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Shell-imitated ceramic-based composite material and preparation method thereof

A composite material and ceramic-based technology, applied in the field of shell-like ceramic-based composite materials and their preparation, can solve the problem of insufficient mechanical properties and achieve the effect of improving strength and fracture toughness

Active Publication Date: 2017-12-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the layered structure inside these layered ceramic matrix composites is usually flat, that is, the ceramic layers inside them are usually flat, unlike the wavy and curved layered structure in shell nacre, which makes Their mechanical properties are still not high enough compared to shell nacre

Method used

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  • Shell-imitated ceramic-based composite material and preparation method thereof
  • Shell-imitated ceramic-based composite material and preparation method thereof
  • Shell-imitated ceramic-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Pour alumina powder and polyvinyl alcohol accounting for 2 wt% of the alumina powder into deionized water, and stir evenly to obtain an aqueous dispersion of alumina ceramic particles with an alumina content of 15 wt%.

[0044] 2) Place the water dispersion of aluminum oxide ceramic particles obtained in step 1) into a water cup-shaped freezing mold made of a metal rod inserted into the bottom of the polytetrafluoroethylene tube, and then immerse the metal rod at the bottom of the freezing mold in the In the refrigerant, the ceramic particle aqueous dispersion is directional frozen through the heat transfer of the metal rod until the ceramic particle aqueous dispersion is completely frozen, that is, an ice cube containing the ceramic particle assembly is obtained.

[0045] 3) Freeze-dry the ice cube containing the ceramic particle assembly obtained in step 2) for 48 hours at a temperature lower than -25°C and an air pressure lower than 100 Pa to obtain a porous alumin...

Embodiment 2

[0053] 1) Pour alumina powder and polyvinyl alcohol accounting for 4 wt% of the alumina powder into deionized water, and stir evenly to obtain an aqueous dispersion of alumina ceramic particles with an alumina content of 20 wt%.

[0054] 2) Place the water dispersion of aluminum oxide ceramic particles obtained in step 1) into a water cup-shaped freezing mold made of a metal rod inserted into the bottom of the polytetrafluoroethylene tube, and then immerse the metal rod at the bottom of the freezing mold in the In the refrigerant, the ceramic particle aqueous dispersion is directional frozen through the heat transfer of the metal rod until the ceramic particle aqueous dispersion is completely frozen, that is, an ice cube containing the ceramic particle assembly is obtained.

[0055] 3) Freeze-dry the ice cube containing the ceramic particle assembly obtained in step 2) for 48 hours at a temperature lower than -25°C and an air pressure lower than 100 Pa to obtain a porous alumin...

Embodiment 3

[0063] 1) Pour alumina powder and polyvinyl alcohol accounting for 5 wt% of the alumina powder into deionized water, and stir evenly to obtain an aqueous dispersion of alumina ceramic particles with an alumina content of 25 wt%.

[0064] 2) Place the water dispersion of aluminum oxide ceramic particles obtained in step 1) into a water cup-shaped freezing mold made of a metal rod inserted into the bottom of the polytetrafluoroethylene tube, and then immerse the metal rod at the bottom of the freezing mold in the In the refrigerant, the ceramic particle aqueous dispersion is directional frozen through the heat transfer of the metal rod until the ceramic particle aqueous dispersion is completely frozen, that is, an ice cube containing the ceramic particle assembly is obtained.

[0065] 3) Freeze-dry the ice cube containing the ceramic particle assembly obtained in step 2) for 48 hours at a temperature lower than -25°C and an air pressure lower than 100 Pa to obtain a porous alumin...

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Abstract

The invention discloses a shell-imitated ceramic-based composite material. The shell-imitated ceramic-based composite material is prepared by an ice template method and a liquid-phase infiltration technology, and is characterized by comprising a layered structure, wherein ceramic layers and second phase layers are alternately overlapped to form a layered structure; each ceramic layer has surface projections and an interlayer bridging structure; and the ceramic layers and the second phase layers are bent in a wavy manner. Preparation of the wavy bent layered structure is realized by compression of a porous ceramic blank which has the straight layered structure, and meanwhile, the degree of bending of the ceramic layers can be controlled by adjustment of compression deformation of the blank. Along with increasing of amount of compression, the curvature of the bent ceramic layers in the blank is increased. Mechanical performance tests show that if the bending degree of the layered structure of the shell-imitated ceramic-based composite material is increased properly, the strength and fracture toughness of the composite material can be improved effectively.

Description

technical field [0001] The invention relates to a shell-like ceramic-based composite material and a preparation method thereof, belonging to the technical field of ceramic-based composite materials. Background technique [0002] Ceramic materials have the advantages of high strength, high melting point, good thermal stability, small thermal expansion coefficient, good oxidation resistance, low density, high hardness, wear resistance, abundant resources, and low price. They are used in aerospace, energy, machinery, automobiles, etc. and other fields have broad application prospects. However, the inherent brittleness of ceramic materials makes them very sensitive to defects and poor in reliability, which severely restricts their further development and large-scale engineering applications. [0003] Bionic structure design is an important means to improve material properties. Shell nacre in nature is composed of brittle aragonite wafers (CaCO 3 ) and tough organic matrix in ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/634C04B41/83
CPCC04B35/10C04B35/622C04B35/63416C04B41/4853C04B41/83C04B2235/96C04B41/4523C04B41/0072
Inventor 史国栋武湛君杨雷王亨利王君涵
Owner DALIAN UNIV OF TECH
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