Multi-cathode laminar flow plasma powder spheroidization device

Abstract

The invention provides a multi-cathode laminar flow plasma powder spheroidization device, which consists of an anode part, an interpole part, a cathode part, a power feeding part and an accessory, wherein the anode electrode part consists of an anode casing, an anode, a compression cover and the like. Each part is compressed and connected through screw bolts; the interpole part consists of an arcing ring, an insulation ring, an interpole, an interpole inner sleeve, an interpole outer sleeve and the like; the cathode part and the anode part are simultaneously compressed; the cathode part consists of a cathode case, a cathode sleeve, a cathode and a cathode fastening ring; each part is sequentially connected; the cathode compression ring is in contact with the cathode sleeve and is fixedly connected with the cathode case; the powder feeding part consists of a power feeding pipe and a powder feeding spray nozzle which are sequentially and fixedly connected. The excellent characteristics of good jet flow controllability, high enthalpy value, long jet flow length and the like of the laminar plasma are utilized for realizing the spheroidization on powder; the treated powder has the advantages of high spheroidization rate, high uniformity and the like.

Description

technical field [0001] The invention discloses a multi-cathode laminar flow plasma powder spheroidization device, which belongs to the field of thermal plasma generation devices. Background technique [0002] In recent years, thermal spraying and additive manufacturing have spheroidized powders, especially spherical particles of refractory metal powders such as tungsten and titanium (sphericity>98%, few hollow powders, satellite powders, bonding powders, etc.), particle size Basic characteristics such as narrow distribution (d50≤45μm), low oxygen content (<100ppm), high bulk density, and low impurity content put forward higher and higher requirements. Traditional powder spheroidization devices, such as turbulent plasma powder spheroidization devices, laser powder spheroidization devices, arc powder spheroidization devices, etc., either because of high cost of use, or because of poor powder spheroidization rate and consistency, or Due to its limited temperature and dif...

AI Technical Summary

Problems solved by technology

Due to the volume limitation of the plasma generator itself, the converging point is far away from the outlet of the plasma generator, so the high temperature zone of the plasma generator cannot be fully utilized for powder melting, and an additional power supply is required to preheat the wire, which restricts its powder processing Ability

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