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Development of the Function Aligning Crystal Orientation to Materials Used in Practice

开发将晶体取向与实际使用的材料对齐的功能

基本信息

批准号：
13852013
负责人：
ASAI Shigeo
金额：
$ 78.29万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2005
项目状态：
已结题

项目摘要

I.Research on carbon materials :The following knowledge has been found. (1)The heat treatment of carbon fibers under a high magnetic field of 5T and weak tension strengthens double the mechanical strength of carbon fibers. (2)Mesophase microspheres with homogenous size can be formed by heating a tar pitch under a high magnetic field. (3)The reaction in which mesophase particles are formed by decomposing mesitylene under high pressure, is considerably disturbed by imposition of a magnetic field of 10T.II.Research on biomaterials :The uni-directional crystal alignment of biomaterials such as hydroxyapatite (HAp) is useful for bone reparation. (1)A novel process where a sample is rotated during a slip casting under a high magnetic field has newly been proposed to fabricate uni-directionally oriented compacts. This new process indicated that crystal orientation as high as about 100% was obtained. (3)Moreover, the fabrication of HAp/collagen composite also was carried out. Highly oriented c … More ollagen fibers and weakly crystallized HAp crystals were fablicated.III.Research on nonmagnetic metals :It has been found that the imposition of a high magnetic field during solidification can align Zinc crystal orientation.IV.Research on ceramics :Uni-directionally oriented compacts of structural Si_3N_4 ceramics and thermoelectric Bi_2Te_3 ceramics were fabricated by rotating a sample during slip casting under a high magnetic field. This method was developed to prepare the compact with multilayer of uni-directionally oriented compact of Si_3N_4, which had higher mechanical strength than that without crystal orientation. The figure of merit for fabricated Bi_2Te_3 1.3 at 323K, is the highest value among the values reported hitherto.V.Research on development of an in situ, method to quantify a phase transformation rate :A new method to quantify a phase transformation rate has developed and applied to γ/α phase transformation. This method is in situ and enables to clearly determine the start and end points of the transformation. Less

关于碳材料的研究：发现了以下知识。(1)在5T强磁场和弱拉伸条件下对碳纤维进行热处理，可使碳纤维的机械强度提高一倍。(2)在强磁场作用下加热焦油沥青可制得尺寸均匀的中间相微球。(3)高压下均三甲苯分解形成中间相粒子的反应，受到10T磁场的干扰。II.生物材料研究：羟基磷灰石(HAP)等生物材料的单向晶体排列有助于骨修复。(1)最近提出了一种在强磁场下旋转样品制备单向压坯的新工艺。这一新工艺表明，获得了高达100%的晶体取向。(3)还进行了羟基磷灰石/胶原复合材料的制备。高度定向的c++…非磁性金属的研究：发现在凝固过程中施加强磁场可以使锌的晶体取向取向。IV.陶瓷的研究：在强磁场作用下，通过旋转样品制备了结构陶瓷Si3N4和热电陶瓷Bi2Te3的单向取向压坯。用这种方法制备了具有多层单向取向的Si3N4压坯，其机械强度高于无晶体取向的压坯。在323K下制备的Bi2Te_31.3的优值系数是迄今报道的最高值。V.相变率原位量化方法的研究：一种新的相变率量化方法已经发展并应用于γ/α相变。这种方法是原位的，能够清楚地确定转换的起点和终点。较少