Planar high energy permanent magnets
Abstract
Samarium-cobalt permanent magnets were fabricated by arc plasma spraying in order to evaluate this technique as an economical method for fabricating cobalt-rare earth magnets for advanced traveling wave tubes and crossfield amplifiers. Bar magnets were produced having a coercive force of 6100 oersteds and an energy product of 10.8 million gauss-oersted. The magnetic properties in bar magnets were significantly better in the direction parallel to the spray direction. SmCo5 bar magnets were directly bonded to magnesia-excess spinel substrates and showed no evidence of cracking or warping in the magnet-substrate assembly even after heat treatment. Two 52-bar magnet assemblies were constructed, each consisting of two 26-bar arrays, 1 inch x 8 inch. The bar magnets were magnetized so as to achieve peak axial field strengths of 450 to 500 gauss with a period of 0.6 inch in each assembly.
- Publication:
-
Final Report
- Pub Date:
- July 1975
- Bibcode:
- 1975mrcd.reptR....W
- Keywords:
-
- Cobalt Compounds;
- Magnets;
- Plasma Spraying;
- Samarium Compounds;
- Crossed Field Amplifiers;
- Planar Structures;
- Traveling Wave Tubes;
- Electronics and Electrical Engineering