Technological process of forming composite silicon carbide ceramic material based on pyrolysis of photocured prototype

A technology of silicon carbide ceramics and composite materials, which is applied in the field of silicon carbide ceramic composite material forming technology based on photocuring prototype pyrolysis, can solve problems such as difficulty in meeting requirements, poor plasticity of silicon carbide materials, plastic forming parts, etc. The effect of high development speed and dimensional accuracy

Inactive Publication Date: 2005-04-27
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

The traditional preparation process is to make green bodies from powder raw materials, and then sinter them at high temperature to manufacture components. The green bodies made by this method cannot meet the requirements in terms of dimensional accuracy and shape complexity.
At present, the most commonly used method is plastic molding of powder, but it has high requirements on the rheological properties of raw materials, and silicon carbide materials have poor plasticity, and it is difficult to plastically form complex and precise parts.
The recent method of using wood, natural fibers, etc. as organic templates for in-situ conversion to prepare silicon carbide ceramic parts is difficult to meet the requirements due to the uneven structure of natural wood or fibers and large individual differences.

Method used

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  • Technological process of forming composite silicon carbide ceramic material based on pyrolysis of photocured prototype
  • Technological process of forming composite silicon carbide ceramic material based on pyrolysis of photocured prototype
  • Technological process of forming composite silicon carbide ceramic material based on pyrolysis of photocured prototype

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Experimental program
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Effect test

Embodiment 1

[0019] see figure 1 , process step of the present invention comprises:

[0020] 1. 3D model design step, according to actual requirements, use Pro / E software to construct the 3D data model of the workpiece, such as figure 2 shown; and figure 2 The model shown is stored as an STL format file;

[0021] 2. Use the layering software that comes with the rapid prototyping machine for layering processing, and import the processing data into the manufacturing program;

[0022] 3. Manufacture the resin prototype on the photocuring rapid prototyping machine; the above steps are mature technologies in this field.

[0023] 4. Put the resin prototype obtained by photocuring into a crucible, put it into a vacuum high-temperature furnace for carbonization, heating rate: 100°C / h, carbonization temperature: 600°C, holding time: 4h, then cool to room temperature with the furnace and take it out. Get the three-dimensional carbon support of the workpiece, such as image 3 shown;

[0024] ...

Embodiment 2

[0027] The difference between this example and Example 1 is that in step 4, the carbonization temperature is 500°C, and the holding time is 5h; in step 5, the Si powder particle size is 50 μm, the reaction temperature is 1500°C, and the holding time is: 1h, all the other are the same as in Example 1.

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Abstract

The technological process of the present invention has basic principle as the combination of fast photocuring formation technology and SiC reaction sintering technology. The technological process includes the main steps of: fast photocuring formation of prototype as the organic template of SiC part with liquid photosensitive resin; pyrolysis to convert the organic template into 3D carbon rack as the inorganic template; impregnating silicon at high temperature for in-situ reaction of Si on the carbon rack to form SiC ceramic part. The present invention alters traditional ceramic member preparing process, can make ceramic parts with complicated shape and precise size, and realizes the no-mold precision manufacture of SiC ceramic part.

Description

technical field [0001] The invention relates to a new technology for ceramic parts, in particular to a silicon carbide ceramic composite material molding method based on light-cured prototype pyrolysis with complex shape and high dimensional accuracy. Background technique [0002] Silicon carbide ceramic material is one of the most important high-performance engineering ceramic materials, and its parts are widely used and urgently needed in petrochemical, aerospace, national defense and military industries. The traditional preparation process is to make green bodies from powder raw materials, and then sinter them at high temperature to manufacture components. The green bodies made by this method cannot meet the requirements in terms of dimensional accuracy and shape complexity. At present, the most commonly used method is plastic molding of powder, but it has high requirements on the rheological properties of raw materials, and silicon carbide materials have poor plasticity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/634
Inventor 李涤尘乔冠军崔志中
Owner XI AN JIAOTONG UNIV
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