Ceramics of containing powder body of cubic silicon nitride, and preparation method

The technology of cubic silicon nitride powder and cubic silicon nitride is applied in the field of ceramics containing cubic silicon nitride powder and its preparation, which can solve the problems of inapplicability and achieve high density, uniform microstructure and mechanical properties. excellent effect

Inactive Publication Date: 2007-10-10
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, traditional ceramic sintering technology is not suitable for γ-Si 3 N 4 of sintering, developed to contain γ-Si 3 N 4 New sintering technology of powder ceramics for the development and utilization of γ-Si 3 N 4 The performance of ceramics is of great significance

Method used

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  • Ceramics of containing powder body of cubic silicon nitride, and preparation method
  • Ceramics of containing powder body of cubic silicon nitride, and preparation method
  • Ceramics of containing powder body of cubic silicon nitride, and preparation method

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1: see accompanying drawing 1-4.

[0034] A preparation method of ceramics containing cubic silicon nitride powder, comprising the following steps:

[0035] a. Grinding of ingredients: according to γ-Si 3 N 4 25% (average particle size 30nm), α-Si 3 N 4 70% (200 mesh), sintering aid (both 200 mesh) Y 2 o 3 1%, Al 2 o 3 2%, La 2 After the weight percent example of 0.2% is measured and compounded respectively, the grinding medium is mixed and ground with absolute ethanol for 4 hours to obtain a uniformly dispersed composite powder;

[0036] b. Drying: Dry the ground composite powder in an infrared drying oven (power 500W) for 10 minutes;

[0037] c. Cold isostatic pressing granulation: Press the dried composite powder under the pressure of 250MPa by cold isostatic pressing, take it out and crush it, and pass it through a 1-3mm square hole sieve to obtain uniform granules;

[0038] d, dry pressing molding: pass the granulated particles through a steel ...

Embodiment 2

[0050] Embodiment 2: see accompanying drawing 1,5~7.

[0051] A preparation method of ceramics containing cubic silicon nitride powder, comprising the following steps:

[0052] a. Grinding of ingredients: according to γ-Si 3 N 4 95% (average particle size 30nm), sintering aid (both 200 mesh) Y 2 o 3 1%, Al 2 o 3 2%, La 2 After the weight percent example of 0.2% is measured and compounded respectively, the grinding medium is mixed and ground with absolute ethanol for 4 hours to obtain a uniformly dispersed composite powder;

[0053] b. Drying: Dry the ground composite powder in an infrared drying oven (power 500W) for 10 minutes; control the temperature within 120°C;

[0054] c. Cold isostatic pressing granulation: Press the dried composite powder under the pressure of 250MPa by cold isostatic pressing, take it out and crush it, and pass it through a 1-3mm square hole sieve to obtain uniform granules;

[0055] d, dry pressing molding: pass the granulated particles throu...

Embodiment 3-9

[0063] A kind of pottery containing cubic silicon nitride powder body, the weight percent example composition of this pottery is shown in the following table respectively:

[0064]

[0065] γ-Si mentioned in the table 3 N 4 The particle size is submicron to nanometer; the Al 2 o 3 , ZrO 2 , α or β phase Si 3 N 4 , SiC, BN or AlN have a particle size of tens of microns to submicrons; the sintering aid Y 2 o 3 、Al 2 o 3 , La 2 The particle size of O is tens of micrometers to submicrometers.

[0066] The preparation method of the ceramics containing cubic silicon nitride powder in each embodiment in the table is the same as that of Example 1 or 2, or the steps, conditions and parameters of the process described in the content of the present invention, omitted.

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Abstract

This invention discloses a ceramic containing cubic nitride powder. The ceramic is composed of: gamma-Si3N4 5-100 wt.%, at least one of Al2O3, ZrO2, alpha- or beta-Si3N4, SiC, BN and AlN 0-95 wt.%, and at least one of Y2O3, Al2O3 and La2O (sintering aid) 0-10 wt.%. The ceramic is prepared by: preparing the raw materials, dry-cooling, grinding by isostatic cool pressing, dry-pressing, assembling the sintering chamber, and sintering under an ultrahigh pressure. The method has such advantages as simple process, easy operation, low sintering temperature, and short sintering time. The ceramic has such advantages as high compactness, uniform microstructure, and good mechanical properties, and can be used in the fields of mechanics, chemical engineering, aviation and photoelectronics.

Description

technical field [0001] The invention relates to a ceramic and a preparation method thereof, in particular to a ceramic containing cubic silicon nitride powder and a preparation method thereof. This kind of ceramic is suitable for technical fields such as machinery, chemical industry, aerospace, optoelectronics and so on. Background technique [0002] Silicon Nitride (Silicon Nitride, chemical formula is Si 3 N 4 ) Ceramics are excellent high-temperature structural ceramics developed in the 1950s. It is one of the materials with the best comprehensive performance in advanced ceramics. It has excellent properties such as high temperature strength and high hardness, low creep, oxidation resistance, corrosion resistance, small specific gravity, low thermal expansion coefficient, good thermal shock resistance, and high fracture toughness, and is widely used in the production of high-performance structural ceramic materials and high-speed cutting tools. . The third phase of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/584C04B35/58C04B35/581C04B35/565C04B35/10C04B35/48C04B35/5831C04B35/622
Inventor 唐敬友寇自力贺红亮刘雨生
Owner SOUTHWEAT UNIV OF SCI & TECH
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