Theory and Experiment for Rare-Earth Magnetic Regenerative Materials

  • Shimo Li
  • Yihong Mao
  • Haoping Zhao
  • Hwaiyu Pan
  • Zhongping Huang
  • Shuangying Ge
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

To improve the performance of the regenerator of cryocoolers at temperatures below 15 K, we have developed several kinds of regenerate materials with extremely large specific heats per unit volume below 15 K. These materials are based on the magnetic rare-earth intermetallic compounds Er3Ni, (Er1−x Dy x )Ni2, Er0.9Yb0.1Ni2, Er1−x Ho x Ni2, and others.

In this paper, the basis for using these materials and the selection rule of the regenerate matrix are discussed briefly. We have used the magnetic material Er3Ni and rare-earthmetal hydrides (MH) as a partial substitution for lead in the second-stage regenerator of a two-stage G-M refrigerator. Test results showed that with optimal operating conditions and composition ratios, the lowest no-load temperature of the material containing Er3Ni decreased from 9.4 to 5.6 K. In material with a MH matrix, the lowest temperature was 8.4 K. At the same time, we have increased the refrigeration capacity and shortened pre-cooling times.

Keywords

Liquid Helium Metal Hydride Superfluid Helium Metal Hydride Refrigeration Capacity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    T. Hashimoto, M. Ogawa, R. Li, and K. Aoki, Recent progress on rare earth magnetic regnerator materials, p. 859 in “Advances in Cryogenic Engineering—Materials,” vol. 37B, Plenum, New York (1991).Google Scholar
  2. 2.
    H. Nakashima, Stirling cycle refrigerator test result below 5 K, p. 54 in “Proceedings of the International Cryogenic Engineering Conference,” vol. 10 (1984).Google Scholar
  3. 3.
    M. Nagao, T. Inaguchi, H. Yoshimura, T. Yamada, and M. Iwamoto, Helium liquefaction by a G-M cycle cryocooler, p. 1251 in “Advances in Cryogenic Engineering,” vol. 35, Plenum, New York (1990).Google Scholar
  4. 4.
    M. Nagao, Generation of superfluid helium by a G-M cycle cryocooler, in: “Cryocoolers - 6,” Plymouth, Massachusetts (1990).Google Scholar
  5. 5.
    T. Inaguchi, Two-stage G-M cycle cryocooler operating at about 4 K, in: “Cryocoolers -6,” Plymouth, Massachusetts (1990).Google Scholar
  6. 6.
    G. Cheng, Z. Tao, and L. Zhang, Solvay refrigerator operating in LHe temperature region, p. 35 in: “Proceedings of the 3rd National Cryogenic Engineering Conference” (in Chinese), September 23–27, 1992, Lanzhou, China.Google Scholar
  7. 7.
    S. Li, Y. Mao, H. Pan, and Z. Huang, Theory and test for rare earth regenerative matrix, p. 58 in: “Proceedings of the 3rd National Cryogenic Engineering Conference” (in Chinese), September 23–27, 1992, Lanzhou, China.Google Scholar
  8. 8.
    A. Daniels and F.K. du Pre, Triple expansion Stirling cycle refrigerator, p. 178 in: “Advances in Cryogenic Engineering,” vol. 16, Plenum, New York (1971).Google Scholar
  9. 9.
    R.W. Stuart, B.M. Cohen, and W. Hartwig, Operation and application of a three-stage closed cycle regenertive refrigerator in the 6.5K region, p. 428 in: “Advances in Cryogenic Engineering,” vol. 15, Plenum, New York (1970).Google Scholar
  10. 10.
    P.A. Rios and J.L. Smith, The effect of variable specific heat of the matrix on the performance of thermal regenerators, p. 566 in “Advances in Cryogenic Engineering,” vol. 13, Plenum, New York (1968).Google Scholar
  11. 11.
    G. Walker, A low-temperature problem: The regenerator material heat capacity, p. 34 in “Cryocoolers, Part 2: Applications,” Plenum, New York (1983).Google Scholar
  12. 12.
    L.L. Sparks, Specific heat, p. 47 in “Materials at Low Temperatures,” R.P. Reed and A.F. Clark, eds., American Society for Metals, Metals Park, Ohio (1983).Google Scholar
  13. 13.
    T. Hashimoto, M. Ogawa, R. Li, and K. Aoki, Recent progress on rare earth magnetic regenerator materials, p. 859 in: “Advances in Cryogenic Engineering,” vol. 37B, Plenum, New York (1991).Google Scholar
  14. 14.
    G.R. Gallagher and J.A. Crunkleton, Thermodynamic analysis of the Boreas cryocooler, in “Advances in Cryogenic Engineering,” vol. 39, Plenum, New York (1993).Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Shimo Li
    • 1
  • Yihong Mao
    • 1
  • Haoping Zhao
    • 1
  • Hwaiyu Pan
    • 1
  • Zhongping Huang
    • 1
  • Shuangying Ge
    • 1
  1. 1.Cryogenic LaboratoryZhejiang UniversityHangzhouChina

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