Material increasing manufacturing method of pure tungsten metal

An additive manufacturing and metal technology, applied in the field of additive manufacturing of pure tungsten metal, can solve the problems of complex spreading/solidification behavior, difficulty in achieving complete densification, and no breakthrough in pure tungsten additive molding processes and methods. Improve molding density and component performance, and solve the effect of unstable droplet state

Active Publication Date: 2015-09-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Compared with tungsten alloys, the forming of pure tungsten must be based on a complete melting / solidification process. Due to the high melting point and thermal conductivity of tungsten, the spreading / solidification behavior of molten droplets under the action of a heat source is more complicated, and it is difficult to achieve complete densification. Therefore, pure tungsten Tungsten additive molding process and method has not been a breakthrough

Method used

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  • Material increasing manufacturing method of pure tungsten metal
  • Material increasing manufacturing method of pure tungsten metal
  • Material increasing manufacturing method of pure tungsten metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1) Screening and proportioning of tungsten powder particles

[0062] Take the spherical pure tungsten powder particles without impurities and oxygen adsorption on the surface, and screen out large particles of tungsten powder and small particles of tungsten powder. The maximum particle size is 2.1 μm, and the particle size ratio of small tungsten powder particles to large tungsten powder particles is 0.11.

[0063] Mix small tungsten powder particles with large tungsten powder particles to obtain a mixed powder. The mass of large tungsten powder particles accounts for 70% of the mass of the mixed powder, and the mass of small tungsten powder particles accounts for 30% of the mass of the mixed powder. , The bulk density of the mixed powder is 53%.

[0064] Add La and carbon black in mixed powder, the quality that adds La is 0.3% of mixed powder quality, the quality that adds carbon black is 0.3% of mixed powder quality,

[0065] 2) Laser forming and remelting

[0066]...

Embodiment 2

[0076] 1) Screening and proportioning of tungsten powder particles

[0077] Take the spherical pure tungsten powder particles without impurities and oxygen adsorption on the surface, and screen out large particles of tungsten powder and small particles of tungsten powder. The maximum particle size is 2.1 μm, and the particle size ratio of small tungsten powder particles to large tungsten powder particles is 0.11.

[0078] Mix small tungsten powder particles with large tungsten powder particles to obtain a mixed powder. The mass of large tungsten powder particles accounts for 70% of the mass of the mixed powder, and the mass of small tungsten powder particles accounts for 30% of the mass of the mixed powder. , The bulk density of the mixed powder is 53%.

[0079] Add La and carbon black in mixed powder, the quality that adds La is 0.3% of mixed powder quality, the quality that adds carbon black is 0.3% of mixed powder quality,

[0080] 2) Laser forming and remelting

[0081]...

Embodiment 3

[0091] 1) Screening and proportioning of tungsten powder particles

[0092] Take the spherical pure tungsten powder particles without impurities and oxygen adsorption on the surface, and screen out large particles of tungsten powder and small particles of tungsten powder. The maximum particle size is 2.1 μm, and the particle size ratio of small tungsten powder particles to large tungsten powder particles is 0.11.

[0093] Mix small tungsten powder particles with large tungsten powder particles to obtain a mixed powder. The mass of large tungsten powder particles accounts for 70% of the mass of the mixed powder, and the mass of small tungsten powder particles accounts for 30% of the mass of the mixed powder. , The bulk density of the mixed powder is 53%.

[0094] Add La and carbon black in mixed powder, the quality that adds La is 0.3% of mixed powder quality, the quality that adds carbon black is 0.3% of mixed powder quality,

[0095] 2) Laser forming and remelting

[0096]...

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Abstract

The invention relates to a material increasing manufacturing method of pure tungsten metal. The manufacturing method comprises steps of taking ball-shaped pure tungsten powder particles; screening out and mixing tungsten powder small particles and tungsten powder big particles to obtain mixed powder bodies; installing a metal substrate on an optical fiber laser work bench; filling a powder body stock bin with the mixed powder bodies and sealing a shaping cavity body; using a vacuum pump to pump the interior of the shaping cavity body to be in vacuum degree of -90Kpa; inputting protection gas into the shaping cavity body; repeating vacuumization and protection gas inputting so as to allow the oxygen content in the shaping cavity body to be reduced to less than 300ppm; scanning the sacrificing area of the metal substrate with laser until the oxygen content is reduced to less than 50ppm; sending the mixed powder bodies in the powder body stock bin to the metal substrate by a powder laying machine; using a powder laying scraper to lay the powder bodies so as to obtain a mixed powder body thin layer; fusing the mixed powder bodies in a shaping slicing area via high-energy laser beams; refusing the mixed powder bodies after each layer is shaped; after the refusing is finished, reducing the work bench by one slice thickness; and repeating the laser shaping and refusing until the whole part is finally shaped.

Description

technical field [0001] The invention relates to a method for additive manufacturing of pure tungsten metal, belonging to the field of additive manufacturing. Background technique [0002] Pure tungsten is a refractory metal with high melting point, high density, high temperature strength and high hardness. It is widely used in aerospace, defense weapons, fusion energy and other fields. However, due to the high melting point and poor formability of metal tungsten, it can only be processed by melting casting, powder metallurgy, injection molding, and plasma spraying molding. parts. [0003] Additive manufacturing is a new type of processing technology, which is different from traditional "removal" manufacturing. It does not require original embryos and molds. It directly forms objects of any complex shape by adding materials layer by layer based on the computer 3D model data of the part. Research on additive manufacturing of materials such as titanium alloys, stainless steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
Inventor 周鑫沈志坚刘伟马静王殿政
Owner TSINGHUA UNIV
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