SiC ceramic structural part and preparation method thereof

A technology for structural parts and ceramics, applied in the field of SiC ceramic structural parts and their preparation, can solve the problems of low density, high internal porosity and low bending strength of structural parts, so as to improve dimensional accuracy, improve mechanical properties, and reduce porosity. Effect

Active Publication Date: 2018-12-07
NAT INST CORP OF ADDITIVE MFG XIAN
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AI Technical Summary

Problems solved by technology

[0004] At present, although the SiC ceramics formed by SLS have obtained higher density after siliconizing reaction and sintering, the residual silicon content in the prepared specimens is relatively high, resulting in low density of the prepared structural parts, poor mechanical properties, low bending strength, and more Cannot be used in high temperature environment
The main reason is that the internal porosity of SiC powder is relatively high after SLS forming and degreasing, so that the silicon infiltrated into the specimen is too much during the siliconizing process, and there are more silicon residues after reaction sintering (RS), resulting in a decline in its mechanical properties; although The film coating method can reduce the porosity of the test piece after printing and degreasing, but the reduction rate is small, the cycle is longer, and the cost is higher than that of the dry mixing method

Method used

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  • SiC ceramic structural part and preparation method thereof
  • SiC ceramic structural part and preparation method thereof
  • SiC ceramic structural part and preparation method thereof

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preparation example Construction

[0031] The invention discloses a SiC ceramic structural part and a preparation method thereof, comprising the following steps:

[0032] S1. Construct the three-dimensional model of the structural part, and then convert the three-dimensional model into an STL format file;

[0033] S2. Slicing the STL format file through magics software to obtain the layer thickness and number of layers, and export it as an SLC file, and import the SLC format file into a 3D printer; the thickness of each layer is 0.05-0.2mm;

[0034] S3, mix SiC powder, C powder and binder powder, the mass percentage of SiC powder in the mixed powder is: 60%~90%, the mass percentage of C powder is: 5%~30%, the mass percentage of binder powder is 5%-30%; the binder includes epoxy resin or phenolic resin; the particle size of SiC powder is 10-200 μm, the particle size of C powder is 1-25 μm, and the particle size of adhesive powder is 1-10 μm; the mixed The powder is added into the mixer and mixed evenly to obtai...

Embodiment 1

[0045] Construct the structural part model and convert it into an STL format file, perform layered slice thickness and layer number on the STL format file, the layer thickness is 0.1mm, and export it as an SLC file and import it into the 3D printer; mix SiC powder, C powder and Epoxy resin powder, the SiC powder mass percentage content in the mixed powder is 60%, the C powder mass percentage content is 20%, the epoxy resin powder percentage content is 20%, obtain the uniform mixed powder after mixing by mixer; Put the ceramic powder into the barrel of the 3D printer to start printing. The working temperature of the working box is 40°C, the laser power is 16W, and the scanning speed is 2000mm / s. After printing, place the ceramic body at room temperature for 10 minutes. The body is subjected to cold isostatic pressing after sheathing treatment, the isostatic pressure is 200MPa; then it is degreasing, the degreasing temperature is 800°C, and the degreasing time is 30min; ; Remove...

Embodiment 2

[0047] Construct the structural part model and convert it into an STL format file, perform layered slice thickness and layer number on the STL format file, the layer thickness is 0.05mm, and export it as an SLC file and import it into a 3D printer; mix SiC powder, C powder and Phenolic resin powder, the mass percentage of SiC powder in the mixed powder is 70%, the mass percentage of C powder is 20%, and the percentage content of phenolic resin powder is 10%. After mixing by a mixer, a uniform mixed powder is obtained; the ceramic Put the powder into the barrel of the 3D printer and start printing. The working temperature of the working box is 30°C, the laser power is 18W, and the scanning speed is 3000mm / s. After the sheathing treatment, cold isostatic pressing treatment is carried out, and the isostatic pressure is 220MPa; then degreasing treatment is carried out, the degreasing temperature is 900°C, and the degreasing time is 40min; The residual silicon on the surface is rem...

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Abstract

The invention discloses a SiC ceramic structural part and a preparation method thereof. The method comprises the following steps: mixing SiC powder, C powder and adhesive powder, and preparing a ceramic body by SLS (Selective Laser Sintering). Firstly, appropriate grain composition uniform mixed powder is selected for printing forming, and the ceramic body is treated by an isostatic cool pressingtechnology, so that powder particles in the ceramic body are tightly arranged, and the density of the ceramic body is improved; and then, by virtue of siliconizing reaction sintering, SiC is formed byelemental silicon and elemental carbon particles in the sintering process, presence of the elemental silicon in the test piece is reduced, the density of the test piece is further improved by the SiCproduced in the reaction, the porosity of the test piece is reduced, and the mechanical property of the test piece is improved; and when the SiC ceramic is subjected to 3D printing in the method, thepowder C serves as one of the raw materials, the grain composition of the powder C and powder SiC is adjusted, and preparation is made for subsequent isostatic cool pressing and reactive sintering. The structural part prepared by the method disclosed by the invention has the density of 3.01-3.11g/cm<3> and the bending strength of 290-330 MPa.

Description

【Technical field】 [0001] The invention belongs to the field of SiC ceramic preparation, and relates to a SiC ceramic structural part and a preparation method thereof. 【Background technique】 [0002] Ceramics have excellent mechanical properties, high bending strength, excellent oxidation resistance, good corrosion resistance, high wear resistance and low friction coefficient, while SiC ceramics have high temperature mechanical properties, strength and creep resistance. The best known ceramic material. The high temperature strength of SiC ceramic materials sintered by hot pressing, pressureless sintering and hot isostatic pressing can be maintained up to 1600°C, which is the material with the best high temperature strength among ceramic materials. Therefore, using this material to make spacecraft can be said to be the best use of everything. [0003] With the development of industry, these traditional crafts can no longer meet the needs of high-tech products. 3D printing r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/573C04B35/622B28B1/00B33Y10/00B33Y70/00
CPCB28B1/001B33Y10/00B33Y70/00C04B35/565C04B35/573C04B35/622C04B2235/422C04B2235/5427C04B2235/5436C04B2235/6026C04B2235/77C04B2235/96
Inventor 满积友鲍崇高宋索成赵纪元
Owner NAT INST CORP OF ADDITIVE MFG XIAN
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