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Silicon nitride ceramic slurry, silicon nitride ceramic and preparation method and application thereof

A technology of silicon nitride ceramics and silicon nitride powder, which is applied in the field of ceramic materials, can solve the problems of limiting light-curing molding technology and the development of silicon nitride ceramics, low single-layer curing depth, and scattering of silicon nitride ceramics, etc., to achieve reduction Exposure time, low cost, effect of promoting sintering densification

Active Publication Date: 2018-10-19
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this technology requires a silicon nitride ceramic slurry with a high solid content to obtain a sintered dense body
However, some scholars have pointed out that there are the following problems in the molding of silicon nitride slurry: (1) the solid phase content of silicon nitride ceramic slurry is low (about 30vol%); (2) higher exposure time is required in the molding process , the solidification depth of the single layer obtained is low; (3) Since the refractive index n of silicon nitride is 2.2, the refractive index n of the resin medium is 1.4, and its high refractive index will cause a large scattering
These three main problems limit the development of light-curing molding technology and the application of silicon nitride ceramics

Method used

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  • Silicon nitride ceramic slurry, silicon nitride ceramic and preparation method and application thereof
  • Silicon nitride ceramic slurry, silicon nitride ceramic and preparation method and application thereof
  • Silicon nitride ceramic slurry, silicon nitride ceramic and preparation method and application thereof

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preparation example Construction

[0030] The invention provides a specific embodiment of the preparation method of silicon nitride ceramic slurry, and its preparation steps are as follows:

[0031] (1) Powder preparation: Put the silicon nitride powder into an air sintering furnace for oxidation treatment to obtain thermally oxidized silicon nitride powder;

[0032] (2) Powder mixing: after mixing the thermal oxidized silicon nitride powder obtained in (1) and the sintering aid powder, drying to obtain a dry powder;

[0033] (3) Slurry preparation: mix the dry powder in (2) with resin, dispersant, defoamer and photoinitiator to obtain silicon nitride ceramic slurry.

[0034] Specifically, the mixing is ball milling.

[0035] Specifically, the drying condition is drying at 60° C. for 24 hours.

[0036] Specifically, step (1) is dried and passed through a 100-mesh sieve to obtain a dry powder.

[0037] Specifically, the particle size of the thermally oxidized silicon nitride powder is 0.2-1 μm.

[0038] Spec...

Embodiment 1

[0063] The embodiment of the present invention provides the first kind of preparation method of silicon nitride ceramic slurry, and its steps are as follows:

[0064] (1) Powder preparation: put silicon nitride powder with a particle size of 0.2 μm into an air sintering furnace, raise the temperature to 1150°C at a heating rate of 5°C / min, and keep it for 2 hours to obtain thermally oxidized silicon nitride powder , to detect the SiO of the thermally oxidized silicon nitride powder of this embodiment 2 Proportions, the results are shown in Table 1;

[0065] (2) Powder mixing: 50g of thermal oxidized silicon nitride powder and 4g of Y 2 o 3 Mix by ball milling for 8 hours, dry at 60°C for 24 hours, and pass through a 100-mesh sieve to obtain a uniformly mixed dry powder;

[0066] (3) Slurry preparation: 40g of dry powder, 8.5g of 1,6-hexanediol diacrylate (HDDA), 8.5g of pentaerythritol tetraacrylate (PETTA), 0.4g of BYK-9077, 0.6 g of BYK-057 and 0.26 g of phenylbis(2,4,6-...

Embodiment 2

[0074] The embodiment of the present invention provides a second method for preparing silicon nitride ceramic slurry, the steps of which are as follows:

[0075] (1) Powder preparation: Put the silicon nitride powder with a particle size of 0.7 μm into an air sintering furnace, raise the temperature to 1300°C at a heating rate of 10°C / min, and keep it for 1h to obtain a thermally oxidized silicon nitride powder ;

[0076] (2) Powder mixing: 50g of thermally oxidized silicon nitride powder and 5g of La 2 o 3 Mix by ball milling for 8 hours, dry at 60°C for 24 hours, and pass through a 100-mesh sieve to obtain a uniformly mixed dry powder;

[0077] (3) Slurry preparation: 40g of dry powder, 8.5g of 1,6-hexanediol diacrylate (HDDA), 8.5g of trimethylolpropane triacrylate (TMPTA), 0.4g of BYK -163, 0.8g BYK-057, and 0.3g of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO) were uniformly mixed to obtain a silicon nitride ceramic slurry.

[0078] The embodiment of the prese...

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Abstract

The invention belongs to the technical field of ceramic materials, and particularly relates to silicon nitride ceramic slurry, silicon nitride ceramic and a preparation method and application thereof.The preparation method for the silicon nitride ceramic slurry provided by the invention comprises the following steps: step one, heating silicon nitride powder, to obtain thermal-oxidized silicon nitride powder; step two, mixing the thermal-oxidized silicon nitride powder and a sintering aid, and drying, to obtain dry powder; step three, enabling the dry powder to mix with a resin, a dispersing agent, a defoaming agent and a photoinitiator, to obtain the silicon nitride ceramic slurry. The advantage of the preparation method is that the surface oxidation treatment cost of the silicon nitridepowder is low, the solid content of the silicon nitride ceramic slurry is apparently improved, a scattering phenomenon of the silicon nitride ceramic slurry in a photocuring forming process is reduced, the needed exposure time of the silicon nitride ceramic slurry in the photocuring forming process is reduced, a forming efficiency is improved, and the thermal-oxidized silicon nitride powder can promote sintering densification and improve ceramic performance.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a silicon nitride ceramic slurry, a silicon nitride ceramic and a preparation method and application thereof. Background technique [0002] Silicon nitride ceramics have excellent high temperature performance, chemical stability, and mechanical properties, and have been widely concerned by people. With the development of aerospace, industry and other fields, the application requirements of silicon nitride ceramics are constantly increasing. In addition to meeting the performance requirements, it is also necessary to meet the structural shape requirements of the ceramic components in the application. The traditional molding method is to mold powder or powder-containing slurry, obtain ceramic components through post-processing such as sintering, and then obtain ceramic parts that meet the requirements through micro-processing. This method of mold forming cann...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/638C04B35/64
CPCC04B35/584C04B35/622C04B35/638C04B35/64C04B2235/6562C04B2235/6567
Inventor 伍尚华黄容基蒋强国伍海东刘文勇
Owner GUANGDONG UNIV OF TECH
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