New alnico magnets fabricated from pre-alloyed gas atomization powder through diverse consolidation techniques

Author

Tang, W. ; Zhou, L. ; Kassen, A. ; Palasyuk, A. ; White, E. ; Dennis, K.W. ; Kramer, M.J. ; Mccallum, R.W. ; Anderson, I.E.

Author_Institution

Mater. Sci. & Eng., Ames Lab. of DOE, Ames, IA, USA

fYear

2015

fDate

11-15 May 2015

Firstpage

1

Lastpage

1

Abstract

Recent concern for supply and price of rare earth (RE) metals has stimulated the search for alternative magnets [1]. Alnico is an attractive non-RE magnet alloy due to its excellent magnetic stability. However, the best energy product (BH)_max of the magnets is only about 10 MGOe. A key to improving the magnetic properties is to enhance coercivity H_ci by optimizing composition and microstructure [2]. While our efforts focus on how to improve the magnetic properties, new fabrication technologies of bulk alnico magnets are widely studied as well. In this study, fine spherical powder produced by gas atomization (GA) was consolidated through Hot Pressing (HP), Hot Isostatic Pressing (HIP), and Compression Molding and subsequently Sintering (CMS) techniques. The effects of different fabrication techniques and processing parameters on microstructure and magnetic properties were studied and discussed.

Keywords

aluminium alloys; cobalt alloys; compression moulding; hot pressing; iron alloys; magnets; nickel alloys; powder technology; sintering; AlNiCoFe; Compression Molding; Hot Isostatic Pressing; Hot Pressing; Sintering; alnico magnets; alternative magnets; consolidation techniques; energy product; magnetic stability; prealloyed gas atomization powder; Hip; Magnetic anisotropy; Magnetic properties; Magnetic resonance imaging; Microstructure; Powders; Scanning electron microscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference (INTERMAG), 2015 IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4799-7321-7

Type

conf

DOI

10.1109/INTMAG.2015.7156514

Filename

7156514