Improvement of magnetic properties of the permanent magnet; Effect of Al2O3 and Cr2O3 additives on Sr-ferrite.
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- Kaneko Yuji
- 住友特殊金属(株)技術開発部
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- Anamoto Shuji
- 住友特殊金属(株)技術開発部
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- Hamamura Atsushi
- 住友特殊金属(株)技術開発部
Bibliographic Information
- Other Title
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- Al2O3およびCr2O3添加によるSrフェライト磁石の高性能化
- Al2O3 オヨビ Cr2O3 テンカ ニ ヨル Sr フェライト ジシャク
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Description
The effect of Al2O3 and Cr2O3 additives was investigated on Curie temperature, lattice constants, magnetic properties and particle shapes of the calcinated Sr-ferrite, and on the permanent magnet properties of the sintered Sr-ferrite. With increasing the amount of Al2O3 additives, Curie temperature was decreased, the lattice constant was contradicted and the intrinsic coercivity was considerably increased. In case of Cr2O3 additives, Curie temperature was slightly decreased, but little change was observed on lattice constant. The intrinsic coercivity was slightly increased. In terms of the additive effects, the intrinsic coercivity of the sintered Sr-ferrite showed a similar tendency to that of the calcinated Sr-ferrite. It could be concluded that the Al2O3 additive controlled the intrinsic coecivity by forming solid solution with Sr-ferrite, and Cr2O3 additive behaves to control the grain growth of Sr-ferrite. By simultaneous adding of SiO2 and Al2O3 or Cr2O3 additives in pre-calcinating stage, we have cleared the hurdle of obtaining the high quarity magnets of Br=4.1 KG, iHc=4.0 KOe and or Br=3.8 KG, iHc=5.0 KOe, which were keenly claimed by car motor makers.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 34 (7), 318-324, 1987
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390282681283993600
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- NII Article ID
- 130000813135
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 3154557
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed