Preparation method of carbon fiber reinforced carbon-silicon carbide dual-ceramic based gradient composite material
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A composite material and ceramic matrix technology, which is applied in the field of preparation of gradient ceramic matrix composite materials, can solve the problems of long preparation cycle and complex process, and achieve the advantages of shortened preparation cycle, simple process and excellent anti-oxidation/ablation ability. Effect
Active Publication Date: 2014-03-05
DALIAN UNIV OF TECH
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At the same time, high-temperature materials have developed towards the direction of multi-level gradient composite structures. Currently, CVI method deposits C / C-SiC gradient-based composites, and compared with C / C composites, C / C-SiC gradient-based composites show It has excellent high-temperature oxidation resistance and mechanical properties, but requires a two-step chemical vapor deposition method, and the gradual change of raw material gas ratio needs to be controlled during the deposition process. The process is complicated and the preparation cycle is long.
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Embodiment 1
[0022] 1. Cut the T300 carbon fiber cloth into a size of 100×70×60mm, place the cut fiber in a high-temperature graphite furnace, vacuumize the furnace and fill it with nitrogen protection (nitrogen pressure is 5×10 2 Pa), heat the graphite furnace to 600°C, 900°C, 1200°C, and 1500°C respectively for 1 hour, then cool naturally to room temperature, and take out the fiber cloth.
[0023] 2. Prepare resin-saturated glue according to the mass ratio of phenolic resin and absolute ethanol at 1:0.8, and let it stand in the air until the dissolution process is completed.
[0024] 3. Immerse the carbon fiber obtained in step 1 into the resin glue obtained in step 2, take it out and dry it after being fully impregnated, and then lay it in the order of untreated fiber, 600°C, 900°C, 1200°C, 1500°C heat-treated fiber The corresponding layers are 8 layers, 7 layers, 6 layers, 5 layers, and 4 layers. After the stacking is completed, a pressure of 2 MPa is applied, and then it is placed in...
Embodiment 2
[0028] The difference between this example and Example 1 is that in step 2, layers are laid according to untreated fibers, 900°C, and 1500°C heat-treated fibers, and the corresponding layers are 8 layers, 6 layers, and 4 layers respectively. Others are the same as in Example 1.
Embodiment 3
[0030] The difference between this example and Example 1 is that the selected carbon fiber cloth is T700 carbon fiber cloth, and in step 3, the corresponding layers of untreated fibers, 600°C, 900°C, 1200°C, and 1500°C heat-treated fibers are 5 layers , 4 layers, 3 layers, 3 layers, 3 layers. Others are the same as in Example 1.
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Abstract
The invention discloses a preparation method of a carbon fiber reinforced carbon-silicon carbide dual-ceramic based gradient composite material. The preparation method is characterized by comprising the following steps: (a), carrying out thermal treatment onto the fibers by adopting different temperatures; (b), dipping the fibers which are not subjected to thermal treatment and the thermally-treated fibers obtained in the step (a) in resin glue liquor, drying, continuously superposing and laying up, applying a certain pressure after laying up, and carrying out curing and post-curing treatment in sequence to prepare a composite material biscuit body with fiber/base body interface adhesive strength in gradient change; (c), carrying out high-temperature pyrolysis onto the composite material biscuit body obtained in the step (b) to obtain a carbon/carbon porous body with porosity in gradient change; (d), carrying out liquid silicon permeation onto the carbon/carbon porous body obtained in the step (c) under a high temperature to obtain the C/C-SiC composite material with SiC ceramic base body content in gradient change. The preparation method disclosed by the invention is simple in process, short in preparation period, low in cost and capable of preparing a large workpiece with a complex shape.
Description
technical field [0001] The invention relates to a preparation method of a fiber-reinforced ceramic matrix composite material, especially a preparation method of a gradient ceramic matrix composite material. Background technique [0002] Carbon fiber reinforced carbon-silicon carbide binary ceramic matrix (C / C-SiC) composites have very strong application potential in high-tech fields such as aerospace and deep space exploration due to their light weight, high specific strength and excellent high-temperature thermodynamic properties. . However, for different technical fields, the performance requirements of C / C-SiC composite materials are different, and the oxidation resistance and toughness of C / C-SiC composite materials strongly depend on the content of SiC ceramic matrix, which requires the The structure and performance of C / C-SiC composite materials have strong designability. At the same time, high-temperature materials have developed towards the direction of multi-level...
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