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Method for preparing titanium and titanium alloy powder for 3D printing on basis of fluidized bed jet milling technology

A 3D printing and fluidized bed technology, applied in powder suspension granulation, additive manufacturing, metal processing equipment, etc., can solve the problem of low cost and stable production of spherical titanium powder, low yield of fine particle size titanium powder, Facing the high cost of milling equipment and other issues, it achieves the effects of cost reduction, high production efficiency and good fluidity

Active Publication Date: 2019-06-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fine particle size (<45μm) spherical titanium powder prepared by the above technology is extremely expensive, all higher than 2000 yuan / kg
The main reasons are: the yield of fine particle size titanium powder is generally low, and the cost of powder making equipment is high
Moreover, after decades of development of the above-mentioned preparation technology, the yield of fine powder is close to the limit, and it is difficult to realize the low-cost and stable production of spherical titanium powder, which has become the primary problem restricting the development of the global 3D printing titanium industry.

Method used

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  • Method for preparing titanium and titanium alloy powder for 3D printing on basis of fluidized bed jet milling technology
  • Method for preparing titanium and titanium alloy powder for 3D printing on basis of fluidized bed jet milling technology

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Effect test

Embodiment 1

[0019] When using the titanium powder of the present invention, the hydrogenated dehydrogenation titanium powder of the irregular shape used has an oxygen content of 1200PPM, a quality of 400g, a particle size below 325 mesh, and an included angle between the fluidized bed jet mill nozzle and the grinding chamber wall surface of 60°. Use high-purity nitrogen as the grinding gas, the pressure of the grinding gas is 0.6MPa, the frequency of the sorting wheel is 60Hz / min when feeding, 0 when discharging, and the grinding time is 6min, such as figure 1 As shown, the morphology of the titanium powder before treatment is irregular, and the titanium powder after jet milling is nearly spherical, such as figure 2 As shown, the sphericity is improved, the surface smoothness is higher, the fluidity is 35s / 50g, and the oxygen content is 1400PPM.

[0020] The whole process of the present invention is time-consuming and requires low equipment. Only by adjusting the gas flow rate and grindi...

Embodiment 2

[0022] In this embodiment, the irregular hydrogenated dehydrogenation titanium powder described in the above-mentioned embodiment 1 is used, the oxygen content is 1200PPM, the mass is 600g, and the particle size is 325 mesh. The angle between the nozzle of the fluidized bed jet mill and the wall of the grinding chamber is 60°. Nitrogen is used as the grinding gas. The pressure of the grinding gas is 0.6MPa. The time is 4 minutes, the obtained titanium powder is nearly spherical, the surface is relatively smooth, the fluidity is 41s / 50g, and the oxygen content is 1600PPM.

Embodiment 3

[0024] This embodiment adopts the hydrogenated dehydrogenation titanium powder described in the above embodiment 1, the oxygen content is 1200PPM, the mass is 600g, and the particle size is 200 mesh. The angle between the nozzle of the fluidized bed jet mill and the wall of the grinding chamber is 60°, nitrogen is used as the grinding gas, the pressure of the grinding gas is 0.45 MPa, the frequency of the sorting wheel is 50 Hz / min, and the grinding time is 6 min. The obtained titanium powder is nearly spherical, The fluidity is 33s / 50g, and the oxygen content is 1600PPM.

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Abstract

The invention discloses a method for preparing titanium and titanium alloy powder for 3D printing on the basis of a fluidized bed jet milling technology, and belongs to the field of powder preparationand modification. According to the method, hydrogenated dehydrogenation titanium powder and titanium alloy powder are adopted as main raw material powder, jet milling and shaping are carried out under the protective atmosphere of nitrogen or argon, and finally the high-performance titanium and titanium alloy powder meeting the 3D printing technology is obtained. Compared with the prior art, the method has the advantages of being high in production efficiency, low in production cost and the like. The prepared titanium and titanium alloy powder also has the advantages of being narrow in particle size distribution, close to the spherical shape, controllable in oxygen content, good in liquidity, high in purity and the like, therefore, the industrial production technical requirements of 3D printing, injection molding, thermal spraying and the like can be met.

Description

technical field [0001] The invention belongs to the technical field of metal powder metallurgy preparation, and relates to a jet mill shaping preparation technology of low-cost titanium and titanium alloy powders for 3D printing. Background technique [0002] Metal titanium has the advantages of low density, excellent corrosion resistance, high specific strength, and excellent biocompatibility, and is widely used in high-tech fields such as aerospace, biomedical, petrochemical, and energy power. At present, the preparation of titanium products with high performance and complex shapes by powder metallurgy near-net shape processes such as 3D printing and injection molding has attracted great attention at home and abroad. In view of the needs of process characteristics, the powder required for 3D printing technology should have the characteristics of good fluidity, low oxygen content, and high loose ratio. Among them, the good fluidity of the powder is the key factor to ensure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00B33Y70/00B22F1/052
CPCB22F9/04B02C19/06C22C1/0458B22F2009/044B22F2999/00B33Y70/00Y02P10/25B22F1/052B22F2202/15B22F2201/02B22F2201/11B22F10/10B22F10/20B22F3/225B01J2/16B22F2301/205
Inventor 陈刚秦明礼陶麒鹦曲选辉
Owner UNIV OF SCI & TECH BEIJING
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