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A kind of silicon nitride ceramic and preparation method thereof

A technology of silicon nitride ceramics and silicon nitride powder, applied in the field of 3D printing, can solve problems such as poor printing, a large number of pores, and incomplete coating, and achieve the effect of improving feasibility, simple operation, and broadening the application field.

Active Publication Date: 2021-08-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention discloses a silicon nitride ceramic and its preparation method, which can effectively solve the technical defects of incomplete coating, a large number of pores after degreasing, or poor printing existing in the current 3D printing molding technology.

Method used

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  • A kind of silicon nitride ceramic and preparation method thereof
  • A kind of silicon nitride ceramic and preparation method thereof

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preparation example Construction

[0030] The invention provides a method for preparing silicon nitride ceramics, comprising the following steps:

[0031] Step 1, mixing silicon nitride powder, sintering aid, photosensitive resin, dispersant and photoinitiator to obtain silicon nitride ceramic slurry;

[0032] Step 2, performing photocuring molding on the silicon nitride ceramic slurry to obtain a silicon nitride ceramic body;

[0033] Step 3, cleaning and solidifying the silicon nitride ceramic body to obtain a solidified silicon nitride ceramic body;

[0034] Step 4, degreasing the solidified silicon nitride ceramic body to obtain a degreased silicon nitride ceramic body;

[0035] Step 5, performing precursor impregnation treatment on the degreased silicon nitride ceramic body, including the following steps:

[0036] Step a, removing the air from the degreased silicon nitride ceramic body to obtain the first silicon nitride ceramic body;

[0037] Step b, soaking the first silicon nitride ceramic body in th...

Embodiment 1

[0059] The embodiment of the present invention provides the first method for preparing silicon nitride ceramics, the steps of which are as follows:

[0060] (1) 50g silicon nitride powder, 5g sintering aid, 50g photosensitive resin, 0.5g dispersant and 0.5g photoinitiator are mixed to obtain a uniformly dispersed silicon nitride ceramic slurry; the sintering aid is alumina, The photosensitive resin is 1,6-hexanediol diacrylate, and the photoinitiator is (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO).

[0061] (2) Import the three-dimensional image of the model into the light-curing molding equipment to convert the data, slice it into a series of two-dimensional images, and then add the silicon nitride ceramic slurry prepared in (1) to the molding equipment. According to the single-layer image of the slice, The light source selectively solidifies the paste planes, obtaining a monolayer shape. Then stack them layer by layer to obtain a silicon nitride ceramic body.

[0...

Embodiment 2

[0071] The embodiment of the present invention provides a second method for preparing silicon nitride ceramics, the steps of which are as follows:

[0072] (1) Mix 50g of silicon nitride powder, 10g of sintering aid, 25g of photosensitive resin, 0.5g of dispersant and 0.5g of photoinitiator to obtain a uniformly dispersed silicon nitride ceramic slurry; the sintering aid is alumina, The photosensitive resin is 1,6-hexanediol diacrylate, and the photoinitiator is (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO).

[0073] (2) Import the three-dimensional image of the model into the light-curing molding equipment to convert the data, slice it into a series of two-dimensional images, and then add the silicon nitride ceramic slurry prepared in (1) to the molding equipment. According to the single-layer image of the slice, The light source selectively solidifies the paste planes, obtaining a monolayer shape. Then stack them layer by layer to obtain a silicon nitride ceramic bo...

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Abstract

The invention belongs to the technical field of 3D printing, and in particular relates to a silicon nitride ceramic and a preparation method thereof. The silicon nitride ceramic and its preparation method disclosed by the invention can effectively solve the technical defects of a large number of pores after degreasing or poor printing existing in the current 3D printing molding technology. The invention provides a method for preparing silicon nitride ceramics, comprising the following steps: preparing silicon nitride ceramic slurry; printing and forming; post-forming treatment; degreasing; impregnating a precursor; and obtaining silicon nitride ceramic parts after sintering.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a silicon nitride ceramic and a preparation method thereof. Background technique [0002] Silicon nitride ceramics are one of the most promising high-temperature structural ceramics, which play an important role in aerospace, automotive engines and other fields. However, traditional processing methods are increasingly unable to meet the requirements of field expansion, and it is difficult to produce high-performance complex structural parts efficiently, quickly, and at low cost. For this reason, the 3D printing molding technology proposed in the 1920s began to come into people's sight, and many 3D printing technologies were gradually introduced into the field of manufacturing. At present, the commonly used rapid prototyping methods of ceramics are: three-dimensional printing prototyping (3DP), selective laser melting (SLM) and stereolithography (SLA). However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/638C04B35/64B33Y10/00
CPCB33Y10/00C04B35/584C04B35/622C04B35/638C04B35/64C04B2235/6026C04B2235/6562C04B2235/6567C04B2235/658C04B2235/661C04B2235/96
Inventor 伍尚华黄容基伍海东蒋强国黎业华
Owner GUANGDONG UNIV OF TECH