Alloyed spherical powder preparation device and method for laser 3D (three-dimensional) printing

Abstract

The invention relates to a high-performance alloyed spherical powder preparation device and method for laser 3D (three-dimensional) printing. The device comprises a vacuum acquirement and inflation system, an induction smelting system, an atomization powder preparation system, a power collection system and a power system. The preparation method includes that: (1) the induction smelting system selects a non-crucible induction system or a crucible induction system; (2) alloy bars are fixed on a continuous feeder, or nickel-based / cobalt-based alloy bars are put in a smelting chamber; (3) the smelting chamber, an atomizing chamber and a power collection device are vacuumized prior to be fed with inert gas; (4) induction smelting is started, when alloy reaches preset temperature, alloy droplets are enabled to enter the atomization powder preparation system, and nozzles are started to perform atomization powder preparation; alloyed power prepared in the atomization chamber is collected through the powder collection device. The device can realize mechanical control, automatic control and real-time monitoring; the prepared alloy powder is high in yield, uniform in particle size distribution, good in degree of sphericity, uniform in chemical component, good in mobility, low in oxygen content and low in hollow sphere rate.

Description

Technical field [0001] The invention belongs to the technical field of laser 3D printing metal powder preparation, and in particular relates to a device and method for preparing spherical alloy powder for laser 3D printing. [0002] technical background [0003] Laser 3D printing technology is a new type of advanced "additive manufacturing" technology without molds, rapid, flexible, and fully dense direct forming. It can not only be used for the rapid forming of three-dimensional (3D) solid metal parts with strong mechanical loads, but also can be applied For the repair of parts with more complex shapes and larger volumes, manufacturing defects, misprocessing damage or service damage. Laser 3D printing technology is an ideal process for preparing high-performance nickel-based alloys, titanium alloys, iron-based alloys and other key components. my country has taken laser 3D printing technology as one of the high-tech strategic research and development in the "13th Five-Year Plan". ...

AI Technical Summary

Problems solved by technology

However, because high-performance structural parts for laser 3D printing have special requirements for powder characteristics such as sphericity, particle size distribution, oxygen content, fluidity, and hollow sphere ratio of alloy powders, at present, there is still a lack of materials that can meet these special requirements in China. Advanced preparation equipment and supporting technology of high-performance alloy powder for laser 3D printing

[0007] At present, the main problems in the preparation of high-performance metal alloy powders for laser 3D printing by domestic induction melting are: on the one hand, the production rate, sphericity, composition uniformity, fluidity, particle size distribution, oxygen content and Powder characteristic indicators such as hollow sphere ratio can not meet the needs of laser 3D printing high-performance metal key parts; The degree of automation of the equipment is very low, the collected powder needs to be sieved after being mixed together, the human influence factors in the gas atomization process are large, and the consumption of inert gas is high

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