Microwave Absorption Behavior of Iron-Alumina Mixed Powder at Elevated Temperature
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- Sano Saburo
- National Institute of Advanced Industrial Science and Technology (AIST)
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- Takayama Sadatsugu
- National Institute of Advanced Industrial Science and Technology (AIST) National Institute for Fusion Science (NIFS)
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- Takao Yasumasa
- National Institute of Advanced Industrial Science and Technology (AIST)
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- Tsuzuki Akihiro
- National Institute of Advanced Industrial Science and Technology (AIST)
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- Makino Yukio
- JWRI, Osaka University
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説明
Recently, it has been reported that metal powders can be heated by microwave irradiation and many attentions have been attracted on the research field. More effectively heating of iron powder in H field than E field has also been reported. From this result, it is supposed that microwave absorbability of iron powder may change at Curie temperature since iron losses magnetism at the temperature. The objective of this work is to reveal the microwave absorption behavior of iron powder around Curie temperature. For this purpose, microwave absorption behavior of iron–alumina mixed powder at elevated temperature was measured by using a circular wave-guide fixture and a microwave vector network analyzer. When iron powder was subjected to a measurement, compact body of iron powder became a reflector for microwave above 700°C, hence any change of absorbability around Curie temperature (780°C) could not be obtained. When iron(50mass%)–alumina(50mass%) powder was subjected to measurement, drastic change of microwave absorbability was observed at Curie temperature. From the absorbability change around Curie temperature, it was estimated that contribution ratios of magnetic loss is 72% and of dielectric loss is 28% on microwave absorbability for iron(50mass%)–alumina(50mass%) mixed powder.
収録刊行物
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- ISIJ International
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ISIJ International 47 (4), 588-591, 2007
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390282681464476160
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- NII論文ID
- 10027022714
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- NII書誌ID
- AA10680712
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- 使用不可