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Magnet Properties of Alloys Containing Lanthanum, Cobalt, Copper, and Magnesium.

Walkiewicz-JW; Wong-MM
MISSING :16 pages
One of the objectives of the Bureau of Mines is to develop substitution technology for scarce materials. In accordance with this goal, alloys containing lanthanum, cobalt, copper, and magnesium were investigated for fabrication of rare-earth-cobalt (re- co) permanent magnets. A complete substitution of lanthanum for samarium and a partial substitution of copper for cobalt was accomplished. Magnets of la-co and la-co-cu-mg alloys were fabricated by powder metallurgy techniques and evaluated. A maximum intrinsic coercivity of 23.2 Koe was obtained with a la-co-cu-mg alloy. In comparison, maximum values of 9.3 Koe and 11.6 Koe were obtained with la-co and la-co-cu alloys, respectively. The substitution of copper and magnesium for part of the cobalt resulted in a large increase of intrinsic coercivity, similar to the results of Bureau research with mischmetal-co-cu-mg alloys. Unlike the mischmetal-co-cu-mg magnets, the la-co-cu-mg magnets showed signs of physical deterioration on exposure to air. The effects of fabrication parameters on the magnetic properties of the la-co-cu-mg alloys were also determined.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
Identifying No.
RI 8693
NIOSH Division
Source Name
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division