Preparation method of silicon nitride ceramic

A technology of silicon nitride ceramics, -si3n4, applied in the field of preparation of silicon nitride ceramics, can solve the problems of difficulty in realizing industrialization, high cost, low self-diffusion coefficient, etc., and achieve easy industrial production, excellent performance, widen Effects in the field of application

Inactive Publication Date: 2009-10-14
SHANDONG GUIYUAN ADVANCED CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since silicon nitride is a strong covalent bond compound, the self-diffusion coefficient is very low, and only when the sintering temperature is close to the decomposition temperature of silicon nitride, can there be sufficient ion migration speed, so it is difficult to obtain dense silicon nitride ceramics by solid phase sintering
Therefore, oxide sintering aids are often added, which react with the silicon dioxide and silicon nitride on the surface at high temperatures to form oxynitride liquid phases to promote sintering, but the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] The preparation method of the silicon nitride ceramic of the present invention includes batching, forming and firing, and the batching weight is divided into 100 groups:

[0022] α-Si 3 N 4 Pink 85%, AL 2 O 3 10%, ZrO 2 4% and Y 2 O 3 1%.

[0023] among them:

[0024] α-Si 3 N 4 The content of the α phase in the product is 90%.

[0025] The particle size of the ingredients is separately controlled as: α-Si 3 N 4 2-30μm, AL 2 O 3 1-3μm, ZrO 2 0.5-1μm and Y 2 O 3 1-2μm.

[0026] After mixing the ingredients by ball milling with water as the medium, add 1.0% polyvinyl alcohol and mix for 2 hours to obtain the slurry, dry and granulate, and control the granulation between 60-120 mesh sieve and isostatic pressure under 150Mpa pressure The green body is formed, and after drying, it is fired at a temperature of 1650°C under the protection of a nitrogen atmosphere, and the temperature is kept for 3 hours.

[0027] The obtained technical indicators of silicon nitr...

Example Embodiment

[0028] Example 2

[0029] The preparation method of the silicon nitride ceramic of the present invention includes batching, forming and firing, and the batching weight is divided into 100 groups:

[0030] α-Si 3 N 4 Powder 86%, AL 2 O 3 8%, ZrO 2 4% and Y 2 O 3 2%.

[0031] among them:

[0032] α-Si 3 N 4 The α-phase content in the bismuth is 89%.

[0033] The particle size of the ingredients is separately controlled as: α-Si 3 N 4 2-30μm, AL 2 O 3 1-3μm, ZrO 2 0.5-1μm and Y 2 O 3 1-2μm.

[0034] After the ingredients are uniformly mixed by ball milling with water as the medium, 1.1% polyvinyl alcohol is added and mixed for 2.5 hours to obtain slurry, dried and granulated, and the granulation is controlled between 60-120 mesh sieve and isostatic pressure under 150Mpa pressure The green body is formed, dried and fired at a temperature of 1700°C under the protection of a nitrogen atmosphere, and kept for 3 hours.

[0035] The obtained technical indicators of silicon nitride ceramic ...

Example Embodiment

[0036] Example 3

[0037] The preparation method of the silicon nitride ceramic of the present invention includes batching, forming and firing, and the batching weight is divided into 100 groups:

[0038] α-Si 3 N 4 Powder 88%, AL 2 O 3 6%, ZrO 2 5% and Y 2 O 3 1%.

[0039] among them:

[0040] α-Si 3 N 4 The α-phase content in the slab is 92%.

[0041] The particle size of the ingredients is separately controlled as: α-Si 3 N 4 2-30μm, AL 2 O 3 1-3μm, ZrO 2 0.5-1μm and Y 2 O 3 1-2μm.

[0042] After the ingredients are uniformly mixed by ball milling with water as the medium, 1.2% polyvinyl alcohol is added and mixed for 2 hours to obtain the slurry, dried and granulated, and the granulation is controlled between 60-120 mesh sieve and isostatic pressure under 160Mpa pressure The green body is formed, dried, and fired at a temperature of 1720°C under the protection of a nitrogen atmosphere, and kept for 4 hours.

[0043] The obtained technical indicators of silicon nitride ceramic ...

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Abstract

The invention relates to a preparation method of a silicon nitride ceramic, which belongs to the technical field of the special ceramic. The method comprises the following steps of blending, molding and burning and is characterized in that the silicon nitride ceramic comprises the following components of 82-88 percent of alpha-Si3N4 powder, 5-10 percent of AL2O3, 3-6 percent of ZrO2 and 1-3 percent of Y2O3 by weight; the components are evenly mixed by ball milling by taking water as the medium, then the polyvinyl alcohol with 0.8-1.2 percent of the total component weight is added in for mixing for 1-5-3 hours to obtain pulp, the pulp is dried for granulation, and the isostatic compaction is performed at the pressure of 110-180 MPa to obtain blank; the blank is loaded in a nitriding furnace and is protected in the nitrogen atmosphere, and the burnt temperature is controlled between 1550-1720 DEG C. The invention is low in cost, is easy for realization of the industrialization production and extends the application range.

Description

technical field [0001] The invention relates to a method for preparing silicon nitride ceramics, which belongs to the field of special ceramic bases. Background technique [0002] As a high-temperature structural ceramic, silicon nitride ceramics have excellent performance, and have special use value in high-temperature, high-speed, and strong corrosive media. growing. [0003] Since silicon nitride is a strong covalent bond compound, the self-diffusion coefficient is very low, and only when the sintering temperature is close to the decomposition temperature of silicon nitride, there is sufficient ion migration speed, so it is difficult to obtain dense silicon nitride ceramics by solid phase sintering . Therefore, oxide sintering aids are often added, which react with the silicon dioxide and silicon nitride on the surface at high temperatures to form oxynitride liquid phases to promote sintering, but these liquid phases often form amorphous glass phases or crystals during ...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/584C04B35/64
Inventor 高礼文樊震坤许业静刘天程范勇刘宝英刘德军
Owner SHANDONG GUIYUAN ADVANCED CERAMICS
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