A combined atomization device and method for preparing spherical metal alloy micropowder

Abstract

The invention relates to a combined atomization type device and method for preparing spherical metal alloy micro powder. The device comprises an induction melting furnace, a tundish, an inert gas pipe for atomization, a gas atomization spray ring, a centrifugal atomization rotating disc, a high-speed motor, a motor protection shell, an atomization chamber shell, a fixed support and a melting operation bin shell. According to the combined atomization type device and method for preparing the spherical metal alloy micro powder, powder prepared through gas atomization and powder prepared through centrifugal atomization are combined to be used together, so that the pressure of gas for gas atomization and the rotating speed of the centrifugal atomization rotating disc are decreased, the operation difficulty in the manufacturing and production processes of the device is substantially lowered, mass production is achieved, and the prepared metal alloy micro powder meets the specification and requirements of 3D printing for the metal alloy micro powder; and particularly, the method provided by the invention has the advantages that a metal alloy micro powder product is narrow in particle size distribution and good in controllability, the degree of sphericity is significantly improved, the oxygen content is substantially reduced, and meanwhile, the equipment investment and production operation cost are reduced.

Description

Technical field [0001] The present invention belongs to the technical field of 3D printing, and relates to a device and method for preparing spherical metal alloy powder by combined atomization, and in particular to a device and method for producing metal alloy spherical powder for 3D printing. Background technique [0002] 3D printing (additive manufacturing) technology, especially the 3D printing technology of complex metal components, has become one of the most emerging technologies in the world. Compared with the traditional machining process, 3D printing technology is not limited by the geometric shape of the parts, reduces the expensive cost, shortens the development time, low labor cost, does not require pre-processing and post-processing processes, making it a very useful Potential technology. In order to obtain high-quality metal alloy forming parts, in addition to important conditions such as process, equipment and software, metal alloy powder materials are a key facto...

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Problems solved by technology

Plasma method RF plasma gun fire high-energy plasma gun as a heat source, the required equipment is complex, the raw material requirements are high, the cost is high, and it is difficult to meet the production requirements of mass production of 3D printing metal powder

Due to the fast cooling speed of the water atomization method, there are disadvantages that the shape of the micropowder is irregular, the sphericity is not good, and the oxygen content in the product is too high.

Although the sphericity of the product produced by the inert gas atomization method is greatly improved, and the yield of fine powder is high, satellite droplets are prone to appear on the surface of the product micropowder, resulting in a decrease in its fluidity and spreadability, and it is necessary to select the sphericity of the product. Due to the finer particles, the difficulty of sphericity screening is increased; at the same time, the separate gas atomization operation requires a high pressure of inert gas, as high as 5.0MPa, or even above 10.0MPa

High-speed centrifugal atomization is a method of metal alloy micropowder developed in the past two years. In order to obtain spherical micropowder for 3D printing, the rotational speed of the centrifugal disc is required to be as high as 20,000 rpm, and there are problems with the dynamic balance of the turntable and the difficulty of equipment manufacturing. question

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