COLD STORAGE MATERIAL AND MANUFACTURE THEREOF

PURPOSE:To provide a heat storage material excellent in cold storage effect by combining a high specific heat fine powdered material having a specific heat and a good conductivity low melting point flexible metal having a specific melting point, and thereafter forming the composite material in many granulated particles. CONSTITUTION:A cold storage material is constructed by combining in (5:5)-(8:2) mixing ratio a high specific heat fine powdered material 1 having a specific heat of 1J/g.k or more and a good heat conductivity low melting point flexible metal 2 having a melting point of 400 deg.C or lower and thereafter forming the composite material in many granules 2a. Thereupon, the high specific material 1 is one or a mixture of erbium 3 nickel, holminium 3 ruthenium, erbium 3 ruthenium and others, and the low melting point flexible metal 2 is one or a mixture of lead, solder, indium and others. Hereby, there is ensured a cold storage material which has a greater specific heat at cryogenic temperature and is excellent in flexibility and thermal conductivity, and which prevents fine powder to be produced even with its use over a long time.