Powder for additive manufacturing and preparation method and application thereof

A technology of additive manufacturing and powder, which is applied in the field of powder for additive manufacturing and its preparation, and can solve problems affecting the formability and mechanical properties of materials, thermal cracks of aluminum alloy parts, etc.

Pending Publication Date: 2022-05-27
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that the aluminum alloy parts obtained by the existing additive manufacturing are prone to hot crack defects, which affect the

Method used

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  • Powder for additive manufacturing and preparation method and application thereof
  • Powder for additive manufacturing and preparation method and application thereof
  • Powder for additive manufacturing and preparation method and application thereof

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preparation example Construction

[0046] Another embodiment of the present invention provides the above-mentioned preparation method of powder for additive manufacturing, comprising the following operation steps:

[0047] The aluminum alloy powder and the nanometer Ni powder are fully mixed, so that the nanometer Ni powder is uniformly attached to the surface of the aluminum alloy powder, and the powder for additive manufacturing is obtained;

[0048] After thorough mixing, the powders for additive manufacturing are dried under vacuum.

[0049] Another embodiment of the present invention provides the application of the powder for additive manufacturing as described above in the additive manufacturing of aluminum alloys.

[0050] In some embodiments, the method of additive manufacturing is laser additive manufacturing.

[0051] In some embodiments, the application of the additively manufactured aluminum alloy includes the following steps:

[0052] Put the powder for additive manufacturing into the selective l...

Embodiment 1

[0055] This embodiment is used to illustrate the additively manufactured aluminum alloy disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0056] (1) The nanometer Ni powder with a mass fraction of 3.5% and an average particle size of about 50 nm and 7075 aluminum alloy powder with a mass fraction of 96.5% and an average particle size of about 30 μm were quickly turned in a three-dimensional rocking powder mixer. Invert and shake for 3 hours to mix well.

[0057] (2) Put the mixed powder obtained in step (1) into a vacuum drying oven, and place it at 70° C. for 12 hours for drying.

[0058] (3) Put the dried powder into the selective laser melting equipment, and shape it with a laser power of 240W, a scanning rate of 80 mm / s, a scanning distance of 100 μm, and a layer thickness of 30 μm to obtain an aluminum alloy.

Embodiment 2

[0060] This embodiment is used to illustrate the additively manufactured aluminum alloy disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0061] (1) The nanometer Ni powder with a mass fraction of 5.8% and an average particle size of about 760 nm and 7075 aluminum alloy powder with a mass fraction of 94.2% and an average particle size of about 30 μm were quickly turned in a three-dimensional rocking powder mixer. Invert and shake for 3 hours to mix well.

[0062] (2) Put the mixed powder obtained in step (1) into a vacuum drying oven, and place it at 70° C. for 12 hours for drying.

[0063] (3) Put the dried powder into the selective laser melting equipment, and shape it with a laser power of 240W, a scanning rate of 60mm / s, a scanning distance of 100μm, and a layer thickness of 30μm to obtain an aluminum alloy.

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Abstract

In order to solve the problems that an aluminum alloy part obtained through existing additive manufacturing is prone to having the hot crack defect, and the material formability and the mechanical property are affected, the powder for additive manufacturing is provided and comprises, by weight, 92-98 parts of aluminum alloy powder and 2-8 parts of nano Ni powder. Wherein the average particle size of the aluminum alloy powder is 1-100 microns, and the average particle size of the nano Ni powder is 10-800 nanometers. Meanwhile, the invention further discloses a preparation method and application of the powder for additive manufacturing. According to the powder for additive manufacturing, the laser input efficiency is improved, meanwhile, hot cracks of an aluminum alloy part obtained through additive manufacturing are effectively reduced, and the mechanical property of the aluminum alloy part is improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing materials, and in particular relates to a powder for additive manufacturing and a preparation method and application thereof. Background technique [0002] Due to its high specific strength, low density, high hardness, and good machinability, aluminum alloys can be used as light and high-strength structural materials, and are often used in the manufacture of various light and high-load parts and structural parts. They are widely used in automobiles, ships, aerospace and aviation. civil and military fields. However, due to the wide range of solidification temperature, aluminum alloys are prone to thermal crack defects due to large thermal stress in the process of high-energy beam-based 3D printing (additive manufacturing), which drastically reduces the formability and mechanical properties of the material. . SUMMARY OF THE INVENTION [0003] Aiming at the problem that the aluminu...

Claims

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Application Information

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IPC IPC(8): B22F1/07B22F1/052C22C21/00B22F1/17B22F10/28B33Y10/00B33Y70/00
CPCC22C21/00B22F10/28B33Y10/00B33Y70/00Y02P10/25
Inventor 李干朱强阮刚黎兴刚郭川黄禹赫程乐温林举
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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