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A method for reducing the viscosity of polycarbosilane to improve the density of carbon/ceramic composites

A technology of ceramic composite materials and polycarbosilane, which is applied in the field of carbon/ceramic composite materials, can solve the problems of high toxicity of external organic solvents, performance defects of carbon/ceramic materials, and slow curing of PCS, so as to improve impregnation effect and impregnation efficiency , low cost effect

Active Publication Date: 2022-05-03
刘旭
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the prior art that the added organic solvent is highly toxic, the heating consumes energy, and the slow solidification of PCS causes defects in the performance of the prepared carbon / ceramic material.

Method used

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  • A method for reducing the viscosity of polycarbosilane to improve the density of carbon/ceramic composites
  • A method for reducing the viscosity of polycarbosilane to improve the density of carbon/ceramic composites
  • A method for reducing the viscosity of polycarbosilane to improve the density of carbon/ceramic composites

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specific Embodiment approach 1

[0033] Embodiment 1: A method of reducing the viscosity of polycarbosilane in this embodiment to increase the density of carbon / ceramic composite materials. The method is specifically completed according to the following steps:

[0034] 1. Weighing: Measure the acetone and curing agent and place them in a beaker;

[0035] 2. Prepare a uniform mixed solution: fully stir the acetone, curing agent and polycarbosilane precursor to obtain a uniformly mixed polycarbosilane-acetone mixed solution;

[0036] 3. Impregnation of polycarbosilane-acetone mixed solution: immerse the mixed solution in the previous step into the block to be soaked;

[0037] 4. Volatile acetone: volatilize the acetone in the block by heating;

[0038] 5. Put the polycarbosilane after the acetone has completely volatilized in a vacuum blast drying oven at 180-200°C for 1-2 hours;

[0039] 6. Place the fully cured sample in a tube furnace, and crack it in an argon atmosphere with a gas flow rate of 10mL / min, a...

specific Embodiment approach 2

[0048] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the content of acetone in step 1 is 1wt.%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0049] Embodiment 3: This embodiment is different from Embodiment 1 in that the content of acetone in step 1 is 2wt.%. Others are the same as the first embodiment.

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Abstract

A method for increasing the density of carbon / ceramic composite materials by reducing the viscosity of polycarbosilane, which relates to the field of carbon / ceramic composite materials. Slow solidification occurs, which leads to defects in the properties of the prepared carbon / ceramic materials. The method of the invention is as follows: 1. weighing; 2. preparing uniform mixed solution; 3. impregnating the uniform mixed solution; 4. volatilizing acetone. The invention is easy to operate, and can reduce the viscosity of polycarbosilane from 243.0mpas to 6.0mpas by two orders of magnitude. At the same time, it can greatly reduce the porosity and pore diameter generated in the subsequent curing-cracking process of PCS. The invention is used for preparing high-density carbon / ceramic composite material.

Description

technical field [0001] The invention belongs to the field of carbon / ceramic composite materials, and specifically relates to a method for reducing the viscosity of polycarbosilane and improving impregnation efficiency in the process of preparing carbon / ceramic composite materials by PIP method. Background technique [0002] Carbon / ceramic composites have high specific strength, high specific modulus, excellent room temperature and high temperature mechanical properties, and good oxidation and ablation resistance. They are expected to become important candidate materials for high-temperature structural components such as nose cones and wing leading edges of hypersonic vehicles. . The most common materials in the carbon / ceramic composite system are carbon fiber toughened SiC or ultra-high temperature ceramic modified SiC matrix composites, and the SiC matrix phase is mainly supplied by the impregnation and cracking of polycarbosilane precursors. The traditional polycarbosilan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/84C04B35/80C04B35/565C04B35/622
CPCC04B35/571C04B35/622C04B2235/5248
Inventor 刘旭
Owner 刘旭
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