Patent ID: 9556374
Date: 2017-01-31
CPC Classifications: B22F,B23P,C09K,C22C,F25B,G01R,H01F,Y10T

Claim:
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, and wherein the number of the depressed portion per one regenerator material particle is 1 or 2.