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A method for preparing graphene network toughened zrc-sic ultra-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: 2021-06-01
HARBIN INST OF TECH
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  • 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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  • A method for preparing graphene network toughened zrc-sic ultra-high temperature ceramic material
  • A method for preparing graphene network toughened zrc-sic ultra-high temperature ceramic material
  • A method for preparing graphene network toughened zrc-sic ultra-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 minutes 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 vacuum-dry t...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment is different from Embodiment 1 in that: in Step 1, the graphene oxide has 3-5 layers. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, 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

A method for preparing a graphene network toughened ZrC-SiC ultra-high temperature ceramic material, and the invention relates to the field of preparation methods of ceramic materials. The present invention aims to solve the technical problem of the existing poor ZrC-SiC damage tolerance. Method: 1. Preparation of graphene oxide aqueous solution; 2. Preparation of graphene oxide dispersion; 3. Directional freezing to prepare PVA-modified graphene network; 4. Thermal reduction and vacuum impregnation to prepare graphene network-wrapped ceramic powder Green body; 5. Spark plasma sintering. The fracture toughness of the ceramic material prepared by the inventive method is by 3.82MPa m 1 / 2 increased to 4.26MPa·m 1 / 2 , the critical crack size increased from 26.8μm to 119.4μm, and the work of fracture increased from 44.7J / m 2 increased to 151.6J / m 2 . The invention is used for preparing ceramic materials.

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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Patent Type & Authority Patents(China)
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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