Stereolithography-based method for preparing silicon nitride ceramic by 3D printing

A technology of silicon nitride ceramic powder and photoinitiator, which is applied in the field of 3D printing, can solve the problems of high preparation cost, uneven finished product, poor product size accuracy, etc.

Inactive Publication Date: 2017-05-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing silicon nitride ceramics by 3D printing based on light-curing molding, which is used to solve the main problems of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] Step 1: prepare slurry

[0035] 40 g of silicon nitride ceramic powder, 0.2 g of dispersant and 120 g of ethanol were mixed, and dried at 60° C. after the first ball milling to obtain powder 1. In this embodiment, the ball milling medium of the first ball milling is silicon nitride, the shape of the ball milling medium of the first ball milling is spherical, the diameter of the ball milling medium of the first ball milling is 1mm, and the material-to-ball ratio of the first ball milling is 1. :1.

[0036] 60g monomer, 0.2g dispersant and 1g defoamer are mixed to obtain premix 1.

[0037] Premix liquid 1, powder 1 and 0.4g surface modifier are mixed, ball milled for the second time, and initial slurry 1 is obtained. In this embodiment, the ball milling medium of the second ball milling is silicon nitride, the shape of the ball milling medium of the second ball milling is spherical, the diameter of the ball milling medium of the second ball milling is 3mm, an...

Example Embodiment

[0046] Example 2

[0047] Step 1: prepare slurry

[0048] 45 g of silicon nitride ceramic powder, 0.45 g of dispersant and 135 g of ethanol were mixed, and dried at 60° C. after the first ball milling to obtain powder 2. In this embodiment, the ball milling medium of the first ball milling is silicon nitride, the shape of the ball milling medium of the first ball milling is spherical, the diameter of the ball milling medium of the first ball milling is 3mm, and the material-to-ball ratio of the first ball milling is 2 :1.

[0049] 55g monomer, 0.2g dispersant and 0.2g defoamer are mixed to obtain premix liquid 2.

[0050] Premix liquid 2, powder 2 and 0.2g surface modifier are mixed, ball milled for the second time to obtain primary slurry 2. In this embodiment, the ball milling medium of the second ball milling is silicon nitride, the shape of the ball milling medium of the second ball milling is spherical, the diameter of the ball milling medium of the second ball milling is 3mm, ...

Example Embodiment

[0059] Example 3

[0060] Step 1: prepare slurry

[0061] 50g of silicon nitride ceramic powder, 0.5g of dispersant and 150g of ethanol were mixed, and dried at 60°C after the first ball milling to obtain powder 3. In this embodiment, the ball milling medium of the first ball milling is silicon nitride, the shape of the ball milling medium of the first ball milling is spherical, the diameter of the ball milling medium of the first ball milling is 5mm, and the material-to-ball ratio of the first ball milling is 3. :1.

[0062] 50g monomer, 0.5g dispersant and 0.5g defoamer are mixed to obtain premix 3.

[0063] Premix liquid 3, powder 3 and 0.5 g of surface modifier are mixed, ball milled for the second time, and initial slurry 3 is obtained. In this embodiment, the ball milling medium of the second ball milling is silicon nitride, the shape of the ball milling medium of the second ball milling is spherical, the diameter of the ball milling medium of the second ball milling is 5mm, a...

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Abstract

The invention belongs to the technical field of 3D printing, and particularly relates to a stereolithography-based method for preparing silicon nitride ceramic by 3D printing. The invention provides a composition which is prepared from silicon nitride ceramic powder, monomers, a photoinitiator, a dispersing agent, a surface modifier and a defoaming agent. The invention also provides a preparation method of the silicon nitride ceramic from the composition. In the technical scheme provided by the invention, the raw material selection and proportioning are optimized, so that the method is more suitable for producing silicon nitride ceramic. The prepared silicon nitride ceramic product has the advantages of uniform ceramic particle dispersion, high dimensional accuracy, favorable surface smoothness and higher reliability; and the method has the advantage of high preparation efficiency, and effectively lowers the time cost and manpower cost. The technical scheme provided by the invention overcomes the main technical defects of nonuniform finished product, poor sintered product dimensional accuracy and high preparation cost in the silicon nitride ceramic billet in the prior art.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a method for preparing silicon nitride ceramics by 3D printing based on light-curing molding. Background technique [0002] Silicon nitride ceramic components are widely used in the fields of machinery, chemical industry and automobiles, such as silicon nitride ceramic gears, turbine rotors, cutting tools and bearings. At present, the forming methods of silicon nitride ceramic parts include: cold isostatic pressing, dry pressing, grouting and hot die casting. Among them, although the dry pressing method has high efficiency, the formed products have problems of density difference and uneven microstructure, and it is not easy to form complex shapes and special-shaped products; the cold isostatic pressing method can obtain high density and high uniformity. However, it is still difficult to form ceramic parts with complex shapes, and the molding efficiency is low and...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/626C04B35/634C04B35/632B33Y70/00B28B1/00B33Y10/00
CPCC04B35/584B28B1/001B33Y10/00B33Y70/00C04B35/622C04B35/6261C04B35/6264C04B35/632C04B35/63424C04B2235/5445C04B2235/5454C04B2235/60C04B2235/963
Inventor 刘伟伍海东伍尚华吴子薇蒋强国李炼
Owner GUANGDONG UNIV OF TECH
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