Evaluation of mechanical properties for spherical magnetic regenerator materials fabricated by rapid solidification process
- Toshiba Co., Yokohama (Japan); and others
Various magnetic regenerator materials, such as Er{sub 3}Ni, Er{sub 3}Co and ErNi, are fabricated in the form of a spherical particle by a rapid solidification process. 4 K level refrigeration has been obtained by a GM refrigerator using these materials. However, the magnetic regenerator materials are considered brittle, as they are intermetallic compounds. It is important to evaluate the mechanical properties of these materials to confirm reliability as a regenerator material. In this paper, experimental results of compression and vibration tests for magnetic regenerator materials are described. The technical point of this study is to use spherical particles as test samples. The compressive stress of 20 MPa was applied to these spherical particles and no fractured spheres were observed. Similarly, no fractured spheres were found after the vibration test, in which the maximum acceleration was 30 X 9.8 m/s{sup 2} and the number of vibration times was 1 X 10{sup 6}, insofar as there was no room to stir spherical particles in a regenerator. In practice, the reliability of magnetic regenerator materials has been confirmed by a long-run test of 7,000 h in a usual GM refrigerator.
- OSTI ID:
- 476731
- Report Number(s):
- CONF-950722--
- Journal Information:
- Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42A; ISSN ACYEAC; ISSN 0065-2482
- Country of Publication:
- United States
- Language:
- English
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