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Preparation method of porous silicon nitride part with complicated shape

A technology of silicon nitride parts and complex shapes, applied in ceramic products, other household appliances, additive processing, etc., can solve problems affecting the performance stability of products, improve manufacturing efficiency and shape control ability, and is conducive to popularization and application , the effect of shortening the process flow and process cycle

Active Publication Date: 2018-05-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only needs to increase the degreasing process of polymers in the subsequent treatment, especially in the preparation process of large-scale ceramic parts, the photosensitive resin may be transformed into residual carbon due to incomplete cracking and other reasons, which will affect the stability of product performance

Method used

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  • Preparation method of porous silicon nitride part with complicated shape
  • Preparation method of porous silicon nitride part with complicated shape

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preparation example Construction

[0026] The preparation method of the complex-shaped porous silicon nitride part mainly includes the following steps:

[0027] Step 1, providing metal silicon powder and oxide sintering aids in predetermined mass fractions as raw materials. Specifically, the mass fraction of the metal silicon powder is 80-95 parts, and the mass fraction of the oxide sintering aid is 5-20 parts, that is, the metal silicon powder and the oxide sintering aid The mass ratio of the agent is (80-95): (5-20).

[0028] In this embodiment, the metal silicon powder is spherical silicon powder with an average particle size of 1 μm to 30 μm, and the weight percentage of impurities contained in it is less than 1%; the oxide sintering aid is iron oxide, ferrous oxide, oxide One or more of yttrium, lanthanum oxide, aluminum oxide, zirconium oxide and magnesium oxide, the particle size of the oxide sintering aid is 0.01 μm to 10 μm, and the weight percentage of impurities contained therein is less than 0.5%. ...

Embodiment 1

[0036] The preparation method of the complex-shaped porous silicon nitride part provided by the first embodiment of the present invention includes the following steps:

[0037] 11. Raw material preparation: prepare 80 parts by weight of silicon powder with a particle size of 1 μm, 10 parts of yttrium oxide powder with a particle size of 0.01 μm and 10 parts of alumina powder with a particle size of 0.01 μm. The above-mentioned yttrium oxide powder and alumina powder were weighed respectively, put into a ball mill jar, and mechanically ball milled to obtain a mixed powder. Wherein, the ball milling speed is 100 rpm, and the ball milling time is 4 hours.

[0038] 12. Additive manufacturing: Put the mixed powder into the feeding cylinder used in the laser additive manufacturing equipment, and after argon protection is passed into the working cabin, according to the model of the complex shape porous silicon nitride part to be formed The information spreads the mixed powder layer ...

Embodiment 2

[0041] The preparation method of the complex-shaped porous silicon nitride part provided by the second embodiment of the present invention mainly includes the following steps:

[0042] 21. Raw material preparation: Prepare 80 parts by weight of silicon powder with a particle size of 30 μm, 10 parts of iron oxide powder with a particle size of 0.1 μm and 10 parts of zirconia powder with a particle size of 0.1 μm, and mix the silicon powder, The iron oxide powder and zirconia powder are weighed respectively and put into a ball mill jar for mechanical ball milling to obtain mixed powder. Wherein, the ball milling speed is 100 rpm, and the ball milling time is 2 hours.

[0043] 22. Additive manufacturing: Put the mixed powder into the feeding cylinder used by the laser additive manufacturing equipment, and after passing through the argon gas protection in the working chamber, according to the model of the complex shape porous silicon nitride part to be formed Information Spread t...

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Abstract

The invention belongs to the technical field of material molding, and discloses a preparation method of a porous silicon nitride part with a complicated shape. The method combines a metal selective laser melting process with a silicon nitride reaction sintering process, and provides a novel idea for preparing the porous silicon nitride part with a large size and complicated shape; and the method specifically comprises the following steps: (1) providing metal silicon powder and an oxide sintering auxiliary agent according to predetermined mass parts to be used as raw materials; (2) performing micro-area partial sintering on the raw materials by adopting the selective laser melting process to preform a porous silicon green body; and (3) performing reaction sintering on the porous silicon green body, and performing nitriding to obtain the porous silicon nitride part with the complicated shape. According to the preparation method provided by the invention, shape and performance control tothe porous silicon nitride part is easy to realize, the production efficiency can be improved, the flexibility is higher, and a polymer binder is not needed.

Description

technical field [0001] The invention belongs to the technical field related to material forming, and more specifically relates to a preparation method of a complex-shaped porous silicon nitride part. Background technique [0002] For a long time, the preparation of porous silicon nitride ceramic parts with complex shapes has been one of the problems restricting the engineering application of porous silicon nitride ceramics. The molding process of various silicon nitride ceramics with complex shapes such as direct solidification injection molding. Although these methods can produce complex shapes, they all rely on the manufacture of molds. Due to the long manufacturing cycle and high cost of the mold itself, the manufacturing cycle and cost of porous silicon nitride parts with complex shapes are also increased, especially for the preparation of small batches and large complex shapes. In recent years, the development of additive manufacturing technology has enabled the prepa...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/65C04B38/00B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00C04B35/591C04B35/622C04B38/0041C04B2235/3206C04B2235/3225C04B2235/3227C04B2235/3244C04B2235/3272C04B2235/658C04B2235/96C04B38/0074C04B38/0054
Inventor 史玉升刘荣臻吴甲民陈双陈安南李晨辉陈鹏
Owner HUAZHONG UNIV OF SCI & TECH
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