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

摘要

Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to ½ of a circumferential length on a particle surface is 30% or more by number. By forming the depressed portion on the surface of the regenerator material particles, it is possible to increase permeability of an operating medium gas and a contact surface area with the operating medium gas.

主权项

1. A group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 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, and a proportion of particles having a depressed portion having a length of 1/10 to ½ of a particle circumferential length on a particle surface is 30% or more by number.