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.
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Li, S., Mao, Y., Zhao, H., Pan, H., Huang, Z., Ge, S. (1994). Theory and Experiment for Rare-Earth Magnetic Regenerative Materials. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_79
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DOI: https://doi.org/10.1007/978-1-4757-9053-5_79
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