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A three-dimensional connected tungsten-based composite material and method prepared by laser 3D printing

A 3D printing and composite material technology, which is applied in the field of preparing three-dimensional connected tungsten-based composite materials, can solve the problem of low relative density and achieve the effect of improving mechanical properties

Active Publication Date: 2021-10-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are a large number of tiny cracks in pure tungsten samples prepared by laser 3D printing technology, and the relative density is low; while the preparation of tungsten alloys often uses the melting of the second phase alloy as the bonding phase, tungsten does not melt, and still exists in the form of particles. In alloys, the high strength and high melting point of tungsten cannot be fully utilized, so it is necessary to make full use of laser 3D printing technology to develop new preparation methods for tungsten and its alloys

Method used

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  • A three-dimensional connected tungsten-based composite material and method prepared by laser 3D printing
  • A three-dimensional connected tungsten-based composite material and method prepared by laser 3D printing

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Experimental program
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Effect test

Embodiment 1

[0022] 1. Select spherical tungsten powder prepared by plasma spheroidization and pure copper powder prepared by gas atomization, the particle size distribution of which is 15-65 μm, and the mass fraction of tungsten powder and copper powder is 70% for tungsten powder and 70% for copper powder. 30% ratio for mechanical mixing;

[0023] 2. Select the laser selective melting technology in the laser 3D printing technology (all the embodiments adopt EOS M1003D printer, no more details), choose a higher laser power of 100W, and avoid a large amount of evaporation of copper while ensuring that all the tungsten is melted, The scanning speed is 800mm / s, and the scanning distance is 0.06mm, and the process parameters are selected for laser melting and forming.

[0024] 3. The surface of the tungsten-copper composite material prepared by selective laser melting is cut and sandblasted.

[0025] 4. The method of the present invention realizes the complete melting of the tungsten phase, a...

Embodiment 2

[0027] 1. Select spherical tungsten powder prepared by spray granulation and copper-tin alloy powder prepared by water atomization, the particle size distribution of which is 15-65 μm. The mass fraction of tungsten powder and copper-tin alloy powder is 80%, copper-tin The mass fraction of the alloy powder is 20% for mechanical mixing;

[0028] 2. Choose the laser selective melting technology in the laser 3D printing technology, choose a higher laser power of 120W, to ensure the complete melting of tungsten while avoiding a large amount of evaporation of copper-tin alloy, the scanning speed is 250mm / s, and the scanning distance is 0.04mm. parameters for laser selective melting.

[0029] 3. The surface of the tungsten-copper-tin composite material prepared by selective laser melting is cut and sandblasted.

[0030] 4. The method of the present invention realizes the complete melting of the tungsten phase, and the relative density of the prepared tungsten-copper-tin composite ma...

Embodiment 3

[0032] 1. The tungsten powder prepared by the selective reduction method and the nickel powder prepared by water atomization have a particle size distribution of 15-65 μm. The mass fraction of tungsten powder and nickel powder is 90% for tungsten powder and 10% for nickel powder. The proportion of mechanical mixing;

[0033] 2. Select the laser selective melting technology in the laser 3D printing technology, choose a higher laser power of 150W, and avoid a large amount of nickel evaporation while ensuring the complete melting of tungsten. The scanning speed is 250mm / s, and the scanning distance is 0.04mm. Laser selective melting and forming.

[0034] 3. Cut the surface of the tungsten-nickel composite material prepared by selective laser melting and perform sandblasting.

[0035] 4. The method of the present invention realizes the complete melting of the tungsten phase, and the prepared tungsten-nickel composite material has a relative density of 99.2% and few pores and crac...

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Abstract

The invention discloses a three-dimensional connected tungsten-based composite material and method prepared by laser 3D printing, belonging to the field of 3D printing of refractory metal composite materials. The method includes the following steps: 1) mechanically mixing tungsten powder and second-phase metal or alloy powder according to a certain ratio; 2) using laser 3D printing technology, selecting a higher laser power and matching with an appropriate scanning rate and scanning distance forming; 3) performing surface treatment on the formed tungsten-based composite material to obtain the final three-dimensional connected tungsten-based composite material. The tungsten-based composite material prepared by the invention has high relative density, few pores and cracks, the tungsten phase in the composite material is a three-dimensional connected structure, and the second phase metal or alloy is enclosed in the three-dimensional connected tungsten phase.

Description

technical field [0001] The invention belongs to the field of 3D printing of refractory metal composite materials, and in particular relates to a method for preparing three-dimensional connected tungsten-based composite materials by using laser 3D printing. Background technique [0002] Tungsten and its alloys have a series of excellent properties such as high melting point, high temperature strength, low vapor pressure, low expansion coefficient, and good corrosion resistance in many media, and are widely used in the fields of weaponry, medical equipment, and communication launch equipment. . However, tungsten has a high melting point, high temperature strength, and difficult smelting and processing. At present, most tungsten and its alloys can only be formed by powder metallurgy. This forming process requires expensive tooling and molds, and the process is complicated and difficult to form parts with complex three-dimensional structures. This limits the expansion of its ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105C22C27/04B33Y10/00
CPCC22C27/04B33Y10/00B22F10/00B22F10/66B22F10/34B22F10/28B22F10/36B22F10/366Y02P10/25
Inventor 谈震周振鲁贺定勇吴旭周正郭星晔王国红王曾洁
Owner BEIJING UNIV OF TECH
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