Abstract

Granular particles for cold storage material particles of an embodiment of the present invention contain: a rare earth oxysulfide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, or a rare earth oxide containing at least one of the above-mentioned rare earth elements; and carbon having a concentration of 0.001 wt% to 50 wt%. The relative density of said granular particles is 10% to 50%.

IPC Classes  ?

• C09K 5/02 - Materials undergoing a change of physical state when used
• C09K 5/14 - Solid materials, e.g. powdery or granular

Abstract

Provided are a magnetic cold storage material particle exhibiting low breakage rate even when long-term vibration by operation of a refrigerating machine is applied in an extremely low temperature range, a cold storage device wherein the refrigerating performance does not lower even under long-term operation due to inclusion of same, a refrigerating machine, and other apparatuses including the refrigerating machine such as a superconducting magnet. A magnetic cold storage material particle according to an embodiment of the present invention comprises an intermetallic compound containing a rare earth element, wherein the area ratio of voids located in a cross section thereof is 0.0001% to 15% inclusive. A cold storage device, a refrigerating machine, and other apparatuses including the refrigerating machine such as a superconducting magnet according to an embodiment of the present invention include the magnetic cold storage material particle according to the embodiment.

IPC Classes  ?

• C09K 5/14 - Solid materials, e.g. powdery or granular
• A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• G01N 24/00 - Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
• H01F 6/00 - Superconducting magnets; Superconducting coils

Abstract

The cold storage material according to an embodiment of the present invention includes a rare earth oxysulfide including one or more rare earth elements selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, the cold storage material including 0.001-10 atom% (inclusive) of a first group element, and being such that the maximum value of the specific heat capacity in a temperature range of 2-10 K (inclusive) is 0.5 J/(cm3·K) or greater.

IPC Classes  ?

• C09K 5/14 - Solid materials, e.g. powdery or granular
• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point

Abstract

Cold storage material particles according to one embodiment of the present invention contain: at least one first element that is selected from the group consisting of rare earth elements, silver (Ag) and copper (Cu); and a second element that is different from the first element and forms a polyvalent metal ion in an aqueous solution. With respect to the cold storage material particles, the atomic concentration of the second element is from 0.001% by atom to 60% by atom; and the maximum value of the volumetric specific heat at a temperature of 20 K or less is 0.3 J/cm3·K or more.

IPC Classes  ?

• A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• C09K 5/14 - Solid materials, e.g. powdery or granular
• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F28D 20/00 - Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups or
• G01N 24/00 - Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
• H01F 6/04 - Cooling

Abstract

Provided are a cold storage material which has large specific heat and small magnetization in a very low temperature region and has good manufacturability, and a method of manufacturing the same. Further provided is a refrigerator which is charged with the cold storage material and provides high efficiency and excellent cooling performance. Furthermore, a device incorporating a superconducting coil which is capable of reducing the influence of magnetic noise due to cold storage material is provided. A cold storage material of an embodiment is a granular body which is formed of an intermetallic compound comprising not less than 80 vol% of a ThCr2Si2-type structure (11), and which has a crystallite size of not more than 70 nm.

IPC Classes  ?

• C09K 5/14 - Solid materials, e.g. powdery or granular
• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• H01F 1/01 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
• H01F 6/04 - Cooling