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    • 1. 发明授权
    • Device and method for making and collecting fine metallic powder
    • 制造和收集细金属粉末的装置和方法
    • US4533382A
    • 1985-08-06
    • US608112
    • 1984-05-08
    • Hirohisa MiuraHiroshi SatoToshio NatsumeHidenori Katagiri
    • Hirohisa MiuraHiroshi SatoToshio NatsumeHidenori Katagiri
    • B22F9/12B22F9/00
    • B22F9/12
    • Fine powder of a metal is made by vaporizing the metal in a vaporization chamber, mixing the metallic vapor with an inert carrier gas, and then adiabatically expanding the mixture through a nozzle, which preferably is a convergent-divergent nozzle. A jet flow from the nozzle is very rapidly cooled by this adiabatic expansion, which quickly condenses the metal vapor in the jet flow into very fine particles. Optionally the jet flow is directed against a metal powder collecting means, which may be a collection plate, but preferably is a bath of oil which entrains the particles and keeps them from agglomerating together by partially neutralizing their surface activity. Thus fine metal powder with particle diameters of the order of a few hundreds of angstroms can be economically produced.
    • 通过在蒸发室中蒸发金属,将金属蒸气与惰性载气混合,然后通过优选为收敛扩散喷嘴的喷嘴绝热地使混合物膨胀而制成金属细粉末。 来自喷嘴的射流通过这种绝热膨胀非常快速地冷却,这使得喷射流中的金属蒸气迅速冷凝成非常细的颗粒。 任选地,喷射流被引向金属粉末收集装置,金属粉末收集装置可以是收集板,但是优选地是一种油的浴,其夹带颗粒并通过部分中和它们的表面活性使它们不凝聚在一起。 因此,可以经济地制造粒径为几百埃的细金属粉末。