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A biomimetic layered alumina morphology composite ceramic material based on nano-texture toughening

A technology of nano-texture and composite ceramics, which is applied in the field of structural ceramic materials and its preparation, and can solve problems such as low toughness, limited improvement in toughening effect, and reduced ceramic strength

Active Publication Date: 2020-02-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of low toughness of the existing structural ceramics, the reduction of the strength of the ceramics or the very limited improvement of the toughening effect based on the pure strong-weak interlayer and pure strong-strong interlayer structures, and provides a nano-texture-based toughening Biomimetic layered alumina morphology composite ceramic material and preparation method thereof

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  • A biomimetic layered alumina morphology composite ceramic material based on nano-texture toughening
  • A biomimetic layered alumina morphology composite ceramic material based on nano-texture toughening
  • A biomimetic layered alumina morphology composite ceramic material based on nano-texture toughening

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specific Embodiment approach 1

[0035] Specific embodiment one: combination Figure 1 to 3 This embodiment will be specifically described. This embodiment is based on the nano-texture toughened biomimetic layered alumina morphology composite ceramic material as the matrix Al of equiaxed grains. 2 O 3 Nano-textured Al of reinforcement layer and flaky grains 2 O 3 The toughened layers are alternately arranged into a symmetrical structure, based on the nano-texture toughened biomimetic layered alumina morphology composite ceramic material with a matrix of equiaxed grains on both sides of Al 2 O 3 Reinforcement layer, or nano-textured Al with flake grains on both sides 2 O 3 Toughened layer

[0036] Set the matrix of equiaxed grains Al 2 O 3 The thickness of the reinforcement layer is t E , Suppose the nano-textured Al 2 O 3 Toughened layer thickness is t T , 1≤t E :t T ≤20, and t T ≥5μm;

[0037] The matrix of equiaxed grains Al 2 O 3 The reinforcement layer is composed of spherical particles of equiaxed Al 2 O 3 Fin...

specific Embodiment approach 2

[0040] Specific implementation manner two: combination Figure 4 To describe this embodiment in detail, the method for preparing a biomimetic layered alumina morphology composite ceramic material based on nano-texture toughening is completed in the following steps:

[0041] 1. Using the casting process to prepare the matrix Al of equiaxed grains 2 O 3 Enhanced layer body diaphragm:

[0042] Weigh the equiaxed Al of spherical particles 2 O 3 For fine-crystalline powder and second phase, prepare casting slurry A according to the aqueous system method or organic system method, then place the casting slurry A in a vacuum device to remove air bubbles, and finally the height of the casting knife edge is 30μm~400μm Under the conditions of, use a casting machine to cast, and dry after casting to obtain a matrix of equiaxed grains of Al 2 O 3 Reinforcement layer body film; the second phase is t-ZrO 2 , SiC or Si 3 N 4 ;

[0043] The volume of the second phase is the same as the equiaxed Al of...

specific Embodiment approach 3

[0057] Specific embodiment three: this embodiment is different from the specific embodiment two in: the equiaxed Al of the spherical particles described in step one 2 O 3 The particle size of the fine-grained powder ≤200nm; t-ZrO described in step one 2 The particle size of SiC is less than or equal to 200nm; the particle size of SiC described in step one is less than or equal to 100nm; the Si described in step one 3 N 4 The particle size is ≤300nm. Others are the same as the second embodiment.

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Abstract

The invention provides a bionic layered alumina morphology composite ceramic material based on nano-texture toughening, and a preparation method of the composite ceramic material. The invention relates to a structural ceramic material and a preparation method thereof. The invention aims at solving the problems that in the prior art, structural ceramic is low in toughness, and the ceramic strengthis reduced or the toughening effect improvement amplitude is very limited based on pure strong-weak interlayer and pure strong-strong interlayer structures. The ceramic material has a symmetrical structure formed by matrix Al2O3 reinforcing layers of equiaxed grains and nano-textured Al2O3 toughening layers of sheet grains in an alternately-arranged way. The method comprises the following steps: 1, preparing ferrite diaphragms of the matrix Al2O3 reinforcing layers of the equiaxed grains by adopting a tape casting process; 2, preparing ferrite diaphragms of the nano-textured Al2O3 toughening layers of the sheet grains by adopting the tape casting process; 3, performing stacking-pressing on the two types of ferrite diaphragms, evenly pressing with hot water, discharging rubber and performing cold isostatic pressing; and 4, combining atmospheric sintering with hot isostatic pressing sintering to prepare bionic layered Al2O3 composite ceramics.

Description

Technical field [0001] The invention relates to a structural ceramic material and a preparation method thereof. Background technique [0002] Advanced structural ceramic materials have gradually become aerospace, new energy, electronic information, metallurgy, petrochemical, and automotive due to their excellent properties, such as high temperature resistance, corrosion resistance, oxidation resistance, wear resistance, high strength, and high hardness. , Biomechanics and other key materials indispensable in industrial technology fields. As one of the basic materials of science and technology in the 21st century, alumina (Al 2 O 3 ) Is a typical material in advanced structural ceramics and one of the most widely used ceramic materials in modern society. Al 2 O 3 Although it has many of the above advantages, but like other ceramics, it has the fatal weakness, that is, it is brittle, very sensitive to defects, and low toughness. This determines its low reliability and poor anti-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10
CPCC04B35/10C04B2235/3206C04B2235/3208C04B2235/3229C04B2235/3232C04B2235/3244C04B2235/3418C04B2235/3826C04B2235/3873C04B2235/443C04B2235/48C04B2235/483C04B2235/77C04B2235/96
Inventor 常云飞孙媛刘迎春杨彬曹文武
Owner HARBIN INST OF TECH
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