Accession Number : AD0772836

Title :   Research to Investigate the Aging Characteristics of Samarium Cobalt Magnets.

Descriptive Note : Semiannual rept. 1 Jan-30 Jun 73,


Personal Author(s) : Mildrum,Herbert F. ; Strnat,Karl J.

Report Date : SEP 1973

Pagination or Media Count : 123

Abstract : The principal objective of the program is to investigate the aging stability of commercially produced sintered SmCo5-based permanent magnets from two domestic sources. Current results of measurements of certain engineering design parameters are reported, although many tests are still in progress. Investigations were conducted thus far on cylindrical magnet samples having a B sub d/H sub d = 1. These have included: 'Natural' air and vacuum aging at room temperature; natural air aging at room temperature after a prestabilizing heat treatment ('thermal knockdown'); and accelerated thermal air aging at temperatures between 150 and 300C. Reversible temperature coefficients and irreversible losses have been measured during repeated thermal cycling between -100 to +300C. Changes in the hysteresis loop shapes and demagnetization curves before and after exposure are also presented and discussed. (Author)

Descriptors :   *Permanent magnets, Samarium compounds, Cobalt compounds, Aging(Materials), Magnetic properties, Intermetallic compounds, Rare earth compounds, Magnets

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE