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Preparation method for Si3N4-Si2N2O porous complex phase ceramic

A technology of si3n4-si2n2o and multiphase ceramics, which is applied in the field of preparation of porous multiphase ceramics, can solve the problems of complex preparation methods and easy residual SiO, and achieve the effect of simple preparation methods

Active Publication Date: 2013-12-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve existing preparation Si 3 N 4 -Si 2 N 2 The method of O porous composite ceramics has complicated preparation methods, and SiO is easy to remain in the final product. 2 technical issues, thus providing a Si 3 N 4 -Si 2 N 2 The preparation method of O porous composite ceramics

Method used

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  • Preparation method for Si3N4-Si2N2O porous complex phase ceramic
  • Preparation method for Si3N4-Si2N2O porous complex phase ceramic
  • Preparation method for Si3N4-Si2N2O porous complex phase ceramic

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specific Embodiment approach 1

[0022] Specific embodiment one: a kind of Si in this embodiment 3 N 4 -Si 2 N 2 The preparation method of O porous composite ceramics is carried out according to the following steps:

[0023] 1. Weigh Si 3 N 4 , Y 2 o 3 、Al 2 o 3 and (NH 4 ) 2 HPO 4 , where Si 3 N 4 : Y 2 o 3 :Al 2 o 3 The mass ratio of (92~95):4:2, (NH 4 ) 2 HPO 4 Accounting for Si 3 N 4 , Y 2 o 3 and Al 2 o 3 10-60vol.% of the total volume, towards Si 3 N 4 , Y 2 o 3 and Al 2 o 3 Added in (NH 4 ) 2 HPO 4 , using absolute ethanol as the dispersion medium to carry out ball milling and mixing for 5-24 hours to obtain a slurry;

[0024] 2. Dry the slurry under the condition of flowing air at a temperature of 40-80°C, sieve the dried mixed powder, and hold the pressure for 1-2min under a pressure of 20-30MPa for preforming to obtain a block material ;

[0025] 3. Take out the block material and put it into a rubber mold, pump air and seal it, hold it under a pressure of 100-30...

specific Embodiment approach 2

[0034] Specific embodiment two: the difference between this embodiment and specific embodiment one is: Si in step one 3 N 4 The powder is α-type, the purity is 86-98%, and the average particle size is 0.2-0.8 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: in step one (NH 4 ) 2 HPO 4 The particle size is 60-120 mesh. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a preparation method for Si3N4-Si2N2O porous complex phase ceramic and relates to a preparation method for porous complex phase ceramic. The invention solves the technical problems that the conventional preparation method for the Si3N4-Si2N2O porous complex phase ceramic is complex and SiO2 is remained in the final product easily. The preparation method comprises the following steps: 1, preparing raw materials; 2, preparing block materials; 3, preparing green bodies; 4, preparing porous structure green bodies; and 5, preparing the Si3N4-Si2N2O porous complex phase ceramic. The Si3N4-Si2N2O porous complex phase ceramic prepared by the method has bending strength of 132 to 267 MPa, breaking tenacity of 1.8 to 4.3 MPa.m1 / 2, actual density of 1.8 to 2.7 g / cm<3> and dielectric constant of 4.0 to 6.7, and can serve as a thermal protection material and a wave-transparent material applied in the fields of aerospace, mechanical industry and the like.

Description

technical field [0001] The invention relates to a preparation method of porous composite ceramics. Background technique [0002] Porous ceramics are a new type of structural and functional ceramic materials, with small bulk density, large specific surface area and unique physical surface characteristics, selective permeability to liquid and gas media, energy absorption or damping characteristics, and unique ceramic properties. Its high temperature resistance, corrosion resistance, high chemical stability and dimensional stability make it widely used in many aspects such as filtration, purification and separation, chemical catalyst carrier, sound absorption and shock absorption, advanced thermal insulation materials and sensing materials. [0003] Si 3 N 4 Ceramics have a series of excellent properties, such as high strength, high toughness, corrosion resistance, wear resistance, good thermal shock resistance, and excellent high temperature creep resistance. relative to Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/586C04B35/597
Inventor 贾德昌王胜金杨治华段小明周玉
Owner HARBIN INST OF TECH