Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1980-05-22
1981-10-27
McCarthy, Helen M.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
501 1, 501152, 423593, 423594, C04B 3500, F25B 900, F28D 1700
Patent
active
042966086
ABSTRACT:
Ceramic material, and cryogenic refrigeration apparatus containing thermal energy absorbing elements made of the ceramic material, which is a dielectric insulator and has values of specific heat at selected temperatures below 15.degree. K. that are greater than or at least equal to the values of specific heat of pure lead at those same temperatures. Material consists essentially of a crystalline phase with a composition defined by the molar formula selected from: (1) AB.sub.2 O.sub.4 where A is Group 2b metal ions with or without other divalent metal ions and B is Cr ion with or without other trivalent metal ions, (2) AB.sub.2 O.sub.6 where A is Mn and/or Ni ion(s) with or without other divalent metal ions and B is Nb and/or Ta ion(s), and (3) A.sub.2 BCO.sub.6 where A is Pb ion with or without other divalent metal ions, B is Gd or Mn with or without other trivalent metal ions and C is Nb and/or Ta ion(s). Elements include regenerator packings, thermal dampers and dielectric insulation.
REFERENCES:
patent: 3638440 (1972-02-01), Lawless
Smolenskii, G. A., et al. Sov. Phys. Tech. Phys., vol. 3 (1958) pp. 1380-1382, 1981-1982.
Smolenskii, G. A., et al. Sov. Phys.-Solid State, vol. 1 (1960) pp. 907-908.
Venevtsev, Y. N., et al. J. Phys. Soc. Japan, vol. 28 Supp. (1970) pp. 139-144.
Ceramic Industry-Mar. 1960 "New Ceramic Materials" pp. 74-75.
Corning Glass Works
McCarthy Helen M.
Wardell Richard N.
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