The rare earth ceramic cold material and its manufacturing method oxisulfide, and using the cryogen

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PROBLEM TO BE SOLVED : To provide a ceramic cryogenic energy-storing material hardly causing fine powder or the like even after a long-time continuous operation by incorporating the material into a refrigerator, easily heat-exchangeable with a working medium, and having a large specific heat. SOLUTION : Granules of Gd2O2S is packed in a pipe of the Gd2O2S, and sintered. The granules are bound to each other, and the granules and the pipe are integrated by the shrinking power of the pipe at sintering. The pipe is formed into the porous one by molding the Gd2O2S with an organic material mixed therewith. COPYRIGHT : (C)2004, JPO