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Equiaxed beta-Si3N4+TiN+O'-Sialon multiphase ceramic material and preparation method thereof

A composite ceramic, re2o3-al2o3-sio2 technology, applied in the field of ceramic materials, can solve the problems of unfavorable mechanical properties of materials, and achieve the goals of improving high temperature performance and oxidation resistance, compact crystal structure, improving strength and wear resistance Effect

Active Publication Date: 2016-09-21
吉林长玉特陶新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the β phase ratio, the better the fracture toughness, but the strength has a maximum value, and the β-Si with high aspect ratio 3 N 4 The presence of grains can improve strength and toughness, but β-Si 3 N 4 If the aspect ratio of the grain is too large, it means anisotropic growth, which is not conducive to the improvement of the mechanical properties of the material.

Method used

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  • Equiaxed beta-Si3N4+TiN+O'-Sialon multiphase ceramic material and preparation method thereof
  • Equiaxed beta-Si3N4+TiN+O'-Sialon multiphase ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Using Si powder as raw material, TiO 2 Sol, Y 2 o 3 -Al 2 o 3 -SiO 2 As a sintering aid, according to the mass fraction of Si powder in the total mass is 74.5%, TiO 2 Mass fraction is 4%, Y 2 o 3 -Al 2 o 3 -SiO 2 The mass fraction is 21.5% for batching, where Y 2 o 3 :Al 2 o 3 : SiO 2 The mass fraction ratio is 35%: 35%: 30%, with ethanol as solvent and Si 3 N 4 The ball is a ball milling medium, mixed on a planetary ball mill for 10h, and dried to obtain Si-TiO 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 Mix powder.

[0031] (2) Si-TiO 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 The mixed powder is put into the mold to obtain Si-TiO by cold isostatic pressing after dry pressing 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 Green body, cold isostatic pressing pressure 200MPa, holding time 5min.

[0032] (3) Si-TiO 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 Put the green body into a boron nitride crucible, raise the temperature to 1200°C at a heating rate of 20°C / min, and then raise the tem...

Embodiment 2

[0037] According to Si mass fraction of 71%, TiO 2 Mass fraction is 4%, Y 2 o 3 -Al 2 o 3 -SiO 2 The mass fraction is 25% for batching, where Y 2 o 3 :Al 2 o 3 : SiO 2 The mass fraction ratio is 30%: 30%: 40%, and Si-TiO is prepared according to the method of Example 1 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 The green body is then raised to 1200°C at a heating rate of 20°C / min, and then raised to 1400°C at a heating rate of 10°C / min, and kept for 2 hours. The nitrogen pressure during the holding process is 0.5MPa, and then 5 The heating rate of ℃ / min raised the temperature to 1700 ℃, and kept it for 1 hour. The nitrogen pressure was 3.0MPa during the heat preservation process, and the equiaxed β-Si was obtained by pressure reaction sintering. 3 N 4 +TiN+O'-Sialon composite ceramic material.

[0038] The relative density of the ceramic material prepared in this embodiment is 99%, the hardness is 13.5GPa, and the fracture toughness is 4MPa m 1 / 2 , the bending strength is 9...

Embodiment 3

[0040] According to Si mass fraction of 81%, TiO 2 Mass fraction is 4%, Y 2 o 3 -Al 2 o 3 -SiO 2 The mass fraction is 15% for batching, where Y 2 o 3 :Al 2 o 3 : SiO 2 The mass fraction ratio is 33.3%: 33.3%: 33.3%, and Si-TiO is prepared according to the method in Example 1 2 -Y 2 o 3 -Al 2 o 3 -SiO 2 The green body is then raised to 1200°C at a heating rate of 20°C / min, and then raised to 1400°C at a heating rate of 10°C / min, and kept for 2 hours. The nitrogen pressure during the holding process is 0.5MPa, and then 5 The heating rate of ℃ / min raises the temperature to 1750℃ and keeps it for 1h. During the holding process, the nitrogen pressure is 3.0MPa, and the equiaxed β-Si is obtained by pressure reaction sintering. 3 N 4 +TiN+O'-Sialon composite ceramic material.

[0041]The relative density of the ceramic material prepared in this embodiment is 99%, the hardness is 14GPa, and the fracture toughness is 3.5MPa·m 1 / 2 , the bending strength is 850MPa, the ...

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Abstract

The invention discloses an equiaxed beta-Si3N4+TiN+O'-Sialon multiphase ceramic material and a preparation method thereof. According to the invention, TiO2 sol is introduced as a Si powder nitriding catalyst, and a nano-TiN enhancement phase is produced in situ; a Re2O3-Al2O3-SiO2 sintering aid is introduced for promoting densification of Si3N4 sintering, such that equiaxed beta-Si3N4 grains are formed, and O'-Sialon is produced. The beta-Si3N4+TiN+O'-Sialon multiphase ceramic material provided by the invention has excellent mechanical performance, high-temperature performance, oxidation resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to an equiaxed β-Si 3 N 4 +TiN+O'-Sialon composite ceramic material and its preparation method. Background technique [0002] Si 3 N 4 The powder has two crystal forms, equiaxed α-Si 3 N 4 and long columnar β-Si 3 N 4 crystal form. It is generally believed that α-Si 3 N 4 Belongs to low temperature stable crystal form, β-Si 3 N 4 It is a high temperature stable crystal form. α-Si 3 N 4 to β-Si 3 N 4 The phase transition belongs to structural reconstruction, and the phase transition occurs at about 1420 °C. Due to β-Si 3 N 4 The unique ABAB stacked through-hole structure, this β phase has a long columnar or needle-like crystal morphology. Lange et al. (J.Am.Ceram.Soc.,62,1979,428–430) first proposed long columnar β-Si 3 N 4 α-Si 3 N 4 Precipitation in the matrix can improve the flexural strength and fracture toughness of the material. The higher the β phase r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/596C04B35/591C04B35/65
CPCC04B35/591C04B35/65C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3232C04B2235/3418C04B2235/428C04B2235/602C04B2235/6562C04B2235/6567C04B2235/658C04B2235/74C04B2235/77C04B2235/786
Inventor 郭伟明于俊杰林华泰
Owner 吉林长玉特陶新材料技术股份有限公司
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