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Method for preparing ceramic through 3D printing forming based on modified Na2SiO3 binder

A 3D printing and ceramic preparation technology, applied in the field of 3D printing applications, can solve problems such as limited product strength improvement, environmental pollution, and loss of structural collapse strength of 3D printed products, so as to improve compressive strength, reduce environmental pollution, and solve Effect of Loss of Structural Collapse Strength

Inactive Publication Date: 2019-11-01
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the adhesive used in this technology is an organic adhesive represented by furan resin. The organic adhesive seriously pollutes the environment during use, and will fail at higher temperatures, resulting in structural collapse of 3D printed products in high temperature environments. The problem of loss of breaking strength
Although post-processing can solve this problem to a certain extent, the post-processing process increases the preparation cycle and cost of 3D printing ceramics, and the strength of the product is limited.

Method used

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  • Method for preparing ceramic through 3D printing forming based on modified Na2SiO3 binder
  • Method for preparing ceramic through 3D printing forming based on modified Na2SiO3 binder
  • Method for preparing ceramic through 3D printing forming based on modified Na2SiO3 binder

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] Such as figure 1 : A ceramic preparation method based on modified sodium silicate binder 3D printing, comprising the following steps:

[0027] S1: powder treatment, uniformly mix the curing agent and the oxide ceramic powder; the curing agent can be a solid curing agent or a liquid curing agent, and the amount of the curing agent is 0.16% to 0.75% of the weight of the oxide ceramic powder.

[0028] Among them, the solid curing agent mainly includes but is not limited to dicalcium silicate, Portland cement, or a combination of two;

[0029] The liquid curing agent mainly includes one or more combinations of glycerin monoacetate, glycerin diacetate, and glycerin triacetate;

[0030] Alternatively, the liquid curing agent includes, but is not limited to, one or more combinations of ethylene glycol diacetate, diethylene glycol diacetate, ethylene glycol propionate, propylene carbonate, and fluosilicic acid.

[0031] The oxide ceramics include any one of silica ceramics, a...

Embodiment 1

[0037] S1: powder treatment, Al 2 o 3 The curing agent composed of ceramic powder and a mixture of glycerin monoacetate, glycerin diacetate and triacetin is mixed evenly, and the addition amount of the curing agent mixture is Al 2 o 3 0.3% by weight of ceramic powder.

[0038] S2: 3D printing ceramic products, with Al in S1 2 o 3 The ceramic mixed powder is used as the matrix, and the 3D printed ceramic green body is obtained after printing and sand cleaning. The amount of sodium silicate binder added is Al 2 o 3 3% by weight of ceramic mixed powder.

[0039] S3: sintering, heat the 3D printed ceramic green body in step S2 at a temperature of 1680° C. for 2 hours, and cool down to obtain a 3D printed alumina ceramic product.

[0040] Such as figure 2 Shown: This picture is 3D printing Al 2 o 3 The scanning electron microscope picture of the green body before sintering shows that there are many and large gaps on the surface before sintering, and the cementation effec...

Embodiment 2

[0043] S1: powder treatment, Al 2 o 3 The curing agent composed of ceramic powder and a mixture of glycerin monoacetate, glycerin diacetate and triacetin is mixed evenly, and the addition amount of the curing agent mixture is Al 2 o 3 0.3% by weight of ceramic powder.

[0044] S2: 3D printing ceramic products, with Al in S1 2 o 3 The ceramic mixed powder is used as the matrix, and the 3D printed ceramic green body is obtained after printing and sand cleaning. The amount of sodium silicate binder added is Al 2 o 3 3% by weight of ceramic mixed powder.

[0045] S3: sintering, heat the 3D printed ceramic green body in step S2 at a temperature of 1630° C. for 2 hours, and obtain 3D printed alumina ceramic products after cooling down.

[0046] 3D printing Al after processing by the method of this example 2 o 3 The compressive strength of ceramic products is 8.85MPa.

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Abstract

The invention discloses a method for preparing ceramic through 3D printing forming based on a modified Na2SiO3 binder. The method comprises the following steps: S1) powder treatment: uniformly mixinga curing agent with oxide ceramic powder; s2) 3D printing of a ceramic product: by using a Na2SiO3 inorganic binder, with the oxide ceramic mixed powder in the step S1 as a matrix, performing printingand sand removal to obtain a 3D printed ceramic green body; and S3) sintering: carrying out heat preservation on the 3D printing ceramic green body in the step S2) at the temperature of 1580 DEG C orabove, and cooling the sintered green body to obtain a finished product. According to the invention, a siloxane (Si-O-Si) three-dimensional network structure is formed in the 3D printing process by adopting the sodium silicate inorganic binder and the curing agent, and the structure can be further reinforced through dehydration and polycondensation in the high-temperature sintering process, so that the compressive strength of the 3D printing ceramic product is greatly improved.

Description

technical field [0001] The invention relates to the technical field of 3D printing applications, in particular to a ceramic preparation method based on modified sodium silicate binder 3D printing. Background technique [0002] High-temperature structural ceramics have a low thermal expansion coefficient, excellent thermal shock resistance and good economy, and are widely used in the fields of metal smelting and casting. However, the preparation of traditional oxide ceramics not only requires the use of molds to prepare shapes, but also has high manufacturing costs and long production cycles, and once the processing is completed, it cannot be changed in shape or modified in shape. [0003] Binder jetting 3D printing technology is based on the principle of discrete-accumulation molding and droplet jetting, using nozzles to selectively jet liquid binders to directly form solid ceramic powder materials into three-dimensional solid parts. 3D printing technology realizes moldless...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63C04B35/14C04B35/10C04B35/64B33Y10/00B28B1/00
CPCC04B35/6316C04B35/14C04B35/10C04B35/64B33Y10/00B28B1/001C04B2235/6026C04B2235/48C04B2235/96C04B2235/3454
Inventor 何培王威徐婷婷徐海燕李军李炯卢晟苏宁
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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