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Repairing agent and repairing method for surface damage of silicon carbide ceramic matrix composite material

A technology of silicon carbide ceramic matrix and composite materials, which is applied in the repair agent and field of surface damage of silicon carbide ceramic matrix composite materials, can solve the problems of poor processability, long cycle, and difficult surface repair, and achieve high temperature resistance and combination High strength, low cost effect

Active Publication Date: 2021-09-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a repair agent and repair method for surface damage of silicon carbide ceramic matrix composite materials, which overcomes the problems of difficult repair of surface damage of ceramic matrix composite materials, poor manufacturability, and long cycle

Method used

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  • Repairing agent and repairing method for surface damage of silicon carbide ceramic matrix composite material
  • Repairing agent and repairing method for surface damage of silicon carbide ceramic matrix composite material
  • Repairing agent and repairing method for surface damage of silicon carbide ceramic matrix composite material

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Embodiment 2

[0031] The surface area of ​​a continuous carbon fiber reinforced silicon carbide ceramic matrix composite component is about 80×50mm 2 The surface coating falls off, and the maximum damage depth is about 0.15mm. The repair steps are as follows:

[0032] Step 1: Prepare the restorative. Adopt balance to weigh solid polycarbosilane, xylene, zirconium carbide powder, silicon carbide powder and silicon carbide whisker respectively, and its mass ratio is 1:1.6:0.5:1.2:0.02; Solid polycarbosilane, xylene, carbonized Put zirconium powder, silicon carbide powder, silicon carbide whiskers and zirconia ball milling beads with a diameter of 8 mm into a sealed ball milling tank, and ball mill at a speed of 80 rpm for 10 hours; take out the milled material liquid into a reagent bottle , and use a magnetic stirrer to continuously stir at a speed of 100 rpm for use.

[0033] Step 2: Clean up the damaged area. Use a diamond file to polish the damaged area of ​​the component to ensure tha...

Embodiment 3

[0037] The surface area of ​​a continuous silicon carbide fiber reinforced silicon carbide ceramic matrix composite component is about 20×20mm 2 The surface coating peeled off, and the maximum damage depth was about 0.3mm. The repair steps are as follows:

[0038] Step 1: Prepare the restorative. Adopt balance to weigh solid polycarbosilane, xylene, zirconium carbide powder, silicon carbide powder and silicon carbide whisker respectively, and its mass ratio is 1:1.5:0.3:1.5:0.12; Solid polycarbosilane, xylene, carbonized Put zirconium powder, silicon carbide powder, silicon carbide whiskers, and zirconia ball milling beads with a diameter of 8 mm into a sealed ball milling tank, and ball mill at a speed of 120 rpm for 20 hours; take out the milled material liquid into a reagent bottle , and use a magnetic stirrer to continuously stir at a speed of 120 rpm for use.

[0039] Step 2: Clean up the damaged area. Use a diamond file to polish the damaged area of ​​the component t...

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Abstract

The invention relates to a repairing agent and a repairing method for surface damage of a silicon carbide ceramic matrix composite material. According to the invention, solid polycarbosilane, dimethylbenzene, zirconium carbide powder, silicon carbide powder and silicon carbide whiskers in a reasonable ratio form a liquid substance with moderate viscosity. The chemical components of the repairing agent can quickly form a repairing layer having good physical and chemical compatibility with the silicon carbide ceramic matrix composite material in a natural environment. The preparation and construction processes of the repairing agent can be operated on line on the site of a damaged component. After the repairing agent is used for repairing surface damage, a repairing layer having good physical and chemical compatibility with a silicon carbide ceramic matrix composite body can be formed in a damaged area, and the repairing agent is high in bonding strength and high in temperature resistance. Through reasonable repair process parameters and matching of solid polycarbosilane, xylene, zirconium carbide powder, silicon carbide powder and silicon carbide whiskers in the reasonable ratio, the use temperature range of the repairing layer is -120 to 1400 DEG C, and the use temperature can reach 1650 DEG C in a short time.

Description

technical field [0001] The invention belongs to the field of ceramic-based composite materials and their engineering applications, and relates to a repairing agent and a repairing method for surface damage of silicon carbide ceramic-based composite materials. Background technique [0002] Silicon carbide ceramic matrix composites, represented by continuous carbon fiber reinforced silicon carbide ceramic matrix composites (abbreviated as C / SiC) and continuous silicon carbide fiber reinforced silicon carbide ceramic matrix composites (abbreviated as SiC / SiC), are ideal for hypersonic aircraft, space One of the main materials for heat-resistant structures used in space shuttle aircraft, ramjet engines, and gas turbine engines. Due to the brittleness of this kind of material itself, after transportation, assembly, daily maintenance and repeated use of component products made of this material, the surface coating of the component may be peeled off or the fiber layer may be scratc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/81
CPCC04B41/81C04B41/5059C04B41/009C04B41/5057C04B41/4983C04B41/46C04B41/4596C04B41/4539C04B41/0072
Inventor 刘持栋张建平赵东林栗尼娜张青刘小冲成来飞刘小瀛崔雪峰李芬
Owner NORTHWESTERN POLYTECHNICAL UNIV
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