Preparation method for SiBNC fiber/SiBNC composite material

A composite material and fiber technology, which is applied in the field of preparation of ceramic matrix composite materials, can solve the problems of poor plastic deformation ability, high temperature creep resistance, small linear expansion coefficient and chemical corrosion resistance, and achieve high temperature resistance and excellent mechanical properties. The effect of uniformity and simple preparation process

Inactive Publication Date: 2012-10-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a structural material, SiBNC ceramics have the advantages of strong high temperature resistance, strong oxidation resistance, good high temperature creep resistance, high hardness, wear resistance, small linear expansion coefficient, and chemical corrosion resistance. The disadvantage is poor plastic deformation ability (present Brittle), can not withstand severe mechanical shock and thermal shock, thus seriously affecting its practical application

Method used

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  • Preparation method for SiBNC fiber/SiBNC composite material
  • Preparation method for SiBNC fiber/SiBNC composite material
  • Preparation method for SiBNC fiber/SiBNC composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted at a molar ratio of 1.3:2:8.5 at -40°C for 75 hours to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 10% was prepared, and the SiBNC fiber was immersed in the above solution for 1 h and then taken out. The impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 150 °C for pre-composition. Linked for 1h to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, put the mixture into the mold, and heat press at a pressure of 4 MPa and a temperature of 180 °C. Transfer the preform to the tube furnace under the protection of nitrogen atmosphere, heat it from room temperature to 60°C at a rate of 1°C / min, then feed trichlorosilane gas at a steady flow rate, and then raise the temperature a...

Embodiment 2

[0032] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted at a molar ratio of 1.65:2.5:8.75 at 20°C for 80 hours to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 30% was prepared, the SiBNC fiber was immersed in the above solution for 2 h and then taken out, and the impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 175 °C for pre-composition. Linked for 2 hours to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, put the mixture into the mold, and heat press at a pressure of 7 MPa and a temperature of 190 °C. Under the protection of nitrogen atmosphere, the preform was transferred to the tube furnace, heated from room temperature to 80°C at a rate of 1.5°C / min, and then fed with trichlorosilane gas at a steady flow rate, and the...

Embodiment 3

[0034] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted in a molar ratio of 2:3:9 at 80°C for 85h to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 50% was prepared, the SiBNC fiber was immersed in the above solution for 3 hours and then taken out, and the impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 200 °C for pre-composition. Linked for 3 hours to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, add the mixture into the mold, and heat press at a pressure of 10 MPa and a temperature of 200 °C. Transfer the preform to the tube furnace under the protection of nitrogen atmosphere, heat it from room temperature to 100°C at a rate of 2°C / min, then feed trichlorosilane gas at a steady flow rate, and then raise the temperature ...

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Abstract

The invention relates to a preparation method for a SiBNC fiber/SiBNC composite material. The preparation method for the SiBNC fiber/SiBNC composite material comprises the following steps: (1) preparing a precursor polymer by polymerizing a micromolecular monomer boron trichloride, methyl hydrogen dichlorosilane and hexamethyldisilazane; (2) pretreating the surface of the SiBNC fiber and performing pre-crosslinking with the precursor polymer; (3) performing thermoforming to obtain a prefabricated product; (4) performing infusible treatment on the prefabricated product; and (5) performing ceramic treatment at high temperature. The SiBNC fiber/SiBNC composite material prepared by the method has high density, uniform components, low porosity, high-temperature resistance and excellent mechanical performance.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic matrix composite materials, in particular to a preparation method of SiBNC fiber / SiBNC composite materials. Background technique [0002] With the rapid development of aerospace technology, research on some high-end space vehicles has been put on the agenda, especially in supersonic vehicles, atmospheric loading systems and rocket propulsion systems, etc., the demand for ultra-high temperature heat-resistant materials is more urgent. Therefore, it is necessary to further strengthen the basic research of fiber-reinforced ceramic matrix composites to lay a technical and theoretical foundation for their application in future aircraft. [0003] As a structural material, SiBNC ceramics have the advantages of strong high temperature resistance, strong oxidation resistance, good high temperature creep resistance, high hardness, wear resistance, small linear expansion coefficient, and chemical corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/515
Inventor 余木火邱显星韩克清刘振全贾军唐彬彬胡建建孙泽玉张婧牟世伟
Owner DONGHUA UNIV
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