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。良好控制的热等离子体反应器的开发系统由强制收缩类型的等离子喷射器，进料环和真空容器组成。通过使用浮动收缩喷嘴，我们新设计的反应堆可为各种操作条件生产稳定的等离子喷气机。2。铁氧体粉末薄膜和铁氧体粉末的快速合成是从Fe_2O_3，Zno，Nio和CuO的粉末混合物中成功合成的。具有高纯度的铁氧体可以合成，无论处理持续时间和收集位置如何。3。使用CCD摄影系统在整个反应区域使用CCD摄像头与光学过滤器开发诊断系统。可以证实，通过当前系统和两条线方法，获得了射流温度的二维分布4。其他两种热等离子体过程（1）热电材料（β“ - 氧化铝）是从Al_2Q_3，Na_2Co_3和MgO的粉末混合物中很好地合成的。氧气注射也增强了β的合成。 MO喷雾在大气压力和降压下的密集膜下产生多孔膜。（2）在某些实验条件下，MGO膜做好了充分的准备，尽管通常认为MGO的喷雾由于其特定特性很困难。5。 RF热等离子体数值模型的建模是为了阐明载体气体和颗粒注射对等离子体喷射热流体场的三维影响。