572000,China;State Key Laboratory of Advanced Glass Materials,Wuhan University of Technology,Wuhan 430070,China;Hepu Research Center for Silicate Materials Industry Technology,Beihai 536100,China)
出处
《硅酸盐通报》
北大核心
2025年第8期3031-3041,共11页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金面上项目(52372033)
武汉理工大学三亚科教创新园开放基金(2022KF0026)。
关键词
铝酸盐
射频等离子体
微球
粒径
玻璃化
aluminate
radio frequency plasma
microsphere
particle size
vitrification
