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Rare-earth regenerator material particles, and group of rare-earth regenerator material particles, refrigerator and measuring apparatus using the same, and method for manufacturing the same

  • US 9,556,374 B2
  • Filed: 08/23/2010
  • Issued: 01/31/2017
  • Est. Priority Date: 08/25/2009
  • Status: Active Grant
First Claim
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1. Regenerator material particles, comprising a rare-earth metal and having an average particle size of 0.045 to 0.5 mm,wherein a proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number,a proportion of particles having a depressed portion haying a length of 1/10 to ½

  • of a particle circumferential length on a particle surface is 30% or more by number and wherein the depressed portion has a depth of 1/10 or less of a particle diameter, and the depressed portion has a channel-shape or a hole-shape, andwherein the number of the depressed portion per one regenerator material particle is 1 or 2.

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