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Self-healing ceramic matrix composite and low-temperature rapid preparation method thereof

A composite material and ceramic-based technology, which is applied in the field of rapid preparation of ceramic-based composite materials and mud-assisted precursor dipping cracking method at low temperature, which can solve the problems of long composite material preparation period, formation of cracks and pores in the matrix, and great influence on the fiber system and other problems to achieve the effect of shortening the preparation cycle, reducing erosion and reducing costs

Active Publication Date: 2019-04-12
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of 2D C / SiC composite materials mainly adopts the method of carbon cloth lay-up molding, which has the advantages of simple process and low preparation cost, and the disadvantage of low interlayer shear strength and easy delamination
And with the development of the aerospace industry, higher requirements are put forward for ceramics (especially ceramic matrix composites), and ceramic matrix composites with high quality and special-shaped structures are required to be prepared, which puts new challenges on the preparation process of ceramic matrix composites. Challenges: (1) The matrix material prepared by the traditional precursor impregnation-pyrolysis method has a large volume shrinkage during the pyrolysis process, and it is easy to form defects such as cracks and pores in the matrix, which requires repeated dipping-pyrolysis processes (>15 cycle), resulting in a longer preparation cycle for composite materials; (2) The traditional precursor impregnation-pyrolysis method has a high preparation temperature (≥1000°C), which has a greater impact on the fiber system

Method used

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  • Self-healing ceramic matrix composite and low-temperature rapid preparation method thereof
  • Self-healing ceramic matrix composite and low-temperature rapid preparation method thereof
  • Self-healing ceramic matrix composite and low-temperature rapid preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a C f / SiOC-MoSi 2 Matrix composite materials, the preparation method of which is as follows figure 1 As shown, the following steps are included: (1) 8 layers of T300 carbon fiber cloth with a thickness of 0.28 mm are laid flat, and then stitched. The fiber used for stitching is commercially available common T300 carbon fiber. The distance between two sutures is 5mm; (2) Weigh silicone resin, MoSi 2 Micropowder and absolute alcohol, including silicone resin, absolute alcohol and MoSi 2 The weighing ratio of the micropowder is 1:1:5 by mass, and the MoSi 2 Put the micropowder and silicone resin into absolute ethanol, and stir for 4 hours by magnetic force to form a silicone resin solution doped with MoSi 2 Suspension of micropowder; (3) Clamp the T300 carbon fiber cloth obtained in step (1) with a graphite mold, place it in a vacuum container, vacuum inhale the suspension obtained in step (2), and soak for 8h; (4) Place the T300 carbon fibers impregnated in step (3...

Embodiment 2

[0041] A SiC f / SiOC-MoSi 2 Composite materials, methods for their preparation, such as figure 1 As shown, the following steps are included: (1) 8 layers of second-generation SiC fiber cloth produced by the National University of Defense Technology with a thickness of 0.23 mm are laid flat, and then stitched. The fiber used for stitching is the second-generation SiC fiber. In order to obtain a higher Excellent mechanical properties, the distance between every two sutures is designed to be 10mm; (2) Weigh silicone resin, MoSi 2 Micropowder and absolute alcohol, including silicone resin, absolute alcohol and MoSi 2 The weighing ratio of the micropowder is 1:2:1 by mass, and the MoSi 2 Put the micropowder and silicone resin into absolute ethanol, and stir it by magnetic force for 8 hours to form a silicone resin solution doped with MoSi 2 Suspension of micropowder; (3) Clamp the SiC fiber cloth obtained in step (1) with a heat-resistant steel mold, place it in a vacuum conta...

Embodiment 3

[0047] To the obtained C of embodiment 1 f / SiOC-MoSi 2 The base composite material was subjected to oxidation treatment at 1200° C., and the oxidation time was 2 hours. The preparation method of the composite material was the same as that in Example 1. image 3 It is the surface and section SEM diagram of the self-healing ceramic matrix composite material obtained in Example 1 of the present invention, wherein (a) is the surface SEM; (b) is the section SEM; Figure 4 It is the SEM image of the surface and section of the self-healing ceramic matrix composite material obtained in Example 1 of the present invention after being oxidized at 1200 ° C for 2 hours, wherein (a) is the surface SEM; (b) is the section SEM, from figure 2 (a) and (b) with image 3 Comparing (a) and (b), it can be seen that MoSi 2 It is oxidized at a temperature of 1200°C to form a fluid glass phase, which realizes the sealing of surface cracks and matrix cracks. The porosity of the material decreases fr...

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Abstract

The invention provides a low-temperature rapid preparation method of a self-healing ceramic matrix composite. The composite is prepared by adopting a high temperature resistance inorganic fiber clothor a thin fabric as a reinforcing phase, adopting silicon resin and MoSi2 micro powder and the like as a matrix, performing repeated densification through a slurry auxiliary vacuum impregnation-high-temperature cracking technology. Due to the acupuncture or puncture sewing technology in the preparation method, the material flexibility is ensured, and the composite is better applicable to molding of large-size and complex components; meanwhile, the method is short in preparation period, and the composite is low in cost; the preparation technology is mature, and the production efficiency is high; the composite obtained through the method has the proper viscous flowing capability, and the packing effect is improved while the packing temperature is increased; the high dielectric dispersing resistance is achieved, and corrosion of environment media to fiber is reduced; raw materials are wide in source, preparation is easy, operation is easy, the method is expected to be an effective methodin the industrial field for producing and preparing the ceramic matrix composite in a large scale, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a ceramic matrix composite material and a method for rapidly preparing the material by a mud-assisted precursor dipping and pyrolysis method at low temperature. Background technique [0002] Fiber-reinforced ceramic matrix composites are an emerging material system with high specific strength, high specific modulus, high temperature resistance and ablation resistance, which is developed rapidly in recent years with continuous fiber as reinforcement and ceramic as matrix. [0003] It is generally believed internationally that carbon fiber reinforced ceramic matrix composites are one of the technical commanding heights of high-temperature structural materials used in aerospace, and can reflect the design and manufacturing capabilities of advanced aerospace vehicles. Therefore, it is of great significance to vigorously develop the technology of carbon fiber r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/84
CPCC04B35/806C04B2235/3256C04B2235/3418C04B2235/3891C04B2235/483C04B2235/5228C04B2235/5244C04B2235/5248C04B2235/77C04B2235/96
Inventor 向阳曹峰彭志航
Owner NAT UNIV OF DEFENSE TECH
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