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    • 3. 发明公开
    • Highly concentrated supersonic material flame spray method and apparatus
    • 高浓度超材料火焰喷涂方法和装置
    • EP0136978A3
    • 1985-12-27
    • EP84810431
    • 1984-09-04
    • Browning, James A.
    • Browning, James A.
    • B05B07/20H05H01/42B05D01/06
    • B05B7/16B05B7/18B05B7/203B05B7/205B05B7/226H05H1/42
    • @ Particulate material, which may be heat softened or liquified, or which may remain solid, is fed outside of an electrical heating zone (2) for electric arc heating under pressure a continuous flow of heated gas (7), or outside of a combustion chamber (114) producing high pressure, high temperature products of combustion, axially into the converging flow of the heated gas or products of combustion while entering a converging portion (121a) of a flow expansion nozzle (41, 120) having a nozzle bore (41, 121) of a length that is at least five times the diameter of the nozzle bore. This restricts the diameter of the column of particles (P) passing through the nozzle bore to prevent build up of particle material on the nozzle bore, if molten or heat softened, while insuring sufficient dwell time within the bore to effect particle heat softening or melting, or if the particles are solid, to prevent abrasion of the nozzle bore wall by the particles while accelerating the particles to supersonic velocity.
    • 可以被热软化或液化或可能保持固体的颗粒材料被供给到电加热区域(2)外部,用于在加压的气体(7)的加热气体或燃烧室外部的压力下进行电弧加热 (114),当进入具有喷嘴孔(41,120)的流动膨胀喷嘴(41,120)的会聚部分(121a)时,产生高压,高温的燃烧产物,轴向地进入加热气体或燃烧产物的会聚流 ,121),其长度为喷嘴孔直径的至少五倍。 这限制了通过喷嘴孔的颗粒(P)的直径,以防止在熔融或热软化时在喷嘴孔上积聚颗粒材料,同时确保在孔内具有足够的停留时间以实现颗粒热软化或熔化 ,或者如果颗粒是固体的,则防止颗粒在将颗粒加速到超音速的同时磨损喷嘴孔壁。