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Preparation method of multiscale toughened brick-mud structural super high-temperature ceramic material

A multi-scale technology for ultra-high temperature ceramics, applied in the field of preparation of functional ceramic materials, can solve problems such as anisotropy and poor damage tolerance, and achieve the effect of improving damage tolerance and reducing anisotropy problems

Active Publication Date: 2018-07-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve existing multi-component ZrB 2 -SiC ceramics have serious anisotropy and poor damage tolerance problems, and provide a multi-scale toughened brick-mud structure ultra-high temperature ceramic material preparation method

Method used

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  • Preparation method of multiscale toughened brick-mud structural super high-temperature ceramic material
  • Preparation method of multiscale toughened brick-mud structural super high-temperature ceramic material
  • Preparation method of multiscale toughened brick-mud structural super high-temperature ceramic material

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specific Embodiment approach 1

[0026] Embodiment 1: In this embodiment, a method for preparing a multi-scale toughened brick-mud structure ultra-high temperature ceramic material is specifically carried out according to the following steps:

[0027] 1. ZrB 2 After the powder and SiC powder are mixed, they are ball-milled for 8-12 hours at a ball-milling speed of 180-240r / min, and then vacuum-rotated to obtain ZrB 2 -SiC composite powder; the ZrB 2 The volume ratio of powder to SiC powder is 1:(0.2~0.5);

[0028] Second, the ZrB 2 - Put the SiC composite powder into the centrifugal granulation coating pot, and spray the polyvinyl alcohol aqueous solution with a mass fraction of 2% in the spray gun into the coating pot under the condition of rotating speed of 10-30r / min and high-pressure gas assistance and control the rotation of the coating pan to coat the polyvinyl alcohol aqueous solution with a mass fraction of 2% on the ZrB 2 -SiC composite powder surface, coating time is

[0029] 15~30min, get ZrB ...

specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: ZrB described in step one 2 The purity of the powder is 98%, and the average particle diameter is 1-2 μm. The purity of the SiC powder is 99%, and the average particle diameter is 0.5 μm. Others are the same as in the first embodiment.

[0037] ZrB described in this embodiment mode 2 The powder was purchased from Beijing Huaruike Chemical Co., Ltd.; the SiC powder was purchased from China Aladdin Reagent Co., Ltd.

specific Embodiment approach 3

[0038] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, ZrB 2 The volume ratio of powder to SiC powder is 1:0.25. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a preparation method of a multiscale toughened brick-mud structural super high-temperature ceramic material, and relates to the field of preparation of structural ceramic materials, in particular to a preparation method of the brick-mud structural super high-temperature ceramic material. The preparation method aims to solve the problem that the anisotropism of multi-component ZrB2-SiC ceramic is severe and the damage resistant tolerance is poor. The preparation method comprises the steps that 1, a ZrB2-SiC ceramic microsphere is prepared through pelleting; 2, the surfaceof the ZrB2-SiC ceramic microsphere is coated with a ZrB2-SiC-Graphene interface layer through a spraying coating method; and 3, the multiscale toughened brick-mud structural super high-temperature ceramic material is prepared through spark plasma sintering. The preparation method is used for preparing the multiscale toughened brick-mud structural super high-temperature ceramic material, the critical crack size and the fracture work of the material reach 161.8 microns and 150.3 J / m2 respectively, and the critical thermal impact temperature difference is as high as 861 DEG C.

Description

technical field [0001] The invention relates to the field of preparation of functional ceramic materials, in particular to a preparation method of a brick-mud structure ultra-high temperature ceramic material. Background technique [0002] ZrB 2 -SiC ceramics have physical and chemical properties such as high strength, high melting point, high thermal conductivity, and good oxidation and ablation resistance. ZrB 2 -SiC ceramics, as a non-ablative ultra-high temperature thermal protection material, has attracted great attention from the international materials science community. However, ZrB 2 Intrinsic brittleness and poor thermal shock resistance of SiC ceramic matrix composites are key factors limiting engineering applications in ultra-high temperature environments. Therefore, it is urgent to develop a new type of ZrB with high toughness and high thermal shock resistance 2 ceramic matrix composites. In recent years, researchers have done a lot of work to improve the ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/58C04B35/622C04B35/628C04B35/64
CPCC04B35/565C04B35/58078C04B35/622C04B35/62828C04B35/62834C04B35/62839C04B35/62894C04B35/64C04B2235/5436C04B2235/5445C04B2235/666C04B2235/9607
Inventor 韩文波程业红张幸红胡平洪长青周善宝
Owner HARBIN INST OF TECH
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