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Preparation method of ultrahigh-temperature ceramic modified C/C composite material

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of preparation of ultra-high temperature ceramic modified C/C composite materials, can solve the problems of high infiltration temperature, decreased mechanical properties of materials, and reduced alloy Si ratio.

Active Publication Date: 2020-02-18
深圳金羽先进材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, it is limited by the defects of the RMI method: pure metal powder or alloy infiltration is used, the infiltration temperature is too high (>2000°C), the fibers in the matrix are seriously damaged, and the mechanical properties of the material decrease significantly; low-melt alloys such as Zr-Si or Hf are used Alloys such as -Si can reduce the infiltration temperature, but after the alloy melt reacts with the C matrix, a large amount of SiC and a small amount of unreacted low-melting alloy phase remain inside the matrix, which is not conducive to the application in extreme high temperature and oxygen-poor environments
While reducing the proportion of Si in the alloy, the melting point and viscosity of the material will also increase, and the difficulty of infiltration of the alloy will increase.

Method used

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  • Preparation method of ultrahigh-temperature ceramic modified C/C composite material
  • Preparation method of ultrahigh-temperature ceramic modified C/C composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] First, polish the 2.5D needle-punched C / C composite material with SiC sandpaper. The matrix density of the C / C composite material is 1.25g / cm. 3 ; The Zr and Si elemental powders are mixed uniformly according to the mass ratio of 6:4, and mixed with alcohol for 12h, dried in a blast box and sieved to obtain a uniformly mixed Zr-Si powder.

[0048] Mix Zr-Si powder, K 2 ZrF 6 , NaCl salt is dry mixed, the mixing ratio is 8:8:1, and the infiltration powder is obtained after mixing for 12 hours.

[0049] Put the C / C composite material matrix into the bottom of the graphite crucible, embed the infiltrating powder into the matrix, and finally put the crucible into a medium and high frequency graphitization furnace for infiltration under an argon atmosphere. Infiltration process: heat up from room temperature to 1200°C and keep it for 1h, then pump to minus 200Pa, then immediately inflate and continue to heat up at 1900°C and keep it for 2h. The heating rate in the whole process is...

Embodiment 2

[0053] First, polish the 2.5D needle-punched C / C composite material with SiC sandpaper. The matrix density of the C / C composite material is 1.25g / cm. 3 ; The Zr and Si elemental powders are mixed uniformly according to the mass ratio of 6:4, and mixed with alcohol for 12h, dried in a blast box and sieved to obtain a uniformly mixed Zr-Si powder.

[0054] Mix Zr-Si powder, K 2 ZrF 6 , NaCl salt is dry mixed, the mixing ratio is 8:6:1, and the infiltration powder is obtained after mixing for 12 hours.

[0055] Put the C / C composite material matrix into the bottom of the graphite crucible, embed the infiltrating powder into the matrix, and finally put the crucible into the medium and high frequency graphitization furnace for infiltration under an argon protective atmosphere. Infiltration process: heating from room temperature to 1200℃ and holding for 1h, then pumping to minus 200Pa, then inflating and continuing to heat up at 1800℃ and holding for 2h, the whole heating rate is about 15...

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Abstract

The invention discloses a preparation method of an ultrahigh-temperature ceramic modified C / C composite material, and the method comprises the following steps: carrying out reactive infiltration treatment on a C / C composite material preform to obtain the ultrahigh-temperature ceramic modified C / C composite material; wherein during the reactive infiltration treatment, infiltration powder containinga reactive molten salt is used as an infiltration raw material, and the infiltration powder comprises Zr-Si mixed powder, K2ZrF6 powder and an alkali metal salt; according to the invention, the reactive molten salt is used as the infiltration raw material for the first time, a molten salt method is combined with reaction infiltration to realize two-step infiltration in a C / C matrix, the C / C-UHTCscomposite material with ultrahigh content of ZrC ceramic is formed through reaction, and the content of ZrC in the matrix is greater than or equal to 83%; and the ablation resistance is greatly improved.

Description

Technical field [0001] The invention relates to a preparation method of an ultra-high-temperature ceramic modified C / C composite material with ultra-high content of ZrC; it belongs to the technical field of high-temperature resistant composite material preparation. Background technique [0002] Ultra-high temperature ceramic modified C / C composite material (C f -UHTCs composite material) has excellent high temperature oxidation resistance and ablation resistance compared with C / C or C / SiC materials, and also has good fracture toughness and thermal shock resistance. It is an excellent thermal structure material for aerospace one. [0003] Now C f -UHTC composite materials have many preparation methods, such as precursor immersion cracking (PIP), reactive infiltration (RMI), slurry infiltration (SI), in-situ reaction, hot pressing (HP), sol-gel, etc. Among many methods, the RMI method relies on the low melting point alloy melt to infiltrate porous C / C composite materials, which can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5059C04B41/87C04B41/5057C04B41/455C04B41/0072C04B35/83
Inventor 孙威徐永龙熊翔
Owner 深圳金羽先进材料有限公司
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