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):

Report Date:

1981-12-01

Pagination or Media Count:

70.0

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 ppmdecade to -1070 ppmdecade. 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.

Subject Categories:

  • Electrical and Electronic Equipment
  • Metallurgy and Metallography
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE