Method for preparing silicon nitride ceramics through 3D printing

A silicon nitride ceramic, 3D printing technology, applied in the field of 3D printing, can solve the problems of low applicability, high cost, inability to prepare silicon nitride parts, etc., and achieve the effect of reducing cost, improving material performance and excellent reliability.

Active Publication Date: 2018-01-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing texturing method cannot prepare silicon nitride parts with complex shapes, and the cos

Method used

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  • Method for preparing silicon nitride ceramics through 3D printing
  • Method for preparing silicon nitride ceramics through 3D printing
  • Method for preparing silicon nitride ceramics through 3D printing

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Experimental program
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preparation example Construction

[0035] A) preparation of slurry:

[0036] After mixing and drying the α-phase silicon nitride powder, the β-phase silicon nitride powder and the sintering aid, crushing and sieving to obtain a mixed powder;

[0037] mixing the mixed powder, photocurable resin, photoinitiator and dispersant to obtain a slurry;

[0038] B) Forming:

[0039] b1) The 3D model of the part is input into the computer, and the software is used for slicing to obtain single-layer printing data;

[0040] b2) Using a scraper to obtain a flat single-layer curing plane, controlling the movement of the platform through a computer, and selectively curing the slurry plane with a curing light source to obtain a single-layer curing shape;

[0041] b3) repeating step b2) on the surface of the single-layer solidified shape, and stacking layer by layer to obtain a green body of the desired shape;

[0042] The scraper is a double-layer scraper structure, the first layer of scraper is a toothed scraper, and the se...

Embodiment 1

[0080] The first step slurry preparation:

[0081] The weight share of each component described in the step (a1) is: 90 grams of α-phase silicon nitride powder, 5 grams each of aluminum oxide and yttrium oxide as sintering aids. The components were mixed in ethanol, the pH value was adjusted to 11, ball milled for 10 hours at a rotational speed of 350 r / min, and ultrasonically dispersed.

[0082] Step (a2) Add 5 grams of β-phase silicon nitride powder to the slurry described in step (a1), ball mill for 1 hour, and perform ultrasonic dispersion. After the slurry is dried by rotary evaporation, it is pulverized and sieved to obtain a uniformly dispersed mixed powder. The SEM image of the β-phase silicon nitride powder is shown in image 3 , image 3 It is the SEM image of β-phase silicon nitride powder. Wherein, the diameter of the β-phase silicon nitride is 0.2-1.5 μm, and the aspect ratio is (1-10):1.

[0083] Step (a3) ​​mix the powder and 70 grams of photosensitive resi...

Embodiment 2

[0098] The first step slurry preparation:

[0099] The weight share of each component described in the step (a1) is: 50 grams of α-phase silicon nitride powder, 5 grams of alumina and 5 grams of yttrium oxide as sintering aids. The components were mixed in ethanol, the pH value was adjusted to 11, ball milled for 10 hours at a rotational speed of 350 r / min, and ultrasonically dispersed.

[0100] Step (a2) Add 50 grams of β-phase silicon nitride powder to the slurry described in step (a1), ball mill for 1 hour, and perform ultrasonic dispersion. After the slurry is dried by rotary evaporation, it is pulverized and sieved to obtain a uniformly dispersed mixed powder.

[0101] Step (a3) ​​mix the powder and photosensitive resin 65 grams (pentaerythritol tetraacrylate 20wt%, 1,6-hexanediol diacrylate 15wt%, polyurethane acrylate 20wt%, n-octanol 25wt%, polyethylene Diol-300 20wt%), 0.7 g of photoinitiator (BASF 819) and 1 g of dispersant (BYK9077) were mixed and ball milled for ...

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Abstract

The invention provides a method for preparing silicon nitride ceramics through 3D printing. With the adoption of a 3D printing technology, silicon nitride ceramic parts of complicated shapes can be prepared, and a double-layer scraper molding technology in the printing process is utilized, so that beta phase silicon nitride is in oriented arrangement, and after degumming and sintering, the structured silicon nitride ceramics with complicated shapes can be obtained. The prepared silicon nitride parts have excellent reliability, mechanical properties, thermal properties, wear resistance and thelike. The invention provides a novel preparation method, and the molding problem of the silicon nitride ceramics is solved. Moreover, the material performance is improved, and the cost is reduced. According to the preparation method provided by the invention, application of the silicon nitride ceramics in the fields of medical treatment, chemical industry, electronics, aerospace and the like can be promoted.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a method for 3D printing silicon nitride ceramics. Background technique [0002] Silicon nitride ceramics is a kind of engineering ceramics with great application potential. Its excellent mechanical properties, biocompatibility, high temperature performance, corrosion resistance and high wear resistance make it play a unique role in the industrial field. With the development of raw material preparation, sintering, molding and processing technology, the application field of silicon nitride ceramics has gradually expanded, and now it is mainly used in the application of electronic devices, machining, metal smelting, artificial bones and other industries. [0003] At present, silicon nitride parts with complex shapes are mainly prepared by machining, isostatic pressing, gel injection molding, injection molding and other methods. However, its processing cost is extre...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/632C04B35/634C04B35/638C04B35/64B33Y10/00
Inventor 伍尚华蒋强国黄容基吴子薇伍海东朱祖云王博邓欣
Owner GUANGDONG UNIV OF TECH
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