Cold accumulating material, method of manufacturing the same and refrigerator using the material
US6467277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jul 18, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2309/003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cold accumulating material comprising a number of magnetic particles mainly composed of oxide, wherein an average value of equivalent circle diameters of crystal grains constituting the magnetic particles is 0.3-20 &mgr;m. It is preferable that an area ratio of the crystal grains each having an equivalent circle diameter of 50 &mgr;m or more is 10% or less with respect to whole crystal grains constituting the magnetic particle. According to the above structure, there can be provided a cold accumulating material which is free from being finely pulverized, and is excellent in thermal shock resistance and durability, and capable of exhibiting a significant refrigerating performance at low temperature range for a long period of time in a stable condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.