Recovery processing method for waste Ti or Ti alloy powder in additive manufacturing

A technology of additive manufacturing and recycling, which is applied in the direction of additive processing, etc., and can solve the problems of no mature recycling and reuse treatment methods for additive manufacturing waste powder, mass loss of titanium or titanium alloy powder, and powder no longer having a spherical shape etc. to achieve the effects of reducing raw material consumption, improving surface finish, and improving powder utilization

Active Publication Date: 2020-01-10
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0005] However, although these powder processing methods, such as ball milling or gas agitation, can improve the hollow defects of the powder, they will inevitably lead to changes in the macroscopic shape of the powder such as collapse and cracking, so that the powder no longer has a spherical shape, which is not conducive to the reuse of the powder ; The gas stirring treatment reduces the fine satellite powder attached to the surface of the powder material without changing the macroscopic shape of the powder, but it cannot achieve the reduction of the powder impurity content, especially the oxygen content; the ultrasonic pickling method treats the titanium powder, although The surface morphology and composition of the powder can be improved at the same time, but due to the huge specific surface area of ​​the powder, it will make the reaction process difficult to control, and the treated titanium or titaniu...

Method used

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  • Recovery processing method for waste Ti or Ti alloy powder in additive manufacturing
  • Recovery processing method for waste Ti or Ti alloy powder in additive manufacturing
  • Recovery processing method for waste Ti or Ti alloy powder in additive manufacturing

Examples

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Embodiment 1

[0040] The method for recovering waste Ti-6Al-4V titanium alloy powder with an oxygen content of 1900ppm after the EBM additive manufacturing process has been recycled 17 times, the steps of the method are as follows: under inert gas protection conditions, waste titanium or titanium alloy powder is carried out as follows operate:

[0041] Step (1), take 1L of waste titanium alloy powder after Ti-6Al-4V titanium alloy additive manufacturing and recycling 17 times, its oxygen content is 1900ppm, the particle size range of the powder is 100μm~150μm, and the sodium content of 0.5 % sodium amalgam 0.5L to prepare a mixed slurry with a mixture viscosity of 14Pa·s;

[0042] In step (2), use a three-dimensional mixer to add sodium amalgam into the additive manufacturing waste Ti-6Al-4V titanium alloy powder for mixing operation, so that the mixed slurry reaches a fluidized state. During the mixing operation, the filling factor is 0.5 , the mixing speed is 110r / min, the mixing tempera...

Embodiment 2

[0048] The recovery and reuse method of the waste pure titanium powder with an oxygen content of 2100ppm after the pure titanium SLM process is recycled 29 times, the steps of the method are as follows: under inert gas protection conditions, the waste titanium or titanium alloy powder is carried out as follows:

[0049] Step (1), take 0.8L of waste pure titanium powder after recycling 29 times in pure titanium additive manufacturing, its oxygen content is 2100ppm, and the particle size range of the powder is 30 μm to 100 μm, and sodium mercury with a sodium content of 0.4% is added to the powder Prepare 0.5L to prepare a mixed slurry with a mixture viscosity of 13Pa·s;

[0050] In step (2), use the V-shaped mixer to add sodium amalgam into the additively manufactured waste pure titanium powder for mixing operation, so that the mixed slurry reaches a fluidized state. During the mixing operation, the filling coefficient is 0.6, and the mixing speed is The mixing temperature is 9...

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Abstract

The invention relates to a recovery processing method for waste Ti or Ti alloy powder in additive manufacturing. Under inert gas shielding and an indoor temperature condition of 10-20 DEG C, the wasteTi or Ti alloy powder is processed by the steps that (1) sodium amalgam is added into the waste Ti or Ti alloy powder in additive manufacturing, so a mixed sizing agent is obtained; (2) the mixed sizing agent obtained at the step (1) is mixed, so the mixed sizing agent can reach a fluidized state; (3) an inert gas is fed into the mixed sizing agent in the fluidized state, shear friction is motivated to generate the Ti or Ti alloy powder and evaporation of sodium amalgam in the sizing agent is accelerated through convection effects between bubbles generated in the mixed sizing agent and the sizing agent, so solid Ti or Ti alloy powder is obtained through separation; and (4) the Ti or Ti alloy powder obtained at the step (3) is cleaned and dried, so the Ti or Ti alloy powder which can be reused in additive manufacturing is obtained.

Description

technical field [0001] The invention belongs to the technical field of metal powder waste treatment, and in particular relates to a method for recycling and treating waste titanium or titanium alloy powder in additive manufacturing. Background technique [0002] Metal additive manufacturing is a manufacturing technology that uses laser or electron beam as a heat source, and uses preset or synchronously supplied metal powder as a material to accumulate layer by layer on a substrate to form metal parts. Titanium and titanium alloys are the most widely used powders in the field of additive manufacturing. During the additive manufacturing process, titanium or titanium alloy powder that is not directly heated by the heat source will remain in the powder bed and continue to be used as a raw material. However, after repeated use of titanium or titanium alloy powder in the powder bed, the sphericity will decrease, sintering and bonding, the surface will become rough, and the conten...

Claims

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Application Information

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IPC IPC(8): B22F9/04B33Y40/00
CPCB22F9/04B33Y40/00B22F2009/042
Inventor 刘金涛欧东斌陈海群朱兴营周法
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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