| 摘要 |
PURPOSE:To produce ultrafine metallic particles having high quality at a high yield by introducing a small amt. of carbon dioxide into a vacuum chamber, forming a dry ice film on a capturing plate and sticking the ultrafine metallic particles generated from a heating furnace thereon. CONSTITUTION:The inside of a chamber 1 connected to a vacuum pump 6 is evacuated to a vacuum and a metal is melted to evaporate with a heating furnace 2 is said chamber to generate ultrafine metallic particles. On the other hand, a small amt. of carbon dioxide is introduced through a carbon dioxide introducing pipe 5 into the chamber and a capturing plate 3 disposed to face the furnace 2 is cooled by a refrigerant in a refrigerant conduit pipe 4 to form a dry ice film 7 thereon. The above-mentioned ultrafine metallic particles are stuck to and captured by said film 7 and thereafter the dry ice is sublimated to obtain the ultrafine metallic particles. The ultrafine metallic particles are stuck in laminated layers via the dry ice film by repeating plural times the formation of the film 7 and sticking of the ultrafine metallic particles by the above-mentioned method, by which the ultrafine metallic particles are recovered with the higher efficiency.
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