Preparation method and application of high-thermal-conductivity silicon nitride ceramic cast film

A technology for silicon nitride ceramics and casting films, which is applied in the field of silicon nitride ceramics casting and molding, can solve the problems of inability to improve production efficiency and long time.

Active Publication Date: 2021-07-23
SINOMA ADVANCED NITRIDE CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the traditional tape casting process of secondary ball milling takes a long time and cannot improve production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The invention provides a preparation method and application of a high thermal conductivity silicon nitride ceramic cast film, comprising the following steps:

[0032] Mixing silicon nitride and Y-Mg sintering aids to obtain a mixture;

[0033] Stir the dispersant, stabilizer, ethanol and the mixture homogeneously to obtain the first slurry; the rotational speed of the homogeneous stirring is 2000-4000r / min, and the time is 2h;

[0034] mixing polyvinyl alcohol with an organic solvent to obtain a binder; the organic solvent includes ethanol, but also methyl ethyl ketone or ethyl acetate;

[0035] Mix the first slurry, binder and plasticizer, and perform a ball mill to obtain the second slurry; the viscosity of the second slurry is 2500-4000cps, the pH value is 8.0-9.0, and the solid content is 48.5 to 54.1%; the speed of the primary ball mill is 150r / min, and the time is 24h;

[0036] The second slurry is sequentially tape-cast to obtain a high thermal conductivity sil...

Embodiment 1

[0079] 870g silicon nitride raw powder (oxygen content ≤ 1%, impurity content ≤ 0.2%, average particle size D 50 2 o 3 and 60g MgSiN 2 Stir in a dry powder mixer for 4h to obtain a mixture;

[0080] In the homogeneous disperser, after adding 15g of triethyl phosphate, 80g of ethanol, 450g of methyl acetate and the mixture, homogeneously stirred for 2 hours to obtain the first slurry;

[0081] After adding 110g of polyvinyl alcohol into the insulation tank, add 250g of methyl ethyl ketone and 250g of ethanol, stir until completely dissolved, and obtain the binder;

[0082] In the nylon ball mill jar, add the binding agent, 80g polyethylene glycol and the first slurry, and carry out ball milling, wherein the rotating speed of the ball milling is 150r / min, and the time is 24h, adding a total of 1600g silicon nitride grinding balls (including mass The ratio is 3:4:3 with Silicon nitride grinding balls), vacuum defoaming, to obtain the second slurry (the viscosity of the sec...

Embodiment 2

[0087] 900g silicon nitride raw powder (oxygen content ≤ 1%, impurity content ≤ 0.2%, average particle size D 50 2 o 3 Stir 4h with 50g MgO in dry powder mixer, obtain mixture;

[0088] In the homogeneous disperser, after adding 10g of castor oil, 50g of ethanol, 400g of ethyl acetate and the mixture, homogeneously stirred for 2h to obtain the first slurry;

[0089] After adding 90g of polyvinyl alcohol into the binder tank, add 150g of ethyl acetate and 100g of ethanol, and stir until completely dissolved to obtain the binder;

[0090] In the nylon ball mill tank, add the binder, 50g diethyl phthalate and the first slurry, and carry out ball milling, wherein the ball milling speed is 150r / min, and the time is 24h, adding a total of 1600g silicon nitride for grinding Balls (including those with a mass ratio of 3:4:3 with silicon nitride grinding balls), vacuum defoaming to obtain the second slurry (the viscosity of the second slurry is 3700cps, the pH value is 8.4, and t...

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Abstract

The invention relates to the technical field of silicon nitride ceramic casting, in particular to a preparation method and application of a high-thermal-conductivity silicon nitride ceramic cast film. By controlling the composition, the solid content and the viscosity of the second slurry, the dispersion effect which is the same as that of secondary ball milling in the prior art can be achieved only through homogeneous stirring and primary ball milling, the time is short, the efficiency is high, meanwhile, a tape casting biscuit lamination process in the process of preparing a ceramic substrate from the high-thermal-conductivity silicon nitride ceramic tape casting film is omitted, and the batch production requirement is met.

Description

technical field [0001] The invention relates to the technical field of casting silicon nitride ceramics, in particular to a preparation method and application of a casting film of silicon nitride ceramics with high thermal conductivity. Background technique [0002] Compared with forming methods such as dry pressing, film rolling, and cutting, the preparation of silicon nitride ceramic substrates by tape casting technology can not only achieve continuous production and meet the requirements for product specifications, but also realize the process characteristics of silicon nitride. Oriented arrangement of crystal grains to improve the thermal conductivity of the product is currently known as the most suitable molding method for batch production of high thermal conductivity silicon nitride ceramic substrates. However, at present, most of the tape casting processes basically use the secondary ball milling method to prepare the slurry, such as Zhang Jingxian et al. 2017-05, 16...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/596C04B35/626
CPCC04B35/587C04B35/6261C04B35/6263C04B2235/3225C04B2235/3206C04B2235/3873C04B2235/3852C04B2235/9607
Inventor 张伟儒荆赫吕沛远梁盼盼张晶袁磊孙峰徐学敏董廷霞杨厚萌
Owner SINOMA ADVANCED NITRIDE CERAMICS CO LTD
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