Preparation method for lamellar C/C-SiC-MoSi2 ceramic matrix composite

A technology of c-sic-mosi2 and composite materials, which is applied in the field of preparation of thin-sheet C/C-SiC-MoSi2 ceramic matrix composite materials, can solve the problems of decreased strength of fiber reinforcement, low mechanical properties of composite materials, and stability of composite materials Low and other problems, to achieve the effect of increased density, good friction and wear performance, and low cost

Active Publication Date: 2015-12-09
广西自贸区见炬科技有限公司 +1
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  • Application Information

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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 fusion siliconizing method is easy to reduce the strength of fiber reinforcement, and the cost is too high [SeYoungKim, etal.Wear-mechanicalpropertiesoffiller- addedliquidsiliconinfiltrationC / C–SiCcompositesMaterialsandDesign[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.Zhang, J.Wang, W.Li, F.J.Sun, Effectofreactionmeltinfiltrationtemperatureontheablationpropertiesof2DC / C–SiC–ZrCcomposites, Corros.Sci.58(2012)12–19.]
However, the method of preparing carbon / carbon-high temperature resistant ceramic composites by hydrothermal electrophoretic deposition-homogeneous hydrothermal method has not been reported yet.

Method used

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  • Preparation method for lamellar C/C-SiC-MoSi2 ceramic matrix composite
  • Preparation method for lamellar C/C-SiC-MoSi2 ceramic matrix composite
  • Preparation method for lamellar C/C-SiC-MoSi2 ceramic matrix composite

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Experimental program
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Effect test

Embodiment 1

[0038] 1) Disperse silicon carbide powder and molybdenum disilicide powder in isopropanol respectively to obtain mixture A and mixture B. The silicon carbide powder concentration in mixture A is 15g / L, and the molybdenum disilicide concentration in mixture B is 35g / L. L. Mixture A and Mixture B were ultrasonically shaken for 60min (ultrasonic power was 800W), and then magnetically stirred for 3h to obtain suspension A and suspension B;

[0039] 2) In suspension A, suspension B, add iodine elemental substance respectively to obtain mixture A 1 , mixture B 1 , mixture A 1 , mixture B 1 The concentration of the iodine element in the medium is 5.0g / L, and the mixture A is 1 , mixture B 1 While heating to 80°C, magnetic stirring was performed for 3h to obtain suspension A. 2 , suspension B 2 ;

[0040] 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 3cm and a...

Embodiment 2

[0049] 1) Disperse silicon carbide powder and molybdenum disilicide powder in isopropanol to obtain mixtures A and B. The concentration of silicon carbide powder in mixture A is 20 g / L, and the concentration of molybdenum disilicide in mixture B is 30 g / L. The mixtures A and B were ultrasonically shaken (ultrasonic power was 800W) for 60min, and then magnetically stirred for 3h to obtain suspensions A and B;

[0050] 2) in suspension A, B, add iodine element respectively to obtain mixture A 1 , B 1 , mixture A 1 , B 1 The concentration of iodine element in the medium is 5.5g / L, and the mixture A is 1 , B 1 While heating to 80°C, magnetic stirring was performed for 3h to obtain suspension A. 2 , B 2 ;

[0051] 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;

[0052] 4) Place the disc in a 1 mol / L glucose solution for homogeneou...

Embodiment 3

[0059] 1) Dispersing silicon carbide powder and molybdenum disilicide powder in isopropanol to obtain mixtures A and B, the concentration of silicon carbide powder in mixture A is 20g / L, and the concentration of molybdenum disilicide in mixture B is 35g / L. The mixtures A and B were ultrasonically shaken for 60 min, and then magnetically stirred for 4 h to obtain suspensions A and B;

[0060] 2) in suspension A, B, add iodine element respectively to obtain mixture A 1 , B 1 , mixture A 1 , B 1 The concentration of the iodine element in the medium is 6g / L, and the mixture A is 1 , B 1 While heating to 80°C, magnetic stirring was performed for 4h to obtain suspension A. 2 , B 2 ;

[0061] 3) Set the density to 0.4g / cm 3 The carbon fiber three-dimensional fabric is cut into discs with a diameter of 5cm and a thickness of 1cm;

[0062] 4) Place the disc in a 0.8mol / L glucose solution for 180°C homogeneous hydrothermal treatment for 7h, deposit a carbon layer on the carbon ...

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Abstract

The invention provides a preparation method for a lamellar C/C-SiC-MoSi2 ceramic matrix composite. The method comprises the steps that silicon carbide powder and molybdenum disilicide powder are dispersed in isopropyl alcohol and then stirred evenly after iodine is added, and first suspension liquid and second suspension liquid is obtained; the density of a carbon-fiber three-dimensional fabric is increased by adopting the mode of hydrothermal glucose permeation, the carbon-fiber three-dimensional fabric is clamped in a specially-made hydrothermal kettle with a positive electrode and a negative electrode, then the specially-made hydrothermal kettle is placed in a drying oven for heat preservation, and then hydrothermal electrophoretic deposition is performed; homogeneous-phase hydrothermal treatment is repeatedly performed in an aqueous glucose solution until the density reaches 1.3-1.5 g/cm<3>, and then heat treatment is performed after the fabric is dried. According to the preparation method for the lamellar C/C-SiC-MoSi2 ceramic matrix composite, the prepared composite is moderate in density and compact in structure, and binding between a C/C interface and a SiC interface, binding between the SiC interface and a MoSi2 interface and binding between the C/C interface and the MoSi2 interface are good; the composite with the high strength and the good high-temperature oxidation resistance can be obtained at low temperature, and the preparation method has the advantages that the raw materials are easy to obtain, the preparation technology is simple, operation is easy and convenient, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of C / C composite materials, and relates to a flake C / C-SiC-MoSi 2 Preparation method of ceramic matrix composite material. Background technique [0002] Carbon / carbon (C / C) composites are currently the only high-temperature composites that can be used 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, high resistance It has excellent properties such as high temperature, ablation resistance, high strength and high modulus, especially the excellent properties that its strength and modulus increase with the increase of temperature under the condition of less than 2200 ℃ in an inert atmosphere. However, C / C composites are oxidized in an aerobic environment above 370 °C, and the loss of oxidative mass leads to a decrease in its strength, which limits its application range, especially in high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52
Inventor 曹丽云白喆欧阳海波黄剑锋李翠艳孔新刚
Owner 广西自贸区见炬科技有限公司
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