PURPOSE: To obtain a uniform mixture of ultra-fine particles with good efficiency, by respectively forming at least two kinds of ultra-fine particles in separate forming chambers and introducing the same into feed pipes by carrier gas to unite the feed tubes to meet the particle streams.
CONSTITUTION: A material A (Ag) and a material B (Fe) are respectively prepared in a first forming chamber and a second forming chamber and, after evacuation, both materials A, B are evaporated under heating to form ultra-fine particles with a particle size of 100. The formed ultra-fine particles are respectively introduced into feed pipes 21, 22 by carrier gas H2 and both particle streams are met at a forward area passing a double pipe part 24 in the same flow direction to be discharged to a discharge chamber 3 as an uniformly mixed feed stream. The inner diameter of the feed pipe 21 is 1.6mm and that of the feed pipe 22 is 4.5mm and the differential pressure between the first and second forming chambers is generally set to a range of 30W150 torr to obtain a good confluent mixture. By this method, even from metals or metal compounds capable of not being evaporated in the same evaporation chamber, an extremely uniform powdery mixture can be prepared.
KASHIYUU SEIICHIROU
HAYASHI CHIKARA
FUCHIDA HIDETSUGU
KASHIYUU SEIICHIROU
HAYASHI CHIKARA