Accession Number : ADA114955

Title :   Materials Research for Advanced Inertial Instrumentation; Task 3: Rare Earth Magnetic Material Technology as Related to Gyro Torquers and Motors.

Descriptive Note : Research rept. 1 Oct 80-30 Sep 81,

Corporate Author : CHARLES STARK DRAPER LAB INC CAMBRIDGE MA

Personal Author(s) : Das,D ; Kumar,K ; Wettstein,E

PDF Url : ADA114955

Report Date : Dec 1981

Pagination or Media Count : 70

Abstract : Preliminary measurements of flux decay rates of high coercivity and high energy product hot isostatically pressed (HIPed) SmCo5 magnets show that an increase of samarium content by one weight percent, increasing the Sm2Co7 second phase, raises the decay rate from -43 ppm/decade to -1070 ppm/decade. This finding may prove to be extremely valuable for producing high stability SmCo5 magnets. Oxygen contaminatio, determined to be the other major cause of instability, is expected to be significantly lowered with the use of the facilities being developed for fabrication of oxygen-free SmCo5 magnets with the support of a related program.

Descriptors :   *Magnets, *Samarium compounds, *Cobalt compounds, *Plasma spraying, *Gyroscopes, Arc spraying, Powder metallurgy, Hot pressing, Isostatic pressing, Sintering, Temperature, Thermal expansion, Permanent magnets, Flux(Rate), Stability, Decay, Annealing, Motors, Torque

Subject Categories : Electrical and Electronic Equipment
      Metallurgy and Metallography
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE