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Method for preparing graphene network toughening ZrC-SiC super-high temperature ceramic material

A technology of ultra-high temperature ceramics and graphene, which is applied in the field of preparation of ceramic materials, can solve the problems of ZrC-SiC poor damage tolerance and achieve the effect of improving the damage tolerance

Active Publication Date: 2018-06-19
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 technical problem of the existing poor ZrC-SiC damage tolerance, and provides a method for preparing graphene network toughened ZrC-SiC ultra-high temperature ceramic material

Method used

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  • Method for preparing graphene network toughening ZrC-SiC super-high temperature ceramic material
  • Method for preparing graphene network toughening ZrC-SiC super-high temperature ceramic material
  • Method for preparing graphene network toughening ZrC-SiC super-high temperature ceramic material

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specific Embodiment approach 1

[0023] Embodiment 1: In this embodiment, a method for preparing a graphene network toughened ZrC-SiC ultra-high temperature ceramic material is carried out according to the following steps:

[0024] 1. Add graphene oxide powder into deionized water, stir thoroughly for 20-30 minutes, and ultrasonically for 10-15 minutes to obtain graphene oxide aqueous solution;

[0025] 2. Add polyvinyl alcohol to the graphene oxide aqueous solution obtained in step 1, and stir continuously for 20 to 30 min to obtain a graphene oxide dispersion;

[0026] 3. Put the graphene oxide dispersion obtained in step 2 into a directional freezer, pre-freeze for 6-10 hours at a temperature of -20 to -10°C, and then vacuum freeze-dry to obtain a PVA-modified graphene network ;

[0027] 4. Thermally reduce the PVA-modified graphene network obtained in step 3 at a temperature of 70-100°C for 5-10 hours, then put it into a vacuum impregnation device, impregnate the ceramic slurry, and then dry it in vacuum...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the graphene oxide in step one is 3~5 layers. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the ultrasonic power is 100W, and the frequency is 180KHz. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing a graphene network toughening ZrC-SiC super-high temperature ceramic material, which relates to the field of the preparation method of the ceramic material. The method solves the technical problem of poor damage tolerance resistance of the current ZrC-SiC. The method comprises the following steps: 1) preparing a graphene oxide aqueous solution; 2) preparing graphene oxide dispersion liquid; 3) performing directional freezing to prepare PVA-modified graphene network; 4) performing hot reduction and vacuum dipping to prepare a green compact of thegraphene network coated with ceramic powder; and 5) performing discharge plasma sintering. The fracture toughness property of the ceramic material is increased from 3.82 MPa.m1 / 2 to 4.26 MPa.m1 / 2, a critical crack size is increased from 26.8 [mu]m to 119.4 [mu]m, the work of fracture is increased from 44.7 J / m2 to 151.6 J / m2. The method is used for preparing the ceramic material.

Description

technical field [0001] The invention relates to the field of preparation methods of ceramic materials. Background technique [0002] Zirconium carbide (ZrC) ceramics have become one of the most promising candidates for ultra-high temperature applications including rocket engine nozzles, supersonic vehicles, knives, etc. due to high melting temperature (≥3500 °C), high thermal and electrical conductivity. However, due to the high melting point, strong covalent bonds, and low self-diffusion coefficient of ZrC, the dense composites exhibit poor sinterability without sintering aids. In addition, due to low fracture toughness, poor thermal shock resistance, and poor high-temperature oxidation resistance in oxidizing atmospheres, their applications are greatly limited. It has been proved that adding SiC into the ZrC matrix can improve the mechanical properties and oxidation resistance of ZrC materials. [0003] As a two-dimensional material in the carbon material family, graphen...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/56C04B35/622
CPCC04B35/806C04B35/5622C04B35/622C04B2235/3826C04B2235/5248
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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