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Production of Ultra Fine Particles by Gas Evaporation Technique

气体蒸发技术生产超细颗粒

基本信息

批准号：
63550161
负责人：
HAYASHI Yujiro
金额：
$ 1.34万
依托单位：
KANAZAWA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550161/
关键词：
GAS EVAPORATION TECHNIQUE ULTRA FINE PARTICLE CONTROL OF PARTICLE SIZE SELF-NUCLEATION PARTICLE GROWTH 捕集

项目摘要

The ultra fine particles (UFP) between 10 to 100nm in diameter have so superior characteristics in electric magnetic and the other properties, that they can become the center of the attention to open up new material technology. To make the best use of this characteristics as an element of material, the high efficiency manufacturing technology of UFP should be developed in conjunction with the operating condition to control the particles at uniform size and density. From the standpoint,this study has been conducted to pursue the basic mechanism of UFP production in the gas evaporation techniques including the process of self-nucleation of saturated metal vapor, particle growth, and particle collection. The following are the summary deduced from the investigation.1. As the results of UFP manufacturing experiments in an Ar-gas flow field by using Zn metal and electric heating boat system, the particle characteristics were experimentally made clear in connection with the operating parameter such as the gas pressure, the metal and gas temperature, and the gas velocity. 2. The particle production, which consisted of the process such as self-nucleation, growing, and collection, was analyzed taking account of the interaction between the temperature and mass fields. As compared with the experimental results, the production and the transport process of UFP were clarified analytically. The production velocity and diameter of UFP were also deduced in relation to the operating parameter. 3. On the basis of the above findings, the fundamental knowledge of UFP manufacturing process was obtained.

直径在10~100 nm之间的超细粒子(UFP)具有优异的电磁等性能，可以成为开发新材料技术的关注焦点。为了充分利用UFP作为材料元素的这一特性，必须结合操作条件开发高效的UFP制造技术，以控制颗粒的均匀尺寸和密度。从这一角度出发，本研究旨在探讨气体蒸发技术中超细颗粒产生的基本机理，包括饱和金属蒸气的自成核过程、颗粒生长和颗粒收集过程。以下是从调查中得出的结论1.作为用锌金属和电加热船系统在Ar气体流场中制造超细颗粒的实验结果，实验研究了气体压力、金属和气体温度、气体速度等操作参数对颗粒特性的影响。2.考虑了温度场和质量场的相互作用，分析了颗粒的形成过程，包括自成核、长大和聚集等过程。通过与实验结果的对比，从理论上阐明了UFP的产生和输送过程。还推导了超细粉尘的生产速度和直径与操作参数的关系。3.在上述研究成果的基础上，掌握了UFP制造工艺的基本知识。