Composite green body and method for additive manufacturing of metal parts by using composite green body

A composite green body and additive manufacturing technology, which is applied in the field of composite green bodies and the use of composite green bodies for additive manufacturing of metal parts, and can solve problems such as intractable asymmetric deformations.

Active Publication Date: 2019-08-16
长沙墨科瑞网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because of the asymmetric shrinkage, there will be more difficult asymmetric deformation problems
To sum up, the biggest problem currently existing in "indirect metal 3D printing technology" is: the subsequent sintering of the "modeling green body" will produce a large proportion of shrinkage and asymmetric deformation
[0006] In the present invention, a "composite green body" is 3D printed at room temperature first, and then the "composite green body" is sintered into a composite metal part with almost no shrinkage deformation by vacuum brazing and sintering; such a manufacturing method, in additive manufacturing In the field of metal parts, there is no public report yet

Method used

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  • Composite green body and method for additive manufacturing of metal parts by using composite green body
  • Composite green body and method for additive manufacturing of metal parts by using composite green body
  • Composite green body and method for additive manufacturing of metal parts by using composite green body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Task: Print a 316L moiré stainless steel open cup;

[0068] Step S1:

[0069] Mix 9000g of gas-atomized 304 stainless steel powder with a particle size of 10 μm to 53 μm and 1000g of HJbinder-1318 water-based binder in a double planetary vacuum mixer to obtain 10000g of stainless steel base material alloy slurry.

[0070] Mix 8800g of vacuum atomized nickel-based solder alloy BNi-7 (BNi76CrP) powder with a particle size of 0.5 μm to 75 μm and 1200 g of HJbinder-1318 water-based binder in a double planetary vacuum mixer to obtain 10000g of nickel-based solder alloy paste.

[0071] Step S2:

[0072] Fill the above prepared two slurries into the storage tank of a slurry 3D printing equipment with a twin-screw valve deposition head (note: because the viscosity of the slurry is relatively high, a screw extrusion valve is used).

[0073] Step S3:

[0074] The 3D digital model of the stainless steel open cup is established on the computer through the 3DMax modeling softwar...

Embodiment 2

[0082] Task: Print a copper alloy part with a square cavity

[0083] Step S1:

[0084] Mix 8500g of gas-atomized oxygen-free copper powder with a particle size of 10μm-53μm and 1500g of HJbinder-1318 water-based binder in a double planetary vacuum mixer to obtain 10000g of oxygen-free copper base material alloy slurry.

[0085] Mix 8600g of gas-atomized copper-based solder alloy BCuP6.2Sn7Ni1.5 powder with a particle size of 0.5μm to 75μm and 1400g of HJbinder-1318 water-based binder in a double planetary vacuum mixer to obtain 10000g of copper Base solder alloy paste.

[0086] Mix 8000g of alumina ceramic powder with a particle size of less than 75 μm and 2000g of HJbinder-1318 water-based binder in a double planetary vacuum mixer to obtain 10000g of alumina ceramic solder resist slurry.

[0087] Step S2:

[0088] Fill the above prepared three kinds of slurry into the storage tank of a slurry 3D printing equipment with 3 mechanical jet valve deposition heads (because the v...

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Abstract

The invention relates to a composite green body and a method for additive manufacturing of metal parts by using the composite green body, and belongs to the technical field of special additive manufacturing. The composite green body comprises a parent material green body, and a solder arranged inside and / or outside the parent material green body. During needing, the composite green body can further comprises a solder resist. Meanwhile, the invention further discloses the method for additive manufacturing of the metal parts by using the composite green body, the method is combined with the composite green body, the shrinkage rate of an obtained product is less than or equal to 5%, and the asymmetric deformation rate in the sintering process is less than or equal to 5%. The composite green body is reasonable in structure design, the application process is simple and controllable, the obtained product size is precise, and the large-scale industrialization application is facilitated.

Description

technical field [0001] The invention relates to a composite green body and a method for additively manufacturing metal parts using the composite green body. It belongs to the technical field of special additive manufacturing. Background technique [0002] Additive Manufacturing (AM) is commonly known as 3D printing. In the field of metal 3D printing, it is currently divided into two categories: one includes selective laser sintering (Selective Laser Sintering, SLS) technology, direct metal powder laser sintering (Direct Metal Laser Sintering, DMLS), selective laser melting (Selective LaserMelting, SLM) ) technology, Laser Engineered Net Shaping (LENS) technology and Electron Beam Selective Melting (EBSM) technology, etc. The industry refers to these technologies as "direct metal 3D printing technology". These technologies all involve expensive high-energy equipment such as lasers or electron beams. The materials used are relatively demanding, and the cost of use and maint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10B22F1/00B33Y10/00B33Y70/00
CPCB22F3/22B22F3/1003B33Y10/00B33Y70/00B22F2998/10B22F2998/00B22F1/10B22F2201/20
Inventor 李昕
Owner 长沙墨科瑞网络科技有限公司
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