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Method for preparing hard alloy with three-dimensional structure through photocuring 3D printing

A 3D printing and three-dimensional structure technology, applied in the field of additive manufacturing, can solve the problems of discontinuous large holes and small holes, high sphericity and high loose packing density

Active Publication Date: 2022-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Methods such as SLM / SLS / LENS based on high-energy beams not only require high performance of raw material powders (high purity, fine particle size, narrow particle size distribution, high sphericity, good fluidity, and high bulk density, etc.), but also The WC phase is extremely easy to lose carbon and transform into W under the irradiation of high-energy beams. 2 C causes the phase to be impure;
[0007] The surface quality of cemented carbide printed by extrusion-based DIW and FFF3D is poor, there are detailed interlayer traces, and there are discontinuous large holes and scattered small holes in the local interior;

Method used

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  • Method for preparing hard alloy with three-dimensional structure through photocuring 3D printing
  • Method for preparing hard alloy with three-dimensional structure through photocuring 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using sodium tungstate as tungsten salt, three-dimensional structure cemented carbide was prepared by light-curing 3D printing:

[0047] At room temperature, deionized water (5 g), sodium tungstate (5 g), cobalt acetate (1 g), acrylic acid (5 g) and N, N'-methylenebisacrylamide (0.2 g) were mixed with photoinitiator TPO (0.1g) were mixed, and magnetically stirred to prepare photocurable 3D printing ink. The temperature for all operations was controlled at around 20°C.

[0048] Then carry out photo-curing 3D printing, the photo-curing 3D printing layer thickness is 0.01mm, and the exposure time of each layer is 1s.

[0049] The printed green body was taken out from the trough, and then placed at a humidity of 80% and a temperature of 60°C for 96 hours to make the green body completely dry.

[0050] Finally, the green body was placed in hydrogen, and the temperature was raised to 500°C at a rate of 0.5°C / min for 2 hours, and the temperature was raised to 900°C at a rate...

Embodiment 2

[0052] Using ammonium paratungstate as tungsten salt, three-dimensional structure cemented carbide was prepared by light-curing 3D printing

[0053] At room temperature, deionized water (4 g), ammonium paratungstate (6 g), cobalt nitrate (1 g), acrylic acid (6 g) and ethyl methacrylate (0.3 g) were magnetically stirred with photoinitiator 651 (0.1 g) to prepare Light curing 3D printing ink. The temperature for all operations was controlled at around 20°C.

[0054] Then carry out photo-curing 3D printing, the photo-curing 3D printing layer thickness is 0.01mm, and the exposure time of each layer is 1s.

[0055] The molded green body is taken out from the trough, and then placed at a humidity of 80% and a temperature of 70° C. for 48 hours to make the green body completely dry.

[0056] Finally, the green body was placed in hydrogen, and the temperature was raised to 400°C at a rate of 0.5°C / min for 2 hours, and the temperature was raised to 1000°C at a rate of 5°C / min under v...

Embodiment 3

[0058] Using ammonium metatungstate as tungsten salt, three-dimensional structure cemented carbide was prepared by light-curing 3D printing

[0059] At room temperature, deionized water (3g), ammonium metatungstate (10g), cobalt acetate (1.5g), acrylic acid (6g) and polyethylene glycol dimethacrylate (1g) were mixed with photoinitiator TPO- L (0.1g) was subjected to magnetic stirring to prepare photocurable 3D printing ink. The temperature for all operations was controlled at around 20°C.

[0060] Then carry out photo-curing 3D printing, the photo-curing 3D printing layer thickness is 0.01mm, and the exposure time of each layer is 1s.

[0061] Take the molded green body out of the trough, put it in a freeze dryer, let it cool down to -70°C, then gradually raise the temperature to 20°C, and make the green body completely dry with a vacuum degree of 0.01MPa.

[0062] Finally, the green body was placed in hydrogen, and the temperature was raised to 500 ° C at a rate of 0.5 ° C ...

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Abstract

According to the method for preparing the hard alloy of the three-dimensional structure through photocuring 3D printing, water-soluble tungsten salt serves as a tungsten source, water-soluble cobalt salt serves as a cobalt source to prepare printable ink, a blank of the three-dimensional structure is formed through photocuring 3D printing, then a high-temperature aftertreatment process is combined for treatment, and finally the hard alloy of the three-dimensional structure is obtained. The method is ingenious in preparation strategy, the 3D printed hard alloy is high in surface quality, the requirement for raw materials is low, cost is low, and the method is suitable for industrial production and application.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for preparing three-dimensional structure cemented carbide by photocuring 3D printing. Background technique [0002] Cemented carbide is a multiphase composite material with one or more refractory metal carbides (such as WC or TiC) as the matrix and transition metals (such as Fe, Co, Ni and their alloys) as the binder phase. Because of its high hardness, strength, elastic modulus, toughness and wear resistance, as well as excellent corrosion resistance and thermal shock resistance, the application of cemented carbide has expanded from metal cutting of processing tools to Oil drilling, mining engineering, electronic communication and many other fields have occupied an important position for a long time, and are known as "the teeth of industry". [0003] At present, cemented carbide is mainly produced by powder metallurgy, that is, firstly mixing and grin...

Claims

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Application Information

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IPC IPC(8): B22F1/105B22F10/20B33Y10/00C22C29/00C22C29/08
CPCB22F10/20C22C29/067C22C29/08B33Y10/00Y02P10/25
Inventor 王小锋时凯华王新宇昝秀颀舒军廖军什洛莫·玛格达西王日初
Owner CENT SOUTH UNIV
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