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材料工程  2003, Vol. 0 Issue (6): 29-31,35    
  研究与应用 本期目录 | 过刊浏览 | 高级检索 |
微波非热效应诱发的陶瓷材料中物质各向异性扩散
翟华嶂1, 李建保1, 黄向东2, 戴金辉1
1. 清华大学新型陶瓷与精细工艺国家重点实验室, 北京, 100084;
2. 三明市科技局, 三明, 365000
Anisotropy of Ceramic Diffusion Enhanced by Microwave Non-thermal Effect
ZHAI Huazhang1, LI Jianbao1, HUANG Xiangdong2, DAI Jinhui1
1. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China;
2. Science & Technology Bureau of Sanming City, Sanming 365000, China
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摘要 利用微波烧结Cr2O3-Al2O3/Al2O3双层复合材料,通过对材料断面的X射线能谱线扫描发现,铬离子从富铬的氧化铝层通过界面向纯氧化铝层扩散时,扩散距离是各向异性的,沿入射微波振动方向的扩散距离比沿入射波传播方向深大约28%。这种扩散的各向异性是由于入射波的方向性电场在微波加热过程中叠加在示踪离子的化学势上导致的。从微波场对带电粒子跃迁影响的角度阐述微波非热效应加速陶瓷材料中固有的扩散过程,推导出微波场中物质扩散通量JM和物质的本征扩散通量JC之间的关系式。
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翟华嶂
李建保
黄向东
戴金辉
关键词 非热效应微波加热各向异性扩散    
Abstract:Three pieces of Cr2O3-Al2O3/Al2O3 double-layered pellets were set in microwave chamber in three ways perpendicularly to each other. After specimens were sintered in microwave at 1580℃ for 30 minutes, the tracer Cr3+ ion cross-section of specimens were analyzed by XEDS. The diffusion distances of Cr3+ ion into other side in the direction of microwave oscillations were greater approximately 28% than that in the microwave propagating direction. The anisotropic diffusion was caused by polarized electric field of microwave superimposed on the chemical potential of tracer ion during microwave heating. The intrinsical diffusion in ceramics sped by microwave non-thermal effect was explained through that the microwave field influence on the charged particles. The relationship of diffusion flux in the microwave field JM and heat-driven lattice oscillation diffusion flux JC was also educed.
Key wordsanisotropic diffusion    microwave heating    non-thermal effect
收稿日期: 2002-06-25      出版日期: 2003-06-20
中图分类号:  TM924  
基金资助:国家自然科学基金5943206;清华大学985资助ZA02
作者简介: 翟华嶂(1973- ), 男, 博士研究生, 材料学专业, 联系地址: 清华大学材料科学与工程系(100084).
引用本文:   
翟华嶂, 李建保, 黄向东, 戴金辉. 微波非热效应诱发的陶瓷材料中物质各向异性扩散[J]. 材料工程, 2003, 0(6): 29-31,35.
ZHAI Huazhang, LI Jianbao, HUANG Xiangdong, DAI Jinhui. Anisotropy of Ceramic Diffusion Enhanced by Microwave Non-thermal Effect. Journal of Materials Engineering, 2003, 0(6): 29-31,35.
链接本文:  
http://jme.biam.ac.cn/new/CN/      或      http://jme.biam.ac.cn/new/CN/Y2003/V0/I6/29
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