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Crystal Orientation

晶体取向

基本信息

批准号：
10211203
负责人：
ASAI Sigeo
金额：
$ 39.36万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10211203/
关键词：
electromagnetic processing of materials material science carbon fiber electromagnetic science high magnetic field pitch crystal orientation composite materials 超電動磁石電折配向強磁場材料科学磁場強化繊維

项目摘要

In the processes of I. Solidification, II. Electro deposition, III. Vapor deposition and IV. Solid reaction, the mechanism of crystal and structure alignments in precipitated, deposited and reacted materials have been studied, and the principle of controlling orientations of crystals has been investigated. Tne following results have been obtained.I. SolidificationIn a directional solidification of Fe-Cu alloy, it is found that the imposition of a high magnetic field makes Cu phase of a spherical shape precipitate in a crystal grain not a grain boundary.II. Electrode positionThe electro deposition in a ZnCl-NiCl bath was conducted under the imposition of a high, magnetic field. It is found that the deposited materials change Ni_15Zn_21―NiZn_5―NiZn with increase or magnetic field intensity.III. Vapor depositionZn and Bi were vapor deposited on glasses under a high magnetic field. When the magnetics field was in perpendicular to a substrate. plane, deposited materials were aligned to take a lower magnetization energy state. That is, Bi aligns in a-and b-plane and Zn does in c-plane.IV. Solid ReactionIt is found that in the thermal treatment of coal-tar pitch a high magnetic field promotes to produce mesophase spherules and increase diameters of the spherules, and this, mechanism bases on the magnetic orientation of a carbon hexagonal ring. By imposition of a high magnetic field on tne carbonization process of PAN fibers, me strength of the carbon fibers obtained from the FAN fibers was increased in two times of the fibers without magnetic imposition.

1 .凝固过程；电沉积；研究了沉淀、沉积和反应材料的气相沉积和固相反应、晶体形成机理和结构排列，并探讨了控制晶体取向的原理。得到了以下结果：1。在Fe-Cu合金定向凝固过程中，发现强磁场的施加使Cu相在晶内而非晶界内析出球形。电极位置在施加高磁场的ZnCl-NiCl镀液中进行电沉积。发现沉积材料的Ni_15Zn_21-NiZn_5-NiZn随磁场强度的增大而变化。在高磁场作用下，在玻璃表面气相沉积zn和Bi。当磁场垂直于衬底时。在平面上，沉积的材料排列成较低的磁化能态。也就是说，Bi在a平面和b平面上对齐，Zn在c平面上对齐。研究发现，在煤沥青热处理过程中，强磁场促进了中间相球体的生成和球体直径的增大，其机理基于碳六方环的磁取向。通过在PAN纤维炭化过程中施加强磁场，得到的PAN纤维的碳纤维强度比不施加磁场的碳纤维提高了2倍。