Accession Number : AD0780085

Title :   Planar High Energy Permanent Magnets.

Descriptive Note : Semi-annual rept. 1 Oct 73-28 Feb 74,


Personal Author(s) : Willson,M. C. ; Janowiecki,R. J.

Report Date : MAY 1974

Pagination or Media Count : 50

Abstract : The purpose of the program is to demonstrate the feasibility of fabricating cobalt-rare earth permanent magnets by the arc plasma spraying process. Property goals for spray-fabricated magnets consisted of a coercive force of 6000 oersteds and an energy product of 8 million gauss-oersteds. During this reporting period, magnet samples were fabricated in disk and tube shapes mostly using a spray powder of nominal composition 37.2 wt.% Sm-Co. Magnetic properties of sprayed magnets were enhanced by post-spray heat treatment and aging. Conventional and novel heat treatment methods were investigated. Second and third quadrant demagnetization curves were obtained. Density, microstructure, crystallographic orientation, reproducibility and thermal stability were studied. The best magnet produced during this program displayed a coercive force of approximately 5000 oersteds and an energy product of 7.3 million gauss-oersteds. (Author)

Descriptors :   *Permanent magnets, Cobalt, Magnets, Rare earth compounds, Plasmas(Physics), Electric arcs, Intermetallic compounds, Fabrication, Samarium compounds, Cobalt compounds, Traveling wave tubes

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE