Preparation method for preparing Si2N2O-Si3N4-TiN porous ceramics

A technology of porous ceramics and mass percentage, applied in ceramic products, applications, household appliances, etc., can solve the problems of high cost and complicated process, and achieve the effect of improving strength, simplifying process, and good thermal shock resistance

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

This method needs to involve the introduction of complex pore-forming agents, the process is relatively complicated, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present invention uses Si powder (particle size2 Powder (particle size2 N 2 O-generated additives to TiO 2 , Al 2 o 3 (99.9% pure) and Y 2 o 3 (99.9% pure) composed of TiO 2 -Al 2 o 3 -Y 2 o 3 as a sintering aid.

[0034] Accurately weigh the raw materials of each component according to the following mass percentages: including 50% Si powder, 40% TiO 2 Powder, 10% Al 2 o 3 -Y 2 o 3 (where Al 2 o 3 : Y 2 o 3 The mass percentage is 55%: 45%), with ethanol as solvent, with Si 3 N 4 The ball is the ball milling medium, mixed on a planetary ball mill for 8 hours, after mixing and drying, a uniformly mixed Si-TiO 2 -Al 2 o 3 -Y 2 o 3 Mix powder.

[0035] Si-TiO 2 -Al 2 o 3 -Y 2 o 3 After the mixed powder is put into the mold for compression molding, the obtained Si-TiO 2 -Al 2 o 3 -Y 2 o 3 The green body is put into a boron nitride crucible, and the temperature is raised to 1400°C at a heating rate of 20°C / min for 2 hours. The whole sint...

Embodiment 2

[0038] Accurately weigh the raw materials of each component according to the following mass percentages: including 40% Si powder, 50% TiO 2 Powder, 10% Al 2 o 3 -Yb 2 o 3 Powder (of which Al 2 o 3 : Yb 2 o 3 The mass percentage is 60%: 40%), Si is prepared according to the method of Example 1 3 N 4 Ceramics, wherein the sintering process is to raise the temperature to 1375 ° C for 1 hour, and prepare Si 2 N 2 O-Si 3 N 4 - TiN porous ceramics.

[0039] The Si prepared in this example 2 N 2 O-Si 3 N 4 - TiN porous ceramics with a porosity of 50%, a material hardness of 700HV, and a fracture toughness of 3.5MPam 1 / 2 , The bending strength is 350Mpa.

Embodiment 3

[0041] Accurately weigh the raw materials of each component according to the following mass percentages: including 60% Si powder, 20% TiO 2 Powder, 20% Al 2 o 3 -Gd 2 o 3 Powder (of which Al 2 o 3 :Gd 2 o 3 The mass percentage is 75%: 25%), Si is prepared according to the method of Example 1 3 N 4 Ceramics, wherein the sintering process is to heat up to 1450 ° C for 2 hours to prepare Si 2 N 2 O-Si 3 N 4 - TiN porous ceramics.

[0042] The Si prepared in this example 2 N 2 O-Si 3 N 4 - TiN porous ceramics, the porosity is 55%, the hardness of the material is 750HV, and the fracture toughness is 3MPam 1 / 2 , The bending strength is 380Mpa.

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Abstract

The present invention discloses a preparation method for preparing Si2N2O-Si3N4-TiN porous ceramics. The method comprises the steps of proportionally adding Si, TiO2 and Al2O3-Re2O3, mixing up, ball milling, and drying to obtain Si-TiO2-Al2O3-Re2O3 mixed powders; and conducting the atmosphere sintering in the nitrogen atmosphere to obtain the Si2N2O-Si3N4-TiN porous ceramics. The porosity of the obtained porous ceramics is up to 60%, and the aperture thereof is between 20 and 150 mum. The obtained porous ceramics can be used as good sound-absorption materials. The hardness of the obtained porous ceramics is 100-800 HV, and the fracture toughness of the porous ceramics is 1-4 MPam1/2. The bending strength of the obtained porous ceramics is 50-400 Mpa. Therefore, the obtained porous ceramics is excellent in thermal shock resistance, oxidation resistance and the like. The dielectric constant of the porous ceramics is 3.5-7.0, and the porous ceramics can be used as thermal protection materials and wave-transparent materials in the fields of aerospace, mechanical industry and the like. Meanwhile, the porous ceramics can also be applied to reactors, filters and the like in the fields of automobile exhaust gas treatment and chemical engineering.

Description

technical field [0001] The present invention specifically relates to a Si 2 N 2 O-Si 3 N 4 -Preparation method of TiN porous ceramics. Background technique [0002] Si 2 N 2 O ceramics have excellent properties such as oxidation resistance, thermal shock resistance, and high-temperature thermodynamic stability, and are widely used in high-temperature electrical insulation materials, solid electrolytes, refractory materials, and high-temperature heat-resistant components. Especially in some extremely harsh environments, in terms of air and water purification, Si 2 N 2 O also has a good application prospect. In order to maximize the Si 2 N 2 The purification effect of O needs to increase its porosity or improve the surface area of ​​pores, but this will greatly reduce its corresponding mechanical properties, making it unable to maintain sufficient mechanical properties under the influence of high temperature, acidic environment, etc. (such as strength, hardness, fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/597C04B35/584C04B35/58C04B35/64
CPCC04B35/58014C04B35/584C04B35/597C04B35/64C04B38/00C04B2235/3217C04B2235/3224C04B2235/3232C04B2235/428C04B2235/656C04B2235/658
Inventor 郭伟明吴利翔陈珊璐林华泰
Owner 吉林长玉特陶新材料技术股份有限公司
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