Method for preparing spherical powder material used for three-dimensional printing

Abstract

The invention discloses a method for preparing a spherical powder material used for three-dimensional printing. The method includes the steps of raw material selecting, high-energy ball milling and radio-frequency plasma spherizing. Selected raw materials are metal or alloy powder in the step of raw material selecting; the step of high-energy ball milling is carried out under the argon shielding condition, petroleum ether serves as the ball milling medium, and the metal or alloy powder is aluminum alloy powder, or titanium alloy powder, or nickel-base alloy powder, or stainless steel powder or tungsten alloy powder; according to the step of radio-frequency plasma spherizing, the total gas flow is 100 L / min-200 L / min, the input power of plasma is 50 kW-100 kW, the negative pressure of a gas outlet of a system is minus 1000 Pa-minus 2000 Pa, and the powder conveying amount is 50 g / min-150 g / min. The manufactured spherical powder is high in sphericity degree, even in granularity, low in oxygen content and good in liquidity, has few defects and is suitable for three-dimensional printing. The method for preparing the spherical powder material used for three-dimensional printing has the advantage that the process is accurate and controllable.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional manufacturing, and relates to a method for manufacturing three-dimensional printing consumables, in particular to a method for preparing spherical powder materials for three-dimensional printing. Background technique [0002] Three-dimensional printing, also known as 3D printing, is one of the most concerned emerging technologies in the world. It was selected as one of the ten most breakthrough technological innovations in 2014 by MIT's "Technology Review" magazine. As a strategic emerging industry, 3D printing technology and related industries are developing rapidly. McKinsey predicts that by 2025, the scale of 3D printing related industries is expected to reach 0.2 trillion to 0.6 trillion US dollars. [0003] 3D printing powder materials are the key to restricting the promotion and application of 3D printing technology. At present, the methods for preparing 3D printing powder material...

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Problems solved by technology

[0003] 3D printing powder materials are the key to restricting the promotion and application of 3D printing technology. At present, the methods for preparing 3D printing powder materials mainly include mechanical grinding method, self-propagating high-temperature synthesis method, atomization method, rotating electrode method, chemical vapor deposition method; mechanical grinding method The process is simple and the cost is low, but the efficiency and purity are low, so it is difficult to be used in industrial production; although the self-propagating high-temperature synthesis method has a simple process and is easy to obtain fine powder, but the oxygen content is high and the shape is irregular, such as adding microalloying elements , the reaction is particularly difficult to fully, and the uniformity of the powder composition is poor; the atomization method is mainly used for the preparation of metal or alloy powder, for some fusible oxide ceramic materials, it is difficult to obtain fine ceramic powder, and the purity cannot be guaranteed due to the presence of crucible pollution ; The rotating electrode method can prepare high-purity metal powder, but the prepared powder is relatively coarse, and the average particle size is generally above 100-150 μm; the particle size of the powder prepared by the chemical vapor deposition method is uniform, but the post-treatment process of the powder is complicated, and the production energy consumption higher

[0004] At present, domestic high-end 3D printing powder materials mainly rely on imports, while foreign manufacturers often bundle raw materials and equipment for high sales (the price is about 5 to 10 times the price of domestic 3D printing powder materials), which greatly restricts my country's 3D printing technology development of

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