| 摘要 |
PURPOSE:To produce composite metallic powder suitable for a sintering material with a simple stage by supplying reinforcing powder having a high m.p. from the upper part of the central hole of a nozzle for spraying molten metal flow and uniformly distributing the reinforcing particles. CONSTITUTION:The molten metal 5 of an Ni-base alloy, etc. having a prescribed compsn. is poured into a tundish 4 and is dropped in the form of the molten metal flow 3 from the bottom of the tundish 4 toward the central hole 1a of the spraying nozzle 1. High-pressure fluid 10 such as gaseous Ar is supplied to the nozzle 1 to form a spraying medium 2 of an inverted circular circular cone shape internally having a negative pressure to the bottom surface of the nozzle 1. The reinforcing powder 8 of the granular or short fiber-like Y2O3, etc. having the high m.p. is supplied through a supply pipe 7 in this state from the upper side of the central hole 1a of the nozzle 1. The reinforcing powder 8 is combined with the molten metal which is pulverized at the top end part of the spraying medium 2. The composite metallic powder 9 in which the reinforcing powder 8 is finely and uniformly dispersed is obtd. by the above- mentioned method.
|
