Preparation method of refractory tungsten carbide WC+W2C spherical powder

Abstract

The invention discloses a preparation method of refractory tungsten carbide WC+W2C spherical powder. The method comprises the steps that a tungsten carbide bar is preheated; the heated tungsten carbide bar is pushed into a length cutting support, and a rotating disc is used for acting on the length cutting support so that high-speed rotation of the tungsten carbide bar can be achieved; meanwhile, the tungsten carbide bar is pushed to move inside an atomization room through a bar moving mechanism; a plasma gun is used for emitting plasma jet to the end face of the tungsten carbide bar, the high-speed rotation tungsten carbide bar is atomized into molten drops in the atomization room, meanwhile, under the effect of surface tension of the scattered molten drops, and cooling is performed to obtain tungsten carbide powder through cooling mixing gas; finally, a powder collection room is used for separating the tungsten carbide spherical powder from the cooling mixing gas. In the atomization process, the anti-crack capacity of the rotating bar is improved; due to the fact that the bar is alternately heated before atomization, and the high temperature resistance material is made into the length cutting support, the powder dispersion and granularity distribution stability can be improved, and the number of non-spherical granules is decreased.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a refractory tungsten carbide WC+W which can be used for surfacing and spraying of wear-resistant layers, for example, as the initial material for surfacing and spraying of flux-cored wire. 2 The preparation method of C spherical powder. Background technique [0002] At present there is a production method and apparatus for spherical surfacing materials (SU 503 688, 1976.02.25), comprising a vacuum chamber containing a rotatable graphite crucible, and the vacuum chamber cover is movable. The vacuum chamber is covered with non-consumable tubular electrodes. This spherical powder preparation method for surfacing involves generating an electric current between a rotating graphite electrode (anode) and a non-consumable tungsten tube cathode, and the raw material is heated under the action of an arc after entering the crucible. The molten metal formed in the crucible rises to the ed...

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Problems solved by technology

However, a concave cavity of the required shape is formed on the end surface of the bar to ensure the stability of the geometric dimension of the bar during the high-speed rotary atomization process. For the process parameters, the distance between the end of the bar and the plasma nozzle needs to be kept very accurate, which is hard to reach

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