記録用磁性材料　　Ｎｄ‐Ｆｅ‐Ｂ系スプレー造粒粉中のＰＶＡの熱分解挙動

• 槇田 顕

  住友特殊金属(株)研究開発部

• 山下 治

  住友特殊金属(株)研究開発部

• 千田 哲也

  理学電機(株)製品事業部

書誌事項

タイトル別名

• Thermal Decomposition Behavior of PVA as Organic Binder of Spray Dried Nd-Fe-B System Powder.
• Nd Fe Bケイ スプレー ゾウリュウ フンチュウ ノ PVA ノ ネツ ブ

抄録

Debinding process under hydrogen atmosphere is effective to eliminate the residual carbon contents in Nd-Fe-B system green body which is compacted by using spray dried powder. But it is not effective for elimination of residual oxygen contents comparatively. The emitted gas from compacted body of Nd-Fe-B system spray dried powder including poly(vinyl alcohol)(PVA) as a binder was analyzed by mass spectroscopy. Much emission of a fragment with m/z=16 was observed only when spray dried powder was heated under hydrogen atmosphere. The fragment was proved to be methane by gas chromatography. DTA curve measured simultaneously for spray dried powder showed absorption of hydrogen by Nd-Fe-B in the vicinity of 220°C, and the desorption of hydrogen started above 230°C. The latter was accompanied by enhancement of the emission of hydrocarbon such as methane. Hydrogen atom sent out from Nd-Fe-B powder would make the fragments from main chain of PVA stable, and accelerates the debinding by vaporization of methane and other hydrocarbon with low mass number. In contrast, degraded side-chain of PVA would immediately combine with neodymium of Nd-Fe-B powder and form Nd₂O₃ which remains in the sintered body.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 45 (7), 646-651, 1998

  一般社団法人 粉体粉末冶金協会

キーワード

• Nd-Fe-B magnets
• spray drying
• poly (vinyl alcohol)
• mass spectroscopy
• gas chromatography

詳細情報

• CRID: 1390282681285633152
• NII論文ID: 10002052414
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.45.646
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 4535709
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4535709
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可