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Mechanical properties for spheres of erbium-based magnetic regenerator materials fabricated by centrifugal atomization.

[In Japanese. / En japonais.]

Author(s) : OKAMURA M., SORI N.

Type of article: Article

Summary

Various magnetic regenerator materials, such as erbium(3)-nickel, erbium(3)-cobalt, erbium-nickel, erbium-nickel(2), are fabricated in the form of a spherical particle by centrifugal atomization. 4 K level refrigeration has been achieved by a Gifford-McMahon refrigerator using these materials. The study used spherical particles with a diameter range of 0.18-0.25 mm as test samples. The compressive stress of 20 megapascals was applied to these spherical particles and no fractured spheres were found in the scope of observation. A few spheres were fractured by the compressive stress of at least 50 megapascals. No fractured spheres were observed after the vibration test. In practice, the reliability of erbium(3)-nickel spheres has been confirmed by a long-run test of 7,700 hours in a usual Gifford-McMahon refrigerator.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1997-1306
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 31 - n. 4
  • Publication date: 1996
  • Document available for consultation in the library of the IIR headquarters only.

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