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High performance magnesium matrix composite based on laser 3D printing forming and preparation method thereof

A technology of 3D printing and composite materials, which is applied in the field of high-performance magnesium-based composite materials and its preparation, and can solve problems affecting powder spreading performance, high saturated vapor pressure, and affecting powder spreading, etc.

Active Publication Date: 2018-05-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of pure Mg is only 1107°C, and it is very easy to form Mg vapor in high-energy-density laser processing, which will lead to a decrease in the compactness of the final product and a loss of Mg components, which will significantly affect the formability of magnesium alloys
[0006] (2) Mg alloy is extremely prone to "oxidation reaction"
The oxidized Mg alloy powder affects the powder spreading performance and energy absorption, and the oxidized Mg alloy melt significantly reduces the wettability of the current scanning pass and the adjacent solidified metal. At the same time, under the disturbance of the laser, the oxidized impurities are very It may enter the molten pool and form holes in the solidified matrix, thereby reducing the density and mechanical properties of the sample
[0007] (3) From the perspective of forming process, Mg alloy material has low density and poor powder fluidity, so its spreadability and powder transmission performance on the powder bed are poor, resulting in uneven powder layer laying in the SLS / SLM process and LMD process Discontinuous and uniform powder spraying
When the high-energy laser beam interacts with the uneven powder layer or discontinuously conveyed powder, it will cause serious powder / melt splashing and melt "spheroidization" effect, which will affect the subsequent powder spreading, resulting in the failure of the additive manufacturing process. conduct
[0008] The two most prominent problems are the first two points, that is, the high saturated vapor pressure and the characteristics of easy oxidation, which seriously restrict the forming and mechanical properties of laser additive manufacturing magnesium alloy components.

Method used

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  • High performance magnesium matrix composite based on laser 3D printing forming and preparation method thereof
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  • High performance magnesium matrix composite based on laser 3D printing forming and preparation method thereof

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Embodiment 1

[0053] The present invention is a high-performance magnesium-based composite material based on laser 3D printing and its preparation method. The preparation process of the magnesium-based composite material includes two stages of mechanical ball milling and powder mixing and laser 3D printing forming and curing:

[0054] (i) Mechanical ball milling: Weigh 2wt.% elemental silicon particles (average particle size of 3 microns) and magnesium matrix powder (average particle size of 20 microns) for proportioning, and place them in a ball mill for mechanical high-energy ball milling. Before the ball milling, the ball mill tank was continuously evacuated and the residual air was exhausted with argon, and then hydrogen gas was introduced into the tank, and the air pressure was controlled at 0.5 Mpa. The ball milling time is set to 8h, the ball milling speed is 250r / min, the ball-to-material ratio in the ball milling process is 8:1, every 15 minutes of ball milling, cooling for 10 minut...

Embodiment 2

[0059] The present invention is a magnesium-based composite material formed based on laser 3D printing. The preparation process of the magnesium-based composite material includes two stages of mechanical ball milling and powder mixing and laser 3D printing forming and curing:

[0060] (i) Mechanical ball milling: Weigh 4wt.% elemental silicon particles (average particle size 5 microns) and magnesium matrix powder (average particle size 30 microns) for proportioning, and place them in a ball mill for mechanical high-energy ball milling. Before the ball milling, the ball mill tank was continuously evacuated and the residual air was exhausted with argon, and then hydrogen gas was introduced into the tank, and the air pressure was controlled at 0.5 Mpa. The ball milling time is set to 10h, the ball milling speed is 300r / min, the ball to material ratio in the ball milling process is 8:1, every 15 minutes of ball milling, cooling for 10 minutes. Weigh 1.5wt.% calcium hydride powder ...

Embodiment 3

[0065] The present invention is a magnesium-based composite material formed based on laser 3D printing. The preparation process of the magnesium-based composite material includes two stages of mechanical ball milling and powder mixing and laser 3D printing forming and curing:

[0066] (i) Mixing powder by mechanical ball milling: weigh 5wt.% elemental silicon particles (average particle size of 6 microns) and magnesium matrix powder (average particle size of 15 microns) for proportioning, and place them in a ball mill for mechanical high-energy ball milling. Before the ball milling, the ball mill tank was continuously evacuated and the residual air was exhausted with argon, and then hydrogen gas was introduced into the tank, and the air pressure was controlled at 0.5 Mpa. The ball milling time is set to 5h, the ball milling speed is 350r / min, the ball-to-material ratio in the ball milling process is 8:1, every 15 minutes of ball milling, cooling for 10 minutes. Weigh 2wt.% cal...

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Abstract

The invention relates to the field of magnesium matrix composites, in particular to a high performance magnesium matrix composite based on laser 3D printing forming and a preparation method thereof. The high performance magnesium matrix composite comprises, by weight, 2-5% of monatomic silicon particles, 6-8% of LiH, 1-2% of CaH, and the balance high-purity magnesium powder. The problem of the evaporation and oxidation of magnesium alloy powder in the forming process can be effectively reduced, so as to ensure a precision forming manufacture of high performance magnesium alloy, and also a method for the preparation of magnesium alloy powder specially for laser additive manufacturing is provided.

Description

technical field [0001] The invention belongs to the field of magnesium-based composite materials, and specifically relates to a high-performance magnesium-based composite material based on laser 3D printing and a preparation method thereof. technical background [0002] Magnesium alloy is currently one of the lightest metal structural materials in industrial applications. It has high specific strength, specific stiffness, and good casting, shock absorption, cutting and dimensional stability. It has already attracted attention in the aviation industry and the automobile industry. attention. In addition, magnesium alloys have broad application prospects in the biomedical field due to their inherent biocompatibility, biodegradability, low elastic modulus, and excellent mechanical properties. However, given the hexagonal crystal structure of magnesium alloys, the formability of magnesium alloys is severely limited, especially for biomedical implants with complex and fine struct...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C32/00C22C1/04C22C1/10B33Y70/00
CPCB33Y70/00C22C1/0408C22C1/1084C22C23/00C22C32/0089
Inventor 顾冬冬马成龙戴冬华夏木建陈洪宇赵轩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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