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Technological process of making silicon carbide ceramic part based on smelting deposition and fast forming techn

A silicon carbide ceramic and fused deposition technology is applied in the new process field of ceramic parts, which can solve the problems of difficulty in meeting requirements, poor plasticity of silicon carbide materials, consumption of wood, etc., and achieves high dimensional accuracy and improves the effect of development speed.

Inactive Publication Date: 2007-07-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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.
And a large amount of wood consumption does not meet environmental protection requirements

Method used

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  • Technological process of making silicon carbide ceramic part based on smelting deposition and fast forming techn
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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Referring to Fig. 1, processing step of the present invention comprises:

[0022] 1.3D model design step, according to actual requirements, use Pro / E software to construct the three-dimensional data model of the workpiece, as shown in Figure 2; and store the model shown in Figure 2 as an STL format file;

[0023] 2. Use the layering software that comes with the rapid prototyping machine to do layering processing, and import the processed data into the manufacturing program; the above steps are mature technologies in this field.

[0024] 3. Put 100g of 2130# phenolic resin, 20g of starch, and 8g of benzenesulfonyl chloride into a container, and stir with a stirrer for 10 minutes to mix them evenly to make raw materials.

[0025] 4. As shown in Figure 3, the phenolic resin prototype was fabricated on the FDM rapid prototyping machine of Xi'an Jiaotong University. Pour the phenolic resin mixture 2 prepared in step 3 into the nozzle I (1), add polyethylene particles into t...

Embodiment 2

[0032] The difference between this embodiment and embodiment 1 is that in step 4, the movement speed of the three-dimensional workbench 10 is set to 25mm / s, the carbonization temperature in step 6: 1000°C, and the holding time: 0.5h; in step 7, The particle size of Si powder is 50 μm, the reaction temperature is 1550° C., the holding time is 1 h, and the rest are the same as in Example 1.

Embodiment 3

[0034] The difference between this embodiment and embodiment 1 is that in step 4, the movement speed of the three-dimensional workbench 10 is set to 20mm / s, the carbonization temperature in step 6: 1000°C, and the holding time: 0.5h; The particle size of Si powder is 75 μm, the reaction temperature is 1500° C., the holding time is 1 h, and the rest are the same as in Example 1.

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Abstract

The present invention proposes technological process of making silicon carbide ceramic part based on smelting deposition and fast forming technology, and the basic principle is the combination of smelting deposition and fast forming technique and reaction sintering technique of silicon carbide. The technological process adopts phenolic resin as main material, and includes fast forming prototype, providing organic template for the outer appearance and inner structure of silicon carbide ceramic, pyrolysis to convert into 3D carbon rack as inorganic template, and high temperature silicon impregnation for in-situ reaction on the carbon rack to form silicon carbide ceramic and composite material member. The present invention is superior to traditional ceramic member preparing process, can make ceramic part with complicated shape and precise size, and realizes the precise no-mold making of silicon carbide 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 rapid prototype pyrolysis of phenolic resin 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/632
Inventor 李涤尘崔志中
Owner XI AN JIAOTONG UNIV
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