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Preparation method of carbon fiber reinforced MoSi2-SiC ceramic matrix composite

A composite material and ceramic matrix technology, which is applied in the field of preparation of carbon fiber reinforced MoSi2-SiC ceramic matrix composite materials, can solve the problems of decreased fiber reinforcement strength, low matrix densification speed, low composite material stability, etc., and achieves increased density. , low cost, improve the effect of interface combination

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Problems solved by technology

Precursor impregnation cracking method has a long cycle of multiple impregnation processes, which is prone to shrinkage cracks and high cost (2009)3438–3443.], the matrix densification rate of the composite material prepared by chemical vapor infiltration method is low, the production cycle is long, and the stability of the composite material is low [J.Yin, H.B. Zhang, X. Xiong, J. Zuo, H.J. Tao, Ablation properties of C / C–SiC composite tested on an archeater, Solid State Sci.13(2011) 2055–2059.], the composite material prepared by traditional fusion siliconizing method tends to have residual Si and reduce the strength of fiber reinforcement [SeYoungKim, et al. Wear-mechanical properties of filler-added liquid silicon infiltrationC / C-Si C composites Materials and Design [J], 44(2013) 107-113.]

Method used

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  • Preparation method of carbon fiber reinforced MoSi2-SiC ceramic matrix composite
  • Preparation method of carbon fiber reinforced MoSi2-SiC ceramic matrix composite

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1) Choose commercially available molybdenum disilicide powder (after wet ball milling for 48 hours, the average particle size is 0.8-1 μm), Si-Mo alloy powder (after wet ball milling for 24 hours, the average particle size is 1-2 μm), Al 2 o 3 The powder has been wet ball milled for 24 hours, the average particle size is 100-200nm), low-density C / C composite material (density is about 0.5g / cm 3 ), glucose (purity ≥ 99%) is raw material;

[0027] 2) According to mass percentage, 80% of molybdenum disilicide powder with an average particle size of 0.8-1 μm, 16% of Si-Mo alloy with an average particle size of 1-2 μm, and 4% of an average particle size of 100-200nm Al 2 o 3 The powders were mixed, and mixed with a planetary ball mill for 6 hours, and the speed of the ball mill was set at 440 rpm;

[0028] 3) Set the density to 0.4g / cm 3 The porous carbon / carbon composite material (Jiangsu Tianniao High-tech Co., Ltd.) was cut into circular sheets with a diameter of 1 c...

Embodiment 2

[0035] 1) Choose commercially available molybdenum disilicide powder (after wet ball milling for 48 hours, the average particle size is controlled at 0.8-1 μm), Si-Mo alloy powder (after wet ball milling for 24 hours, the average particle size is controlled at 1-2 μm), Al 2 o 3 The powder is wet ball milled for 24 hours, the average particle size is controlled at 100-200nm), and the low-density C / C composite material (density is about 0.5g / cm 3 ), glucose (purity ≥ 99%) is raw material;

[0036] 2) According to mass percentage, 60% of molybdenum disilicide powder with an average particle size of 0.8-1 μm, 32% of Si-Mo alloy powder with an average particle size of 1-2 μm, and 8% with an average particle size of 100 -200nm Al 2 o 3 The powders were mixed, and mixed for 3 hours with a planetary ball mill, and the speed of the ball mill was set at 500 rpm;

[0037] 3) Set the density to 0.8g / cm 3 The porous carbon / carbon composite material is cut into circular slices with a ...

Embodiment 3

[0044] 1) Choose commercially available molybdenum disilicide powder (after wet ball milling for 48 hours, the average particle size is controlled at 0.8-1 μm), Si-Mo alloy powder (after wet ball milling for 24 hours, the average particle size is controlled at 1-2 μm), Al 2 o 3 The powder is wet ball milled for 24 hours, the average particle size is controlled at 100-200nm), and the low-density C / C composite material (density is about 0.5g / cm 3 ), glucose (purity ≥ 99%) is raw material;

[0045] 2) According to mass percentage, 70% of molybdenum disilicide powder with an average particle size of 0.8-1 μm, 25% of Si-Mo alloy powder with an average particle size of 1-2 μm, and 5% with an average particle size of 100 -200nm Al 2 o 3 The powders were mixed, and mixed with a planetary ball mill for 3 hours, and the speed of the ball mill was set at 540 rpm;

[0046] 3) Set the density to 0.6g / cm 3 The porous carbon / carbon composite material is cut into circular slices with a ...

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Abstract

A preparation method of a carbon fiber reinforced MoSi2-SiC ceramic matrix composite comprises steps as follows: evenly mixing molybdenum disilicide powder, Si-Mo powder and Al2O3 powder to obtain mixed powder; cutting a porous C / C composite with the density of 0.4-0.8 g / cm<3> into round slices; placing the round slices into a graphite crucible, covering the round slices with the mixed powder, placing the round slices into a glucose aqueous solution for hydrothermal treatment after heat treatment, repeating hydrothermal treatment until the density reaches 1.2-1.5 g / cm<3>, and finally performing carbonization treatment to obtain the carbon fiber reinforced MoSi2-SiC ceramic matrix composite. The prepared C / C-MoSi2-SiC ceramic matrix composite has medium density, compact surface structure and good interface bonding, and the composite with high strength and good high-temperature oxidation and ablation resistance can be obtained at the low temperature.

Description

technical field [0001] The invention belongs to the technical field of C / C composite materials, and relates to a carbon fiber reinforced MoSi 2 - A method for preparing a SiC ceramic matrix composite material. Background technique [0002] Carbon / carbon (C / C) composites are currently the only high-temperature composite materials that can be applied at 2800 °C. Due to their excellent properties, they have broad application prospects in the aerospace field, such as low thermal expansion coefficient, low density, and High temperature, ablation resistance, high strength, high modulus and other excellent properties, especially the excellent properties that the strength and modulus increase with the increase of temperature under the condition of inert atmosphere within 2200 °C. However, C / C composites will be oxidized in an aerobic environment exceeding 370 °C, and the loss of oxidized mass will lead to a decrease in its strength, which limits its application range, especially in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/84C04B35/83C04B35/58C04B35/622
CPCC04B35/58092C04B35/622C04B35/83C04B2235/3217C04B2235/3826C04B2235/48
Inventor 曹丽云白喆黄剑锋欧阳海波李翠艳孔新刚费杰卢靖王程李嘉胤介燕妮
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