Preparation method of superhigh-temperature ceramic-based composite material with axial gradient and plane homogeneity

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of C/C composite material preparation, can solve the problems of reduced mechanical properties, and achieve the effect of avoiding uneven distribution

Active Publication Date: 2022-04-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects existing in the actual application process of the existing axially homogeneous and planar heterogeneous ceramic modified C / C composite materials, the purpose of the present invention is to provide an ultra-high temperature ceramic matrix composite material with axial gradient and planar homogeneity The preparation method of the method combines axial gradient carbon fiber preform weaving and gradient low-melting point alloy wire lattice implantation, so that the carbon phase changes in an axial gradient, and the ceramic phase presents a continuous composition gradient inside the gradient C / C matrix. The shape of the distribution and the homogeneous distribution of the planar lattice can realize the anti-ablation and anti-oxidation performance requirements of different temperature fields, the integrated effect of anti-heat insulation, and the effect of the planar homogeneous ceramic phase distribution, while avoiding the composition mutation. The disadvantage of reduced mechanical properties

Method used

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  • Preparation method of superhigh-temperature ceramic-based composite material with axial gradient and plane homogeneity
  • Preparation method of superhigh-temperature ceramic-based composite material with axial gradient and plane homogeneity
  • Preparation method of superhigh-temperature ceramic-based composite material with axial gradient and plane homogeneity

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Embodiment 1

[0082] like figure 1 As shown in the figure, the preform is prepared by the method of fine braided puncture, and the gradient structure of the density of the preform is controlled by controlling the diameter of the steel needle (which is a metal steel needle), wherein the puncture tool used for the near ablation end of the fine braided puncture preform is prepared The diameter of the piercing tool used to prepare the ablation transition section of the finely braided puncture preform is 0.2 mm, and the diameter of the puncturing tool used to prepare the far ablation end of the finely braided puncture preform is 0.1 mm.

[0083] (1) The finely braided puncture preform forms a carbon fiber preform structure with gradient changes in carbon fiber content and density from the near ablation end to the far ablation end, with a total thickness of 20mm, and is reserved for the introduction of ultra-high temperature ceramics. Refractory metal and alloy wire or rod, with a density of 0.9 ...

Embodiment 2

[0091] The preform is prepared by the method of fine weaving and puncturing, and the ultra-high temperature ceramic needle is used as the puncturing tool. When weaving the near ablation end, the diameter of the three-dimensional weaving is selected to form a gradient of carbon fiber content and density from the near ablation end to the far ablation end. The carbon fiber prefab structure,

[0092] (1) The density of the carbon fiber preform near the ablation end is 0.9g / cm 3, the density of the carbon fiber preform increases from the near ablation end to the far ablation end, while the density of the carbon fiber preform at the far ablation end is 1.1g / cm 3 . At the same time, in the process of axial needling, the ultra-high temperature ceramic rod ZrC was selected as the needling structure at the same time, and the ultra-high temperature ceramic rods of different densities were implanted in different axial regions in the carbon fiber preform. Among them, the diameter of the ...

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Abstract

The invention discloses a preparation method of an axial gradient and planar homogeneous ultrahigh-temperature ceramic matrix composite, which comprises the following steps of: enabling a carbon phase to change in an axial gradient manner by a method of combining axial gradient carbon fiber preform weaving and gradient low-melting-point alloy wire dot matrix implanting; the ceramic phase is in a form of continuous component gradient distribution and planar lattice homogeneous distribution in the gradient C / C matrix, and the method realizes the design of a strong ceramic phase interface close to the ablation end in the axial direction and the phase distribution regulation and control that the content of the superhigh-temperature ceramic phase is sequentially decreased and the carbon phase is sequentially increased in the direction from the ablation end close to the ablation end far away from the ablation end; in the plane direction, the ceramic phases are uniformly distributed, and finally the gradient ceramic-based composite material which meets the material performance requirements and is characterized in that the components and contents of different ceramic phases and carbon phases in the axial direction are in gradient change, and the ceramic phases are uniformly distributed on the plane is formed.

Description

technical field [0001] The invention belongs to the technical field of C / C composite material preparation, and in particular relates to a method for preparing an axial gradient and plane homogeneous ultra-high temperature ceramic matrix composite material. Background technique [0002] With the rapid development of aerospace vehicles, the environment faced by key thermal protection structural parts of hypersonic vehicles is becoming more and more severe. During the flight of the aircraft, the surface of the wing and leading edge is subjected to the test of high temperature oxidation, mechanical and shock load impact, especially the inner wall near the heat insulation layer needs to withstand a temperature drop of 1000 °C. This puts great demands on the constituent materials of key thermal structural parts, that is, it needs to meet the ablation resistance of the material surface, the oxidation resistance of the inner surface at a lower temperature range, and the excellent me...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B35/83C04B35/84C04B35/76
CPCC04B35/83C04B35/76C04B2235/428C04B2235/61C04B2235/612C04B2235/46C04B2235/77C04B2235/96C04B2235/3826C04B2235/483
Inventor孙威田甜熊翔张红波
OwnerCENT SOUTH UNIV