Accession Number:

ADA566254

Title:

Bulk Nanocomposite LaCo5/LaCo13 Magnets (POSTPRINT)

Descriptive Note:

Journal article

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

• Shen, Yuhui
• Turgut, Zafer
• Huang, Meiqing
• Horwath, John

Report Date:

2012-08-01

Pagination or Media Count:

5.0

Abstract:

The effects of processing parameters and composition on the magnetic properties and microstructure of nanocrystalline La-Co-based hard magnetic materials were investigated. Bulk nanocomposite LaCo5LaCo13 magnets were fabricated by mechanical alloying of LaCo5 and La2Co7 powder mixtures and subsequent hot pressing at 580-810 deg C. A high coercive field Hc of over 16 kOe with a smooth demagnetization curve was obtained in a composition range of 25-30 wt. La2Co7 when hot-pressed at 660-760 deg C. Microstructural investigations indicated that the magnets consist of a primary LaCo5 phase with grain sizes of 200-400 nm, coexisting with 20-100 nm grains of LaCo13 located both at the grain boundaries and within the hard LaCo5 grains.

Descriptors:

• *PERMANENT MAGNETS
• COERCIVE FORCE
• DEMAGNETIZATION
• GRAIN BOUNDARIES
• GRAIN SIZE
• HARDNESS
• HOT PRESSING
• MAGNETIC MATERIALS
• MICROSTRUCTURE
• NANOCRYSTALS
• REPRINTS

Subject Categories:

• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE