Method for preparing cobalt-base alloy CoCrMo prills by adopting plasma auxiliary rotation electrodes

Abstract

The invention relates to a method for preparing cobalt-base alloy CoCrMo prills by adopting a plasma auxiliary rotation electrode centrifugation process, comprising the following steps of: generating a glow discharge plasma arc between a plasma auxiliary electrode and a consumed electrode made of rotary cylindrical cobalt-base alloy CoCrMo in an airtight container with inert atmosphere protection; enabling one section of a cobalt-base alloy CoCrMo electrode to form small drops at high temperature generated by the plasma arc, wherein one section of the cobalt-base alloy CoCrMo electrode is close to the plasma arc; ejecting the small drops by using centrifugal force; and carrying out air cooling and solidification to the cobalt-base alloy CoCrMo small drops into a spherical shape in the inert atmosphere environment of the airtight container to obtain the cobalt-base alloy CoCrMo prills. The method can obtain better-monodispersion cobalt-base alloy CoCrMo prills with the averaged sphere diameter of 0.05mm to 1.0mm by changing process parameters. The prepared prills have favorable degree of sphericity, lower abnormal particle proportion and controllable sphere diameter and can be used for preparing bioengineering materials and special parts of aerospace planes in the fields of laser stereoscopic moulding processes and hot-press moulding processes.

Description

technical field [0001] The invention relates to the technical field of biometal material preparation, in particular to a method for preparing cobalt-based alloy CoCrMo metal pellets by adopting a plasma-assisted rotating electrode centrifugal process, and the prepared cobalt-based alloy CoCrMo metal pellets can be used in a laser three-dimensional forming process. Thermoforming process. It is used in the field of bioengineering materials and aerospace structural materials. Background technique [0002] The National Institute of Aerospace Special Materials and Technology, the laser three-dimensional molding process designed for special parts required in the fields of aviation and aerospace, and the hot pressing molding process designed by Harbin Institute of Technology for bioengineering materials require a small diameter, spherical shape Cobalt-based alloy CoCrMo metal pellets with good monodispersity are used as a functional special material. [0003] It is understood tha...

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Problems solved by technology

[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 to prepare similar spherical materials in China, which is called atomization method.

The basic principle of this method is to use the container space, combined with the melt spray process, the cobalt-based alloy CoCrMo metal pellets obtained, if applied to the laser three-dimensional forming process, and the hot pressing forming process has the following problems: 1. The atomization method prepared Cobalt-based alloy CoCrMo metal balls, unable to control the effective interval particle size

2. The cobalt-based alloy CoCrMo metal balls prepared by the atomization method have poor sphericity, and the proportion of oval and deformed particles is about 89%.

3. The cobalt-based alloy CoCrMo metal balls prepared by the atomization method have a large number of pores and poor mechanical strength

In general, the cobalt-based alloy CoCrMo metal pellets prepared by the current atomization method cannot meet the requirements of the laser three-dimensional forming process and the hot pressing forming process.

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