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Method for 3D ceramic printing forming

A 3D printing and ceramic technology, applied in ceramic molding machines, manufacturing tools, etc., can solve problems such as expensive equipment, high requirements for ceramic substrates, and impact on ceramic performance, to reduce research and development cycles and costs, low equipment costs, and relative density. high effect

Active Publication Date: 2015-04-22
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation of ceramic materials by stereolithography (SLA) has not been widely used due to the high cost of the liquid photosensitive resin used, the small range of options, the resin has certain toxicity, and the equipment is expensive; the existing selective laser sintering (SLS), The preparation of ceramic materials by three-dimensional printing (3DP) has the problems of large spacing between ceramic powder particles and low green body density, which cannot be densified during high-temperature sintering, and the performance of ceramics is affected; High requirement for sheet, difficult to remove excess material

Method used

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  • Method for 3D ceramic printing forming

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Experimental program
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Effect test

Embodiment 1

[0029] like figure 1 Shown, processing step of the present invention comprises:

[0030] 1) Establishment of 3D model. According to actual needs, use Pro / E or AutoCAD software to construct the 3D model of the part, and convert the 3D model data into an STL format file;

[0031] 2) Use the layering software of the rapid prototyping machine to layer the 3D model, and import the layered data into the manufacturing program;

[0032] 3) Take 250g of reaction-bonded silicon carbide raw material powder (mixed carbon powder and α-SiC at a mass ratio of 1:4-99), 0.306g of ammonia water, 40g of deionized water and stir for 30min, then add 1.8g of tributyl phosphate, 1.5 g gelatin, milled in a high-speed ball mill for 2 hours;

[0033] 4) Defoam the ball-milled slurry for 10 minutes in a vacuum defoaming machine at -0.08MPa vacuum;

[0034] 5) Put the defoamed slurry in the barrel of a rapid prototyping machine (preferably a motor-driven micro-injection 3D printer), start heating the...

Embodiment 2

[0039] The difference between this example and Example 1 is that the ceramic powder used in step 3) is alumina ceramic powder, the curing agent is agarose, and the sintering in step 8) is: heating from room temperature at a rate of 2°C / min to 500°C, then raise the temperature to 800°C at a rate of 10°C / min, and then raise the temperature to 1700°C at a rate of 8°C / min and hold for 2 hours. The obtained alumina ceramics have a sintered density of 3.85 g / cm 3 above.

Embodiment 3

[0041] The difference between this example and Example 1 is that the ceramic powder used in step 3) is zirconia ceramic powder, the curing agent is organic monomer acrylamide and crosslinking agent methylenebisacrylamide, and in step 8) Sintering: from room temperature to 500°C at a rate of 2°C / min, then to 800°C at a rate of 10°C / min, and then to 1460°C at a rate of 8°C / min for 3 hours to obtain a zirconia ceramic The sintered density is 5.55 g / cm 3 above.

[0042] The present invention is based on the 3D printing molding technology for preparing ceramic parts. By adding a curing agent to the water-based ceramic slurry, rapid prototyping is performed in a 3D printer, and ceramic materials of desired shape are obtained through drying, dewaxing and sintering. The basic principle of the present invention is to use the gel curing characteristics of water-soluble gel substances, add a certain amount of gel curing agent to the water-based ceramic slurry, and vacuum defoam after ba...

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Abstract

The invention discloses a method for 3D ceramic printing forming. The method comprises the following steps that (1) a 3D model of a target part is established; (2) layering processing is performed, and layered data are imported into a manufacturing program; (3) ceramic slurry is prepared; (4) the prepared ceramic slurry is added into a 3D printer to be made into a ceramic green body quickly formed; (5) the green body is cured at curing temperature for 10 min-60 min and then is placed in a drying oven for drying; (6) the dried green body is dewaxed and sintered to be made into the target part. The method is simple in technology and low in equipment cost; the distance between powder particles in the ceramic slurry can be reduced in the extrusion process, and therefore density is high; besides, the method is not limited by the type of ceramic particles and the shape of the part and is suitable for manufacturing ceramic products made of various ceramic materials and in various complex shapes.

Description

technical field [0001] The invention relates to a ceramic 3D printing molding method. Background technique [0002] Ceramic materials have excellent mechanical properties (high strength, high hardness, high wear resistance), thermal properties (high temperature resistance, low thermal expansion coefficient and thermal shock resistance) and chemical stability, and are widely used in petrochemical, iron and steel metallurgy, machinery Electronics, aerospace, energy and environmental protection, nuclear energy, automobiles, high-temperature furnaces and other industrial fields. At present, the molding methods of ceramic materials mainly include: extrusion molding, injection molding, isostatic pressing molding, tape casting, etc. When preparing components by these processes, it is necessary to prepare a mold with a corresponding shape according to the shape of the component. , it is necessary to re-prepare the mold or mechanically process the sample, thus increasing the prepara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/00C04B35/63
CPCB28B1/00C04B35/63
Inventor 邬国平李妙妙谢方民
Owner NINGBO VULCAN TECH CO LTD
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