A kind of sic/zrc composite fiber and its preparation method and use

A composite fiber and polymer technology, applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of complex preparation process, low fracture strength, harsh conditions, etc., and achieve short preparation process and excellent tensile strength Strong, easy-to-industrialize effect

Active Publication Date: 2022-07-19
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, by limiting the amount of polymethacrylate, polyethylene glycol, ethanol and n-octanol, the surface of the prepared cast sheet is smooth and free of bubbles; Controlled and limited, the prepared layered ultra-high temperature ceramics have a clear interface, good compactness of the ceramics, and can change the crack propagation path to enhance the fracture toughness, but the preparation process of the method is complicated, the conditions are harsh, and the yield is low; the carbonization The strength of silicon / zirconium carbide ceramics is low, and the fracture strength of the silicon carbide layer and the zirconium carbide layer are inconsistent and poor in uniformity, resulting in low fracture strength

Method used

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  • A kind of sic/zrc composite fiber and its preparation method and use
  • A kind of sic/zrc composite fiber and its preparation method and use
  • A kind of sic/zrc composite fiber and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0048] This embodiment provides a preparation method of SiC / ZrC composite fiber, and the method includes the following steps:

[0049] (1) At 18°C, a hybrid spinning solution of liquid polycarbosilane and polyzirconoxane was prepared in a mass ratio of 3:1, and fully magnetically stirred for 3 h to obtain a hybrid spinning solution with a viscosity of 4.8 Pa·s;

[0050] (2) After the hybrid spinning solution obtained in step (1) is loaded into a glass syringe, electrospinning is performed under the conditions of an output voltage of 15kV, an injection flow rate of 2.5mL / h, and a flat aluminum foil take-up distance of 10cm, and spinning for 6 hours. Then, the SiC / ZrC composite fiber precursor was obtained;

[0051] (3) The SiC / ZrC composite fiber precursor obtained in step (2) was heated to 120°C for 3 h at a rate of 2°C / min under an argon atmosphere, and finally, under the protection of argon, the temperature was 5°C / min. The temperature was increased to 1600°C for 2 hours, a...

Embodiment 2

[0057] This embodiment provides a preparation method of SiC / ZrC composite fiber, and the method includes the following steps:

[0058] (1) At 20°C, a hybrid spinning solution of liquid polycarbosilane and zirconium acetylacetonate was prepared in a mass ratio of 3.5:1, and fully magnetically stirred for 4 h to obtain a hybrid spinning solution with a viscosity of 3.4 Pa·s;

[0059] (2) After loading the hybrid spinning solution obtained in step (1) into a glass syringe, electrospinning was performed under the conditions of an output voltage of 15kV, an injection flow rate of 2mL / h, and a flat aluminum foil collection distance of 15cm. After spinning for 5h , to obtain SiC / ZrC composite fiber precursor;

[0060] (3) The SiC / ZrC composite fiber precursor obtained in step (2) was heated to 140°C for 2 h at a rate of 2°C / min under an argon atmosphere, and finally, under the protection of argon, the temperature was 5°C / min. The temperature was increased to 1550°C for 2 hours, and ...

Embodiment 3

[0063] This embodiment provides a preparation method of SiC / ZrC composite fiber, and the method includes the following steps:

[0064] (1) At 22 °C, a hybrid spinning solution of liquid polycarbosilane and polyziroxane was prepared in a mass ratio of 4:1, and fully magnetically stirred for 2 h to obtain a hybrid spinning solution with a viscosity of 2.1 Pa·s;

[0065] (2) After the hybrid spinning solution obtained in step (1) is loaded into a glass syringe, electrospinning is performed under the conditions of an output voltage of 15kV, an injection flow rate of 1.5mL / h, and a flat aluminum foil receiving distance of 10cm, and spinning for 5h. Then, the SiC / ZrC composite fiber precursor was obtained;

[0066] (3) The SiC / ZrC composite fiber precursor obtained in step (2) was heated to 120°C for 3 hours at a rate of 5°C / min under an argon atmosphere, and finally, under the protection of argon, the temperature was 8°C / min. The temperature was increased to 1500°C for 3 hours, an...

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Abstract

The invention relates to a SiC / ZrC composite fiber and its preparation method and application. The diameter of the SiC / ZrC composite fiber is 10-70 μm. The method includes the following steps: (1) mixing liquid polycarbosilane with a zirconium-containing polymer to obtain a hybrid spinning solution, and then performing electrospinning to obtain a SiC / ZrC composite fiber precursor; (2) combining step ( 1) The obtained SiC / ZrC composite fiber precursor is cross-linked and heat-treated in a protective atmosphere to obtain the SiC / ZrC composite fiber. The SiC / ZrC composite fiber is continuous and uniform, the diameter can be adjusted, has excellent tensile strength and breaking strength, and excellent high temperature resistance; the method does not use organic solvents and spinning aids, and has a short process flow and high yield. Has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a SiC / ZrC composite fiber and a preparation method and application thereof. Background technique [0002] As one of the ultra-high temperature ceramic materials, zirconium carbide (ZrC) is considered to be the most potential thermal protection material for supersonic aircraft and solar thermoelectric receiver due to its high hardness and melting point, good chemical stability and radiation resistance. and nuclear fuel cladding materials. However, ZrC material is brittle, which leads to its poor thermal shock resistance and is prone to failure during rapid heating, resulting in catastrophic failure. Therefore, strengthening the ZrC matrix can effectively overcome the shortcomings of ZrC ceramics such as poor toughness and low reliability, and obtain ZrC ceramic materials with high reliability, oxidation resistance and toughness, which has received extensive attention....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01F8/18D01D5/00
CPCD01F9/10D01F8/18D01D5/0007D01D5/003D01D5/0061C04B2235/483C04B2235/5264C04B35/62277C04B35/62281C04B35/6325C04B35/6269C04B35/5622C04B35/571C04B2235/5244D01F1/10D01F9/08
Inventor 王晓飞朱明余李玉磊许佼赵予生
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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