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Rapid synthesis of magnetic ceramics powders from powder mixtures by using well-controlled thermal plasmas

使用良好控制的热等离子体从粉末混合物快速合成磁性陶瓷粉末

基本信息

批准号：
11792027
负责人：
FUKUMASA Osamu
金额：
$ 4.67万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for University and Society Collaboration
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11792027/
关键词：
thermal plasma processing plasma jet synthesis of fine particles ferrite powders CCD camera β"-alumina spraying of MgO

项目摘要

1. Development of the well controlled thermal plasma reactorThe system consists of the forced constricted type plasma jet generator, the feed ring and the vacuum vessel. With the use of the floating constriction nozzle, our newly designed reactor produces stable plasma jet for various operating conditions.2. Rapid synthesis of ferrite powdersFerrite films and ferrite powders are successfully synthesized from powder mixtures of Fe_2O_3, ZnO, NiO and CuO. Ferrite with high purity can be synthesized irrespective of processing duration time and collecting position.3. Development of the diagnostic system with CCD cameraDiagnostic system of processing plasma jet over the whole reaction region using the CCD camera with optical filters is developed. It is confirmed that with the present system and also two line method, two dimensional distribution of the jet temperature is obtained.4. Other two thermal plasma processings(1)Thermoelectric materials (β"- alumina) are well synthesized from powder mixtures of Al_2Q_3, Na_2CO_3 and MgO. Oxygen injection also enhances the synthesis of β"-alumina. Mo spraying produces porous films under atmospheric pressure and dense films under reduced pressure.(2)Under some experimental conditions, MgO films are well prepared although spraying of MgO is usually said to be difficult due to its particular properties.5. Modeling of RF thermal plasmaA numerical model is developed to clarify three-dimensional effects of carrier gas and particle injections on the thermo-fluid fields of plasma jets.

1.可控热等离子体反应器的研制该系统由强制收缩式等离子体射流发生器、进料环和真空容器组成。通过使用浮动收缩喷嘴，我们新设计的反应器产生稳定的等离子体射流，适用于各种操作条件。铁氧体粉末的快速合成以Fe_2O_3、ZnO、NiO和CuO的混合粉末为原料，成功地合成了铁氧体薄膜和铁氧体粉末。不受工艺持续时间和收集位置的影响，可以合成高纯度的铁氧体. CCD摄像机诊断系统的研制研制利用带滤光片的CCD摄像机，研制了等离子体射流加工全反应区诊断系统。结果表明，利用本系统和双线法，可以得到射流温度的二维分布.（1）以Al_2O_3、Na_2CO_3和MgO的混合粉末为原料合成了热电材料（β"-Al_2O_3）。氧气注入也促进了β"-氧化铝的合成。Mo喷涂在常压下可获得多孔膜，在减压下可获得致密膜。（2）在一定的实验条件下，可以很好地制备出MgO薄膜，尽管由于MgO的特殊性质，通常认为MgO的喷涂是困难的.射频热等离子体的数值模拟建立了一个数值模型，以阐明载气和粒子注入对等离子体射流热流场的三维影响。