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Waterborne Si3N4 based 3D printing method for green body and waterborne Si3N4 based 3D printing forming method

A silicon nitride-based, 3D printing technology, applied in the 3D field, can solve the problems of demanding liquid operation, layered texture on the surface, unfavorable long-term storage, etc., and achieve the effect of low cost, fast curing time and simple drying process

Inactive Publication Date: 2018-05-11
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there is a layered texture on the surface, the forming accuracy is poor, and subsequent grinding is required
Photocuring is a 3D printing technology with the highest molding precision, high efficiency, high integration, and high material utilization rate. The working principle of printing ceramic powder is to selectively solidify the liquid photosensitive resin with ceramic powder or precursor by laser. Complicated parts are then dried, degreased, and sintered, so that although the high precision of the molded ceramic products can be guaranteed, the equipment is relatively expensive, and the system has strict requirements for liquid operation. Most of the molded parts are resins, and the materials are expensive and have limited performance. Good for long-term storage, serious environmental pollution

Method used

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  • Waterborne Si3N4 based 3D printing method for green body and waterborne Si3N4 based 3D printing forming method
  • Waterborne Si3N4 based 3D printing method for green body and waterborne Si3N4 based 3D printing forming method

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Effect test

Embodiment 1

[0042] This embodiment provides a water-based silicon nitride-based 3D printing molding method, comprising the following steps:

[0043] S1. Using water as the carrier, add 50wt% monomer N,N-methylenebisacrylamide (DMAA) and 1wt% crosslinking agent methylenebisacrylamide (MBAM) to deionized water, The dispersant PAA-NH4 is 4wt%, the catalyst tetramethylethylenediamine (TMEDA) is 3wt%, the defoaming agent is 0.1~1wt%%, and the pH value of the solution is controlled at about 9 by ammonia water, and the volume ratio is 45 %Si 3 N 4 The base powder is mixed by ball milling to obtain a suspension slurry A with low viscosity and high solid phase volume fraction for subsequent use;

[0044] S2. configuration concentration is that the initiator ammonium persulfate solution of 1% is standby as substance B;

[0045] S3. place the material A prepared in step S1 figure 2 In the slurry tank 1, and stir. Place the B material prepared in step S2 figure 2 In the storage tank 2;

[00...

Embodiment 2

[0053] This embodiment provides a water-based silicon nitride-based 3D printing molding method, comprising the following steps:

[0054] S1. Using water as the carrier, add 45wt% monomer N,N-methylenebisacrylamide (DMAA) and 0.5wt% crosslinking agent methylenebisacrylamide (MBAM) to deionized water , the dispersant PAA-NH4 is 3wt%, the catalyst tetramethylethylenediamine (TMEDA) is 2wt%, the defoaming agent is 0.1~1wt%%, the pH value of the solution is controlled at about 9 by ammonia water, and then the volume ratio is 45% Si 3 N 4 The base powder is mixed by ball milling to obtain a suspension slurry A with low viscosity and high solid phase volume fraction for subsequent use;

[0055] S2. configuration concentration is that the initiator ammonium persulfate solution of 1% is standby as substance B;

[0056] S3. place the material A prepared in step S1 figure 2 In the slurry tank 1, and stir. Place the B material prepared in step S2 figure 2 In the storage tank 2;

...

Embodiment 3

[0062] This embodiment provides a water-based silicon nitride-based 3D printing molding method, comprising the following steps:

[0063] S1. Using water as the carrier, add 55wt% monomer N,N-methylenebisacrylamide (DMAA) and 1.5wt% crosslinking agent methylenebisacrylamide (MBAM) to deionized water , the dispersant PAA-NH4 is 5wt%, the catalyst tetramethylethylenediamine (TMEDA) is 4wt%, the defoamer is 0.1~1wt%%, the pH value of the solution is controlled at about 9 by ammonia water, and then the volume ratio is 45% Si 3 N 4 The base powder is mixed by ball milling to obtain a suspension slurry A with low viscosity and high solid phase volume fraction for subsequent use;

[0064] S2. configuration concentration is that the initiator ammonium persulfate solution of 1% is standby as substance B;

[0065] S3. place the material A prepared in step S1 figure 2 In the slurry tank 1, and stir. Place the B material prepared in step S2 figure 2 In the storage tank 2;

[0066]...

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Abstract

The invention relates to the technical field of 3D and discloses a waterborne Si3N4 based 3D printing forming method. The waterborne Si3N4 based 3D printing forming method comprises the following steps: S1, water is taken as a carrier, monomer N,N'-methylenebisacrylamide, crosslinker methylenebisacrylamide as well as dispersants PAA-NH4 and TMEDA are added to deionized water, pH of the solution iscontrolled to 9 by ammonium hydroxide, then Si3N4 based powder in the volume ratio of 20%-65% is added to the solution, ball-milling and stirring are performed, and suspension slurry A with low viscosity and high solid volume fraction is obtained for standby application; S2, initiator ammonium persulfate capable of being subjected to a gelling reaction with the organic monomer in S1 is prepared and serves as a substance B for standby application; S3, the slurry A in S1 and the substance B in S2 are mixed uniformly, and a mixture C is obtained; S4, the mixture C is conveyed to a 3D printing head, focus microwaves capable of accelerating organic monomer polymerization are applied to the 3D printing head, so that the 3D printing head performs printing in the atmosphere of the focus microwaves according to 3D model data, layer-by-layer stacking forming is realized, and a green body in a required shape is obtained finally.

Description

technical field [0001] The present invention relates to the field of 3D technology, and more specifically, relates to a water-based silicon nitride-based 3D printing body method and a forming method thereof. Background technique [0002] 3D printing technology is an emerging rapid prototyping technology that manufactures three-dimensional objects by layering materials [0003] The technology of structural objects is different from the traditional material removal manufacturing technology, so it is also called additive manufacturing. 3D printing mainly includes selective laser sintering technology (SLS), fusion deposition technology (FDM) and stereolithography technology (SLA). [0004] The high-strength and high-hardness characteristics of advanced ceramic materials and hard materials make them difficult to process and form. The development of science and technology requires higher and higher complexity and precision of ceramic and hard alloy parts, which has become the bigg...

Claims

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Application Information

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IPC IPC(8): C04B35/584B28B1/00B33Y10/00C04B35/622
CPCB28B1/001B33Y10/00C04B35/584C04B35/622C04B2235/608C04B2235/61
Inventor 银锐明徐凯
Owner HUNAN UNIV OF TECH