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3D-printing metal powder material preparation method capable of reducing hollow powder

A 3D printing and metal powder technology, applied in the field of 3D printing, can solve the problems of low density of parts, warping of parts, low bonding strength of sintered area, etc., achieve high powder sphericity, reduce shrinkage cavity, and low oxygen content Effect

Inactive Publication Date: 2017-05-31
NANTONG JINYUAN INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of hollow powder will lead to many defects in metal 3D printing parts, such as low density of parts, low bonding strength of sintered area, warping and deformation of parts, etc.

Method used

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  • 3D-printing metal powder material preparation method capable of reducing hollow powder
  • 3D-printing metal powder material preparation method capable of reducing hollow powder

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Effect test

preparation example Construction

[0017] A method for preparing a metal powder material for 3D printing for reducing hollow powder, comprising the following steps:

[0018] A. The raw material stainless steel or aluminum alloy is melted under the protection of slightly positive pressure nitrogen, and melted into stainless steel or aluminum alloy liquid;

[0019] B. Use nitrogen as the atomizing gas, control the atomization pressure to 1.5-2Mpa when aluminum alloy is used as raw material, and control the atomization pressure to 3-4Mpa when stainless steel is used as raw material, and carry out gas atomization on molten stainless steel or aluminum alloy liquid , the liquid is crushed and cooled into spherical or quasi-spherical particles of stainless steel or aluminum alloy;

[0020] C. The spherical or quasi-spherical particles obtained in the collecting step B are processed to obtain metal powder for 3D printing.

[0021] In the preparation method of the metal powder material for 3D printing used to reduce th...

Embodiment 1

[0024] Embodiment 1, a kind of preparation method for the 3D printing metal powder material that is used to reduce hollow powder, comprises the following steps:

[0025] A. The raw material stainless steel or aluminum alloy is melted under the protection of slightly positive pressure nitrogen, and melted into stainless steel or aluminum alloy liquid;

[0026] Specifically: the raw material stainless steel (316L stainless steel) is placed in a closed melting furnace body, the atomization chamber and the melting furnace body are evacuated and filled with nitrogen to form a slight positive pressure state, the power of the melting furnace body and the holding furnace is adjusted to 90kw, The holding time is 30 minutes, and the melting furnace body is heated to a preset temperature of 1650° C., so that the raw stainless steel in the melting furnace body melts into stainless steel liquid.

[0027] B. Nitrogen is used as the atomizing gas, the atomizing pressure is controlled to 3Mpa...

Embodiment 2

[0030] Embodiment 2, a kind of preparation method for the 3D printing metal powder material that is used to reduce hollow powder, comprises the following steps:

[0031] A. The raw material stainless steel is smelted under the protection of slight positive pressure nitrogen, and smelted into stainless steel liquid;

[0032] Specifically: put the raw material stainless steel (304 stainless steel) in a closed smelting furnace, vacuumize the atomization chamber and smelting furnace and fill it with nitrogen to form a slight positive pressure state, adjust the power of the smelting furnace and the holding furnace to 80kw, The holding time is 50 minutes, and the melting furnace body is heated to a preset temperature of 1650° C., so that the raw stainless steel in the melting furnace body is melted into stainless steel liquid.

[0033] B. Nitrogen is used as the atomizing gas, and the atomizing pressure is controlled to be 3.5Mpa, and the molten stainless steel is gas-atomized, and ...

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Abstract

The invention discloses a 3D-printing metal powder material preparation method capable of reducing hollow powder. The 3D-printing metal powder material preparation method includes A, melting stainless steel or aluminum alloy under protection of micro-positive pressure nitrogen into stainless steel or aluminum alloy liquid; B, taking nitrogen as an atomizing gas, controlling the atomizing pressure as 1.5-2MPa when the aluminum alloy serves as a raw material, controlling the atomizing pressure as 3-4MPa when the stainless steel serves as the raw material, and atomizing the melted stainless steel or aluminum alloy liquid to crush and cool the liquid into spherical or near-spherical stainless steel or aluminum alloy particles; C, collecting the spherical or near-spherical particles obtained in the step B, and treating the spherical or near-spherical particles to obtain 3D-printing metal powder. By the 3D-printing metal powder material preparation method, quantity of the hollow powder is reduced greatly, and 3D printing quality and mechanical property are improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a method for preparing metal powder for 3D printing, in particular to a method for preparing a metal powder material for 3D printing used to reduce hollow powder. Background technique [0002] Emerging 3D printing technology has attracted more and more people's attention, and its application fields are very wide, including: aerospace, mold, medical, fashion, culture, creative design, construction and many other industries. With the rapid development of science and technology, the standards of the manufacturing industry are getting higher and higher, and the requirements for the accuracy of parts are more refined. In the field of aerospace, the requirements for the accuracy of parts are particularly obvious. High precision requirements require operators to have rich experience and high operating standards, especially some parts contain some internal flow pipes. In the traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B33Y70/00
CPCB22F9/082B22F2009/0844B33Y70/00
Inventor 岳巍盛洪超薛高健邓斌姜勇梁廷禹杨海峰
Owner NANTONG JINYUAN INTELLIGENT TECH CO LTD
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