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Method for preparing porous SiC ceramic based on 3D (three dimensional) molding technology

A ceramic and technical technology, which is applied in the field of preparing porous SiC ceramics based on 3D molding technology, can solve the problems of low porosity of molded parts, and achieve the effects of fast molding speed, high raw material utilization, high porosity and strength

Inactive Publication Date: 2018-01-19
HARBIN UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low porosity of molded parts when the current selective laser sintering technology (SLS technology) prepares porous SiC ceramics, and provides a method for preparing porous SiC ceramics based on 3D forming technology

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  • Method for preparing porous SiC ceramic based on 3D (three dimensional) molding technology

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specific Embodiment approach 1

[0020] Specific Embodiment 1: The method for preparing porous SiC ceramics based on 3D forming technology in this embodiment is carried out according to the following steps:

[0021] 1. Draw the 3D model of porous SiC ceramics, and then convert it into an STL format file;

[0022] 2. Import the STL format file into the SLS molding machine, set the scanning speed to 1000mm / s~2000mm / s, the thickness of each layer to 0.05mm~0.2mm, and the preheating temperature to 40~70℃, and then use the computer layered slicing software Process the model into thin slices with a set thickness;

[0023] 3. Pour SiC powder, binder powder and pore-forming agent into the mixer to mix the powder to obtain a uniformly mixed composite powder;

[0024] 4. Add the composite powder into the working cylinder of the SLS molding machine, use the roller to spread the powder, let it stand for 30 minutes, then heat the working cylinder to the preheating temperature set in step 2, start processing, laser sinter...

specific Embodiment approach 2

[0031] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, the scanning speed is set to 1000 mm / s, the thickness of each layer is 0.1 mm, and the preheating temperature is 45 ° C. Others are the same as specific embodiment 1. .

specific Embodiment approach 3

[0032] Specific embodiment three: this embodiment is different from specific embodiment one or two in that: in step three, the speed of the mixer is 50r / min, and the powder mixing time is 8h, and the others are the same as specific embodiment one or two.

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Abstract

The invention relates to a method for preparing porous SiC ceramic based on a 3D (three dimensional) molding technology, and aims at solving the problem that a molding part is low in porosity when theporous SiC ceramic is prepared by a selective laser sintering (SLS) technology currently. The method provided by the invention comprises the steps of drawing a three-dimensional model of the porous SiC ceramic, setting parameters of an SLS molding machine, mixing SiC powder, binder powder and a pore-forming agent, preparing a ceramic body, performing CIP sheathing, and then performing cold isostatic pressing compacting treatment, performing degreasing presintering, and then sintering in an aerobic environment. The method has the advantages that the operation is simple, the molding speed is high, the raw material utilization ratio is high, the porosity of the porous SiC ceramic is effectively improved, a final molding part has the porosity of 70 to 80%, and certain strength is realized. The method is applied to the field of porous SiC ceramic preparation.

Description

technical field [0001] The invention relates to a preparation process of porous SiC ceramics, in particular to a method for preparing porous SiC ceramics based on 3D forming technology. Background technique [0002] Porous ceramics are ceramic materials with continuous open pores or closed pores inside. Porous ceramics have certain mechanical properties while having high porosity. It has a large specific surface area, can be used in high temperature and chemically corrosive environments, and has high chemical stability, wear resistance and mechanical strength. Non-oxide ceramics have better high-temperature stability and mechanical strength, among which silicon carbide is a covalently bonded compound with extremely high stability. Porous silicon carbide ceramic material has the advantages of both silicon carbide ceramics and porous ceramics, and has the characteristics of high mechanical strength, good wear resistance, strong chemical stability, high porosity, and large sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B38/00B28B1/00B28B11/24
Inventor 曾涛孙晓梅
Owner HARBIN UNIV OF SCI & TECH
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