基于自反应淬熄法制备空心复相陶瓷微珠吸波剂的凝固组织分析  

Solidification Structure of Hollow Multiphase Ceramic Microspheres Absorbent Prepared by Self-reactive Quenching Method

作　　者：娄鸿飞[1] 王建江[1] 赵志宁 蔡旭东[1] 侯永伸[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003 [2]总参炮兵训练基地,宣化075100

出　　处：《人工晶体学报》2013年第7期1419-1424,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51172282);武器装备预研基金项目(9140A12040211JB34)

摘　　要：本文以Al-TiO2-Fe-MnO2-Fe2O3-蔗糖和O2为反应体系与送粉气,利用自反应淬熄法合成了空心复相陶瓷微珠。借助SEM、EDS与XRD等现代分析测试方法,对微珠的凝固过程进行了表征与分析。结果表明,高热的空心陶瓷熔滴进入冷却介质(蒸馏水)后,发生快速淬熄转变,发生表面枝晶长大及纳米条状晶形成,内部柱状晶形成,内部纳米等轴晶粒形成等现象形成空心复相陶瓷微珠,同时共晶组织的形成伴随凝固全过程。微珠由Al2O3与呈尖晶石结构的Fe3O4、Mn3O4、(Fe2.5Ti0.5)O4、Mn2AlO4组成,其中呈尖晶石结构的后四种成分形成固溶体,并与Al2O3形成共晶组织。超大过冷度条件可能是产生以上组织的主要原因。In this paper,hollow multiphase ceramic microspheres was generated by self-reactive quenching technology,and tusing Al-TiO2-Fe-Fe2O3-MnO2-Sucrose and O2 as reaction system and feeding gas respectively.Solidification has been analyzed by SEM,EDS and XRD.The results show that after hollow ceramic droplets entering into cooling medium（distilled water）,the rapid quenching change was generated.And surface dendrite growth,nano-strip crystal formation,internal columnar crystal formation and internal nano-isometric grains formation occur.Then hollow multiphase ceramic microspheres are generated.The formation of eutectic structure will accompany the whole process of solidification.The components of microspheres is comprised by Al2O3 and Fe3O4,Mn3O4,（Fe2.5Ti0.5） O4,Mn2AlO4 which show spinel structure.The eutectic structure is formed between first four substances and Al2O3.Super large degree of undercooling conditions may be the main reason to produce the above organizations.

关 键 词：空心复相陶瓷微珠 凝固 自反应淬熄 

分 类 号：TB333[一般工业技术—材料科学与工程]