Preparation of samarium--cobalt permanent magnets. [36. 7 Sm-63. 3 Co]
Technical Report
·
OSTI ID:7308123
Studies were conducted by the Bureau of Mines to develop a method for fabricating Sm--Co permanent magnets. This method consisted of arc-melting, crushing, and grinding the alloy, alining and pressing the powder, and sintering the green compacts. Results indicated that the optimum composition was 36.7 +- 0.3 weight-percent Sm and 63.3 +- 0.3 weight-percent Co. This composition was obtained by blending together Sm/sub 2/Co/sub 7/ and SmCo/sub 5/. The maximum values experimentally obtained were /sub M/H/sub c/ = 27.4 kOe, /sub B/H/sub c/ = 7,510 Oe, B/sub r/ = 7,810 G, and (BH)/sub max/ = 15.1 MGOe. The optimum sintering temperatures and grinding times for maximum /sub M/H/sub c/ and (BH)/sub max/ were determined. Lowering the grinding temperature from 0/sup 0/C to -60/sup 0/C resulted in a significant increase of magnetic properties. 14 figures, 4 tables.
- Research Organization:
- Bureau of Mines, Reno, NV (USA). Reno Metallurgy Research Center
- OSTI ID:
- 7308123
- Report Number(s):
- BM-RI-7784
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
COBALT ALLOYS
COBALT BASE ALLOYS
COMMINUTION
CRUSHING
FABRICATION
GRINDING
LOW TEMPERATURE
MACHINING
MAGNETIC PROPERTIES
MAGNETS
MATERIALS WORKING
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRESSING
RARE EARTH ALLOYS
SAMARIUM ALLOYS
SINTERING
TEMPERATURE EFFECTS
360101* -- Metals & Alloys-- Preparation & Fabrication
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
COBALT ALLOYS
COBALT BASE ALLOYS
COMMINUTION
CRUSHING
FABRICATION
GRINDING
LOW TEMPERATURE
MACHINING
MAGNETIC PROPERTIES
MAGNETS
MATERIALS WORKING
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRESSING
RARE EARTH ALLOYS
SAMARIUM ALLOYS
SINTERING
TEMPERATURE EFFECTS