空间晶体生长流体效应的实验研究和理论分析  

EXPERIMENTAL AND THEORETICAL STUDY OF CONVECTIVE EFFECTS IN SPACE CRYSTAL GROWTH

作　　者：刘照华[1] 金蔚青[1] 潘志雷[1] 陈刚毅[1] 蒋元方[2] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]华东师范大学物理系,上海200062

出　　处：《硅酸盐学报》2002年第6期725-730,共6页Journal of The Chinese Ceramic Society

基　　金："九五"攀登计划资助项目(攀95-预-34);国家自然科学基金资助项目(59832080)。

摘　　要：在空间晶体生长实时观察装置上,利用熔液中形成的铌酸钾微晶作示踪粒子,首次在空间高温氧化物熔液内,实时观察和记录了空间表面张力对流效应。利用测量的结果计算了熔体内空间表面张力对流的速度场,并与地面表面张力对流的速度场进行了对比,理论计算与实验结果基本吻合。探讨了空间均匀分布铌酸钾微晶的形成机理。结果表明:表面张力对流在空间晶体生长过程中起主要作用,是形成均匀分布胞状晶体的主要机理。The space surface tension convection was observed in high temperature oxide solution by using space high temperature situ observation facility and the traced particles of microcrystal KNbO3 . The velocity field of the space surface tension convection was theoretically calculated with the detected experimental data in the solution and compared with that of the ground surface tension convection. The theoretical data were found in good agreement with the experimental results. The mechanism of formation of uniformly distributed microcrystal KNbO3 was analyzed and the result show that the surface tension convection plays a main role in the space crystal growth and the formation of uniformly distributed cellulation.

关 键 词：空间晶体生长 流体效应 实验研究 高温流体效应 表面张力对流 示踪粒子 速度场 

分 类 号：O781[理学—晶体学]