2001 Fiscal Year Final Research Report Summary
Rapid synthesis of magnetic ceramics powders from powder mixtures by using well-controlled thermal plasmas
| Project/Area Number |
11792027
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
プラズマ理工学
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| Research Institution | Yamaguchi University |
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Principal Investigator |
FUKUMASA Osamu Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (20026321)
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| Co-Investigator(Kenkyū-buntansha) |
SAKIYAMA Satoshi Yamaguchi University, Faculty of Engineering, Research Assistant, 工学部, 助手 (60162327)
HANO Mitsuo Yamaguchi University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70108265)
OSAKI Katashi Yamaguchi University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30035050)
TAKAHASHI Toru Japan Ultra-high Temperature Materials Research Center, Senior Researcher, 山口研究所, 主任研究員
FUJIOKA Kazuo Toda Kogyo Company, Research Manager, 経営戦略サポート本部, 経営戦略マネージャー(研究職)
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| Project Period (FY) |
1999 – 2001
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| Keywords | thermal plasma processing / plasma jet / synthesis of fine particles / ferrite powders / CCD camera / β"-alumina / spraying of MgO |
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| Research Abstract |
1. Development of the well controlled thermal plasma reactor
The 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 powders
Ferrite 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 camera
Diagnostic 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 plasma
A numerical model is developed to clarify three-dimensional effects of carrier gas and particle injections on the thermo-fluid fields of plasma jets.
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