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Preparation method of sheet-shaped C/C-MoSi2 composite

A composite material and sheet-like technology, which is applied in the field of preparation of sheet-like C/C-MoSi2 composite materials, can solve the problems of decreased strength of fiber reinforcements, low mechanical properties of composite materials, low stability of composite materials, etc. junction strength, improved interfacial bonding, and low cost effects

Active Publication Date: 2015-12-30
博兴瑞峰新材料有限公司
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  • Summary
  • Abstract
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AI Technical Summary

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 209(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.Zhng, X.Xiong, J.Zuo, H.J.To, bltion properties of C / C–SiCcompositestestedonnrcheter, SolidStteSci.13(2011)2055–2059.], composite materials prepared by fusion siliconizing method tend to reduce the strength of fiber reinforcement, and the cost is too high [SeYoungKim, etl.Wer-mechniclpropertiesoffiller -ddedliquidsiliconinfiltrtionC / C–SiCcompositesMterilsndDesign[J],44(2013)107–113.], and the composite material prepared by reactive melt impregnation method has great damage to the carbon fiber, resulting in low mechanical properties and poor fracture toughness of the composite material[Z.Q.Li , H.J.Li, S.Y.Zhng, J.Wng, W.Li, F.J.Sun, Effectorefectionmeltinfiltrtiontemperatureonthebltionpropertiesof2DC / C–SiC–ZrCcomposites, Corros.Sci.58(2012)12–19.]
And the method that adopts vacuum filtration-homogeneous hydrothermal method to prepare carbon / carbon-high temperature resistant ceramic composite material has not yet been reported

Method used

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  • Preparation method of sheet-shaped C/C-MoSi2 composite
  • Preparation method of sheet-shaped C/C-MoSi2 composite
  • Preparation method of sheet-shaped C/C-MoSi2 composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Select commercially available molybdenum disilicide powder (after dry ball milling for 24 hours, the average particle size is controlled at 1-3 μm), isopropanol (purity ≥ 99.8%), glucose (purity ≥ 99%) as raw materials;

[0033] 2) First, take an appropriate amount of molybdenum disilicide powder 6g and disperse it in 150mL of isopropanol to prepare a mixture with a concentration of 40g / L. The mixture is ultrasonically oscillated (ultrasonic power is 800W) for 50min, and then placed on a magnetic stirrer and stirred for 2h , to get a suspension;

[0034] 3) Set the density to 0.2g / cm 3 The carbon fiber three-dimensional fabric (manufacturer: Jiangsu Tianniao High-tech Co., Ltd.) is cut into discs with a diameter of 3 cm and a thickness of 0.5 cm;

[0035] 4) Place the disc in 0.5mol / L glucose solution for 180°C homogeneous hydrothermal treatment for 6 hours, deposit a carbon layer on the carbon fiber to protect the fiber, and increase the density to obtain a C / C sam...

Embodiment 2

[0042] 2) First, take an appropriate amount of molybdenum disilicide powder 5.25g and disperse it in 150mL of isopropanol to prepare a mixture with a concentration of 35g / L. The mixture is ultrasonically oscillated (ultrasonic power is 800W) for 30min, and then placed on a magnetic stirrer for stirring 2h, the suspension was obtained;

[0043] 3) Set the density to 0.3g / cm 3 The carbon fiber three-dimensional fabric (manufacturer: Jiangsu Tianniao High-tech Co., Ltd.) is cut into discs with a diameter of 4cm and a thickness of 1cm;

[0044] 4) Place the wafer in 0.75mol / L glucose solution for 200°C homogeneous hydrothermal treatment for 6 hours, deposit a carbon layer on the carbon fiber to protect the fiber and increase the density to obtain a C / C sample;

[0045] 5) Place the C / C sample prepared in step 4) flat in the glass sand core suction filter device, then pour the suspension into a vacuum filter flat-bottomed funnel, and perform suction filtration. The vacuum pump pum...

Embodiment 3

[0050] 1) Select commercially available molybdenum disilicide powder (after dry ball milling for 24 hours, the average particle size is controlled at 1-3 μm), isopropanol (purity ≥ 99.8%), glucose (purity ≥ 99%) as raw materials;

[0051] 2) First, take an appropriate amount of molybdenum disilicide powder 6.75g and disperse it in 150mL of isopropanol, and prepare a mixture with a concentration of 45g / L. The suspension is ultrasonically oscillated (ultrasonic power is 800W) for 50min, and then placed on a magnetic stirrer Stir for 2h to obtain a suspension;

[0052] 3) Set the density to 0.4g / cm 3 The carbon fiber three-dimensional fabric is cut into discs with a diameter of 3cm and a thickness of 2cm;

[0053] 4) Place the disc in 0.5mol / L glucose solution for 190°C homogeneous hydrothermal treatment for 8 hours, deposit a carbon layer on the carbon fiber to protect the fiber, and increase the density to a certain extent to obtain a C / C sample;

[0054] 5) Place the C / C sam...

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Abstract

The invention provides a preparation method of a sheet-shaped C / C-MoSi2 composite. The method includes the steps of conducting ultrasonic oscillation and stirring to obtain suspension liquid after molybdenum disilicide powder is dispersed in isopropanol, increasing the density of carbon fiber three-dimensional fabric through a hydrothermal glucose osmosis, placing the carbon fiber three-dimensional fabric in a glass sand core pumping filtration device, pouring the suspension liquid in a pumping filtration flat-bottom funnel so that all the suspension liquid can completely penetrate through a C / C composite, placing a sample in a glucose solution to be subjected to a homogeneous phase hydrothermal reaction so that the density of the composite can be further increased, taking out the sample after the reaction to be dried, and finally conducting thermal treatment. The prepared C / C-MoSi2 composite is moderate in density and compact in structure, and the interfaces of C / C and MoSi2 are well bonded. The C / C-MoSi2 composite good in performance can be obtained at a low temperature; experiment raw materials are easy to obtain, the preparation process is simple, operation is easy and convenient, cost is low, and the preparation method is friendly to the environment and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of C / C composite materials, and relates to a preparation method of thin-sheet C / C-MoSi2 composite materials. 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 high temperature or humid environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/83
Inventor 曹丽云白喆欧阳海波黄剑锋李翠艳孔新刚
Owner 博兴瑞峰新材料有限公司
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