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Metal powder injection molding wire material for large-size 3D printing and preparation method of metal powder injection molding wire material

A metal powder, 3D printing technology, used in additive processing and other directions, can solve problems such as delamination and mechanical properties degradation

Pending Publication Date: 2019-07-09
深圳市众德祥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the present invention, the solution to the above-mentioned technical problems is to solve the toughness problem of the wire by finding a toughening agent that is more suitable for the metal powder injection molding wire process, and to use a compound adhesive with more excellent performance that has been optimized through many tests. Adhesives to solve the problem of material delamination and mechanical property degradation

Method used

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  • Metal powder injection molding wire material for large-size 3D printing and preparation method of metal powder injection molding wire material
  • Metal powder injection molding wire material for large-size 3D printing and preparation method of metal powder injection molding wire material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The total components of the binder are according to the following formula, according to weight percentage:

[0029] Polyoxymethylene copolymer 83wt.%, backbone polymer 8wt.%, toughening agent 5wt.%, adhesive 4wt.%.

[0030] The backbone high polymer is selected from modified polypropylene, which can ensure good compatibility with polyoxymethylene, and the parts have good shape retention after degreasing. Ethylene-vinyl acetate copolymer with good compatibility, the selection of ethylene-vinyl acetate copolymer is of great help to the toughness of the wire and the adhesion between the wires under the interaction with the adhesive.

[0031] (2) The total composition of the metal powder: select a tap density of 4.5-5.2g / cm 3 , particle size D50=4-15μm, gas-atomized 316L metal powder.

[0032] (3) The weight percentage of the total binder component to the metal powder component is 1: (7-8).

[0033] The preparation steps are as follows:

[0034] S1, measure accordin...

Embodiment 2

[0037] (1) The total components of the binder are according to the following formula, according to weight percentage:

[0038] Polyoxymethylene copolymer 85wt.%, backbone polymer 7wt.%, toughening agent 4wt.%, adhesive 4wt.%.

[0039] (2) The total composition of the metal powder: select a tap density of 4.5-5.2g / cm 3 , particle size D50=4-15μm, gas-atomized 316L metal powder.

[0040] (3) The weight percentage of the total binder component to the metal powder component is 1: (7-8).

[0041] The preparation steps are as follows:

[0042] The backbone high polymer is selected from modified polyethylene, which has good compatibility with polyoxymethylene and can improve the high toughness of the prepared wire. The toughness of the wire prepared from the material is of great help.

[0043] The preparation steps are as follows:

[0044] S1, measure and mix according to the above ratio: put each component into the high-speed mixer and mix according to the above formula. The spee...

Embodiment 3

[0047] (1) The total components of the binder are according to the following formula, according to weight percentage:

[0048] Polyoxymethylene copolymer 83wt.%, backbone polymer 8wt.%, toughening agent 5wt.%, adhesive 4wt.%.

[0049] (2) The total composition of the metal powder: select a tap density of 4.5-5.2g / cm 3 , particle size D50=4-15μm, gas-atomized 316L metal powder.

[0050] (3) The weight percentage of the total binder component to the metal powder component is 1: (7-8).

[0051] The backbone high polymer is selected from the modified polyethylene in Case 2, and the toughening agent is low-molecular-weight EPDM with low molecular weight. For the selected low-molecular-weight EPDM, it belongs to rubber , in the process of sintering, there may be a problem of carbon residue due to the large molecular weight, which has a negative impact on the performance of the product. Therefore, the low molecular weight EPDM rubber should be selected as small as possible when sel...

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Abstract

The invention discloses a metal powder injection molding wire material for large-size 3D printing and a preparation method of the metal powder injection molding wire material. The formula of the metalpowder injection molding wire material comprises, in percent by weight, 80-90% of copolymerized formaldehyde, 4-8% of backbone polymer, 3-6% of a toughening agent and 3-6% of adhesives, wherein the amount of the total adhesive component is counted in percentage by weight, a metal powder component is gas-atomized metal powder with a tap density of 4.5-5.2 g / cm<3> and a particle diameter D50 of 4-15 [mu]m, and the weight ratio of the total adhesive component to the metal powder component is 1:(7-8). Through the prepared metal powder injection molding wire material, two problems common in the actual application process of the industry are solved, wherein the problem of brittle hardness of prepared wires during 3D printing is solved through finding of a more suitable toughening agent in the industry, and the problem of poor adhesion and easy lamination of the wires for 3D printing is solved through continuous optimization of the adhesives with better performance.

Description

technical field [0001] The invention relates to the technical field of metal powder injection molding (MIM), in particular to a metal powder injection molding wire for large-scale 3D printing and a preparation method thereof. Background technique [0002] 3D printing (3DP) is a kind of rapid prototyping technology. It is a technology based on digital model files and using bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing. The most mature and widely used 3D printing technology is the fused deposition manufacturing (FDM) process. The materials of FDM are generally thermoplastic materials, such as wax, ABS, nylon, etc., and are supplied in wire or filament form. The FDM material is heated and melted in the nozzle, and the nozzle moves along the cross-sectional profile of the part and the filling track, and at the same time extrudes the molten material, and the material solidifies rapidly and coagulates with the surrounding mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L23/06C08L23/12C08L23/16C08L23/08C08K3/08B33Y70/00
CPCB33Y70/00C08L59/00C08L2205/035C08L23/12C08L23/0853C08L67/00C08L71/00C08K3/08C08L23/06C08L23/0815C08L23/16
Inventor 刘相权
Owner 深圳市众德祥科技有限公司