Preparing method of copper alloy powder for additional manufacturing with selective laser melting

Abstract

The invention relates to a preparing method of copper alloy powder for additional manufacturing with selective laser melting. The preparing method is characterized by comprising the preparation stepsof preparing copper alloy bars; then conducting machining treatment of peeling and cutting-off of head and tail defective parts, and conducting drying and preheating after surface cleaning; conductingmelting under protective atmosphere; making the copper alloy liquid obtained after melting pass through a metal liquid flow guide pipe, and then forming copper alloy powder in a powder spraying tower; conducting vibrating screening on the formed copper alloy powder; and conducting air classification on the copper alloy powder obtained after vibrating screening. According to the preparing method,the copper alloy bars prepared through vacuum induction melting are powdered by atomization through a tight coupling argon atomization technology, then vibration separation is conducted to remove coarse powder with the particle size of 53 micrometers, an inert gas medium conducts air classification to remove fine powder with the particle size of 15 micrometers, and the obtained copper alloy powderhas the advantages of uniform chemical components, low oxygen content, high degree of sphericity, low hollow sphere rate and high fluidity, and meets the special requirements of the technology of additional manufacturing with selective laser melting for the performance of powder.

Description

technical field [0001] The invention discloses a preparation method of copper alloy powder for laser selective melting additive manufacturing, and relates to a preparation method of metal alloy powder. Background technique [0002] High-conductivity copper alloys are widely used in military industry, aerospace, shipbuilding, high-speed rail, subways, electric vehicles, communication equipment and other fields, but 50% of the high-conductivity copper alloys my country needs every year rely on imports. The additive manufacturing technology of high-conductivity copper alloy has the advantages of good electrical conductivity, less material required, and can reduce the weight of aircraft and ships in aerospace, ship and other application fields, and can load more other equipment. In recent years, with the development of 3D printing technology, the 3D printing technology of copper alloy has been conquered at home and abroad. First, NASA made a breakthrough in the 3D printing of t...

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Problems solved by technology

[0003] At present, there are few domestic researches on the preparation of copper alloy powders for laser selective melting additive manufacturing technology, and the main problems are the difficulty in the preparation of fine particle size powders and the low yield of fine powders.

Chinese patent "A method for preparing copper alloy powder based on plasma rotating electrode" (CN 109014228A) and Chinese patent "A method for preparing copper alloy powder for additive manufacturing" (CN 109112346 A) both proposed the use of rotating electrode method ( PREP) method for preparing copper alloy powder, the copper alloy powder prepared by the rotating electrode method has good sphericity and low impurity content, but the biggest problem with the rotating electrode method is that the yield of fine powder is low, and the fine powder of <53 μm is very little, while Selective Laser Melting Additive Manufacturing (SLM) requires a powder particle size of 15-53 μm, which will lead to high production costs and low production efficiency