Method for preparing laser sintering rapid prototyping type silicon carbide ceramics

A technology of silicon carbide ceramics and laser sintering, applied in the direction of additive processing, etc., can solve the problems of high brittleness, high cost of mold processing, poor processing performance, etc., and achieve the effect of superior product performance, simple preparation process and stable process performance

Active Publication Date: 2016-11-09
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor toughness, high brittleness, and poor processability of silicon carbide ceramics, it is difficult to prepare parts with special shapes and integrated structures and functions. Generally, molding can only be used.
However, for the trial production of new products, the cost of mold processing required for complex products is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) In the grinder, add the following powders by mass percentage, 78 parts of silicon carbide powder with an average particle size of 0.25 μm, 7 parts of phenolic resin, 3 parts of carbon black, 4 parts of polyvinyl alcohol, and 8 parts of acetone. The speed of the grinder is 250r / min, grind for 4h, then carry out spray granulation and drying treatment, the inlet air temperature of the spray drying is 85°C, and obtain laser sintering rapid prototyping silicon carbide ceramic mixed powder;

[0032] (2) The 3D printing technology based on laser selective sintering is used to make the silicon carbide powder into a rough body, and the laser sintering procedure is: CO 2 Laser, the power is 25W, the powder coating thickness is 0.1mm, and the preheating temperature is 60°C;

[0033] (3) The rough body is subjected to reaction sintering. The specific process specification is: the rough body is buried in a mixed powder composed of silicon powder and boron nitride powder. The mas...

Embodiment 2

[0036] (1) In the grinder, add the following powders by mass percentage, 78 parts of silicon carbide powder with a particle size of 0.5 μm, 6 parts of phenolic resin, 2.5 parts of carbon black, 3.5 parts of polyvinyl alcohol, and 10 parts of acetone. The speed of the grinder is 250r / min, grind for 3h, then carry out spray granulation and drying treatment, the inlet air temperature of the spray drying is 85°C, and obtain laser sintering rapid prototyping silicon carbide ceramic mixed powder;

[0037] (2) The 3D printing technology based on laser selective sintering is used to make the silicon carbide powder into a rough body, and the laser sintering procedure is: CO 2 Laser, the power is 30W, the powder coating thickness is 0.2mm, and the preheating temperature is 60°C;

[0038] (3) The rough body is subjected to reaction sintering, and the specific process specification is: the rough body is buried in a mixed powder composed of silicon powder and boron nitride powder, and the ...

Embodiment 3

[0041] The preparation method of laser sintering rapid prototyping silicon carbide ceramics in this embodiment specifically includes the following steps:

[0042] (1) Preparation of laser sintering rapid prototyping silicon carbide ceramic powder;

[0043] (2) Using 3D printing technology based on laser selective sintering to make laser sintered rapid prototyping silicon carbide ceramic powder into a rough billet;

[0044] (3) Embedding the rough body in a mixed powder composed of silicon powder and boron nitride powder, and performing reaction sintering in a vacuum environment to obtain a sintered body;

[0045] (4) Soak the sintered body in an alkaline solution to remove excess metal silicon on the surface of the sintered body, and obtain the laser sintered rapid prototyping silicon carbide ceramic.

[0046] Wherein, in step (1), the preparation method of laser sintering rapid forming silicon carbide ceramic powder specifically comprises the following steps:

[0047] (1-1)...

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Abstract

The invention relates to a method for preparing laser sintering rapid prototyping type silicon carbide ceramics. The method comprises the steps of 1, preparing laser sintering rapid prototyping type silicon carbide ceramic powder; 2, making the laser sintering rapid prototyping type silicon carbide ceramic powder into a rough blank with the 3D printing technique based on selective laser sintering; 3, burying the rough blank in mixed powder formed by silica powder and boron nitride powder for reactive sintering in a vacuum environment, so that a sintering blank is obtained; 4, soaking the sintering blank in an alkaline solution to remove redundant metallic silicon on the surface of the sintering blank, so that the laser sintering rapid prototyping type silicon carbide ceramics are obtained. Compared with the prior art, the method has the advantages that a die is not needed, the process is simple, conditions are easy to control, and silicon carbide parts in various shapes can be manufactured. The method has unique advantages in small-lot special part manufacturing.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping materials, and relates to a preparation method of laser sintering rapid prototyping silicon carbide ceramics. Background technique [0002] Rapid prototyping technology is one of the advanced manufacturing technologies that have been highly valued and developed at a high speed in recent years. Its basic principles can be summarized as: layered manufacturing and layer-by-layer superposition, so it is sometimes called 3D printing technology. This type of technology receives layered data of product computer-aided design and uses laser selective sintering technology to directly form ceramic parts of various shapes without the need for mold forming. It is very useful for shortening the development cycle of new products and reducing development costs. Significance. [0003] Silicon carbide has low density, high hardness, good chemical stability, good thermal conductivity, and low thermal expa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/64C04B35/65C04B41/91B33Y10/00B33Y70/00B33Y80/00
CPCB33Y10/00B33Y70/00B33Y80/00C04B35/565C04B35/573C04B35/62615C04B35/62695C04B35/65C04B41/009C04B41/5353C04B41/91C04B2235/424C04B2235/665
Inventor 何金玲林文松刘浩
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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