Refrigeration – Refrigeration producer – Evaporator – e.g. – heat exchanger
Patent
1979-04-13
1980-11-04
McCarthy, Helen M.
Refrigeration
Refrigeration producer
Evaporator, e.g., heat exchanger
106 395, 106 732, 106302, 165 10, 252 70, 252 6251, 252 632, 423595, 62 6, C04B 3542, C09K 500, F25B 1900, F28D 1700
Patent
active
042312310
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: 3165419 (1965-01-01), Bayer
patent: 3438724 (1969-04-01), Hartford et al.
patent: 3523574 (1970-08-01), Haskin
patent: 3595810 (1971-07-01), Kehl
patent: 3638440 (1972-02-01), Lawless
patent: 3650117 (1972-03-01), Robinson et al.
patent: 3832205 (1974-08-01), Lowery
patent: 4075029 (1978-02-01), Nuss
patent: 4082138 (1978-04-01), Miedema et al.
Ceramic Industry-Mar. 1960 "New Ceramic Materials" pp. 74-75.
Corning Glass Works
McCarthy Helen M.
Wardell Richard N.
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