Alternative approaches for reactive surface coating on rare earth magnet alloy particulate

Nathaniel T. Oster, Iver E. Anderson, Wei Tang, Yaqiao Wu, Kevin W. Dennis, Matthew J. Kramer, R. W. Mccallum

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Mixed rare earth (MRE) magnetic alloy particulate of the MRE2Fe14B type readily forms a brittle, nonprotective oxide layer upon exposure to ambient air. Efforts have been made to passivate MRE magnet alloy powders through the creation of a fluoride surface layer. Previous studies have shown that this can be effectively accomplished either by exposing as-received powder to nitrogen trifluoride at elevated temperatures in a fluidized bed apparatus or in situ, during synthesis of the powder by gas atomization. Another recently developed method of coating as-received powders is through the use of a rotating kiln apparatus. This study is a preliminary comparison of the two different methods of fluoride coating for asreceived powder. Crushed MRE2Fe14B melt spun ribbon powders were fluorinated using the two methods and compared through the use of x-ray photoelectron spectroscopy, auger electron spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Preliminary results indicate that coatings created by the two different methods are comparable.

Original languageEnglish
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - 2008, Proceedings of the 2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008
Pages6131-6141
Number of pages11
StatePublished - 2008
Event2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008 - Washington, DC, United States
Duration: 8 Jun 200812 Jun 2008

Publication series

NameAdvances in Powder Metallurgy and Particulate Materials - 2008, Proceedings of the 2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008

Conference

Conference2008 World Congress on Powder Metallurgy and Particulate Materials, PowderMet 2008
Country/TerritoryUnited States
CityWashington, DC
Period8/06/0812/06/08

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