Method for preparing high-temperature alloy GH4648 prills by adopting plasma auxiliary rotary electrode

Abstract

The invention relates to a method for preparing high-temperature alloy GH4648 metal spherical powder by adopting a plasma auxiliary rotary electrode centrifuging process. The method comprises the following steps of: generating a glow discharge plasma arc between a plasma auxiliary electrode and a consumption-type electrode made of rotary cylindrical high-temperature alloy GH4648 metal in a closed container protected by inert gas; forming droplets at one section of the high-temperature alloy GH4648 metal electrode close to the plasma arc by high temperature which is generated by the plasma arc; flinging the droplets out by centrifugal force; cooling the high-temperature alloy GH4648 metal droplets in air and solidifying into spheres in the inert atmosphere environment of the closed container; and collecting the high-temperature alloy GH4648 prills. The method changes process parameters so that high-temperature alloy GH4648 prills with an average sphere diameter from 0.05-1.2 mm and better monodispersity are obtained, have favorable degree of sphericity, lower malformed particle proportion and controllable sphere diameters and can be used in the field of a laser three-dimensional forming process for preparing special parts of an aerospace craft.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a method for preparing high-temperature alloy GH4648 metal pellets by using a plasma-assisted rotating electrode centrifugal process, and the prepared superalloy GH4648 metal pellets can be used for laser stereoforming and plasma coating processes . Structural materials used in the aerospace field. Background technique [0002] National Institute of Aerospace Special Materials and Technology, State Key Laboratory of Solidification Technology, laser three-dimensional molding process designed for special parts required in the fields of aviation and aerospace, requires a high temperature with small diameter, good sphericity, and good monodispersity Alloy GH4648 metal pellets are used as a functional special material. [0003] It is understood that there is no production of this kind of product in China at present, and there is a gas atomization process in foreig...

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Problems solved by technology

[0004] The present invention aims at the high-temperature alloy GH4648 metal pellets prepared by the existing foreign atomization method, which cannot meet the requirements of the laser three-dimensional forming process. The high-temperature alloy GH4648 metal ball can meet the needs of the National Institute of Aerospace Special Materials and Technology, the State Key Laboratory of Solidification Technology, and the laser three-dimensional forming process designed for special parts required in the fields of aviation and aerospace. Good, good monodispersity superalloy GH4648 metal pellet material

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