Preparation method for flexible polycrystalline silicon carbide micro-nanofiber mat

A technology of micro-nano fiber and silicon carbide, which is applied in the direction of heating/cooling fabrics, textiles and papermaking, fabric surface trimming, etc., can solve the problems of unusable, high temperature resistance not exceeding 1000 °C, etc., and achieve small diameter and easy processing and use , The effect of mild spinning conditions

Inactive Publication Date: 2013-09-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yang Daxiang, Sun Dongfei and others used this method to prepare amorphous amorphous SiC submicron fibers, but the high temperature resistance of the SiC submicron fibers does not exceed 1000 ° C, especially cannot be used in high temperature air atmosphere

Method used

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  • Preparation method for flexible polycrystalline silicon carbide micro-nanofiber mat
  • Preparation method for flexible polycrystalline silicon carbide micro-nanofiber mat
  • Preparation method for flexible polycrystalline silicon carbide micro-nanofiber mat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mixed solvents of xylene, tetrahydrofuran and dimethylformamide were prepared at a volume ratio of 3:1:1. Add 5.0 g of polyaluminocarbosilane into 5.0 mL of the mixed solvent and stir thoroughly for 6 h to obtain a polyaluminocarbosilane solution with a concentration of 1.0 g / mL. After filling the solution into a glass syringe, the spinneret is an 8# metal needle, and the output voltage is 20kV, the injection flow rate is 2.0mL / h, and the roller acceptance distance is 8cm, and the electrospinning is carried out at room temperature. After spinning for 2 hours The polyaluminocarbosilane fiber felt was obtained; then dried at 50°C for 2 hours, heated to 200°C in air for 2 hours to cross-link, and finally pyrolyzed and sintered at 1800°C for 20 minutes in a high-purity nitrogen atmosphere to obtain a flexible multi- Crystalline silicon carbide micro-nano fiber mat, the fiber diameter is uniformly distributed around 1.5μm. The physical picture of the flexible polyaluminocar...

Embodiment 2

[0023] Prepare a mixed solvent of xylene and dimethylformamide at a volume ratio of 7:3. Add 4.5 g of polyaluminocarbosilane into 5 mL of the mixed solvent and stir thoroughly for 4 h to obtain a polyaluminocarbosilane solution with a concentration of 0.9 g / mL. After putting the solution into a glass syringe, the spinneret was a 8# metal needle, and the electrospinning was carried out at an output voltage of 20kV, an injection flow rate of 2.0mL / h, a flat aluminum foil collection distance of 10cm, and room temperature. After spinning for 3 hours, poly Aluminocarbosilane fiber felt; then, dry the fiber felt at 50°C for 2 hours, heat it up to 180°C in the air for 3 hours to cross-link; finally carry out pyrolysis and sintering treatment at 1750°C for 30 minutes in a high-purity nitrogen atmosphere to obtain a flexible multi- Crystalline silicon carbide micro-nano fiber mat.

Embodiment 3

[0025] Prepare a mixed solvent of toluene, acetone and ethanol at a volume ratio of 3:1:1. Weigh 6.0 g of polyborocarbosilane and add it into 5.0 mL of mixed solvent and stir thoroughly for 6 h to obtain a polyborocarbosilane solution with a concentration of 1.2 g / mL. After putting the solution into a glass syringe, the spinneret is a 12# metal needle, and the output voltage is 25kV, the injection flow rate is 2.0mL / h, and the receiving distance of the drum is 12cm, and the electrospinning is carried out at room temperature, and the spinning is 2.5h Finally, the polyborocarbosilane fiber felt is obtained; then it is dried at 50°C for 2 hours, heated to 200°C in air for 2 hours for cross-linking, and finally pyrolyzed and sintered at 1800°C for 30 minutes in a high-purity nitrogen atmosphere to obtain a flexible fiber mat. Polycrystalline silicon carbide micro-nano fiber mat.

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Abstract

The invention provides a preparation method for a flexible polycrystalline silicon carbide micro-nanofiber mat, and relates to silicon carbide fiber mats. The flexible polycrystalline silicon carbide micro-nanofiber mat is good in flexibility, and has chalking resistance at the temperature higher than 160 DEG C, the fiber diameter is 1.5micrometer around, strength is larger than modulus, cutting and processing are facilitated, the preparation method is controllable, art is simple, and the flexible polycrystalline silicon carbide micro-nanofiber mat is adaptable to continuous and large-scale preparation. The method includes 1, dissolving polycarbosilane containing heterogeneous elements in pre-prepared spinning solvent, and obtaining precursor spinning solution; 2, performing electrostatic spinning of the precursor spinning solution prepared in the step 1 through an electrostatic spinning machine, and obtaining a precursor fiber mat; 3, drying the precursor fiber mat obtained in the step 2, then performing oxidation crosslinking immediately; after heat insulating, pyrolyzing and calcining in an inert atmosphere, and obtaining the flexible polycrystalline silicon carbide micro-nanofiber mat.

Description

technical field [0001] The invention relates to a silicon carbide fiber felt, in particular to a method for preparing a flexible polycrystalline silicon carbide micro-nano fiber felt with ultra-high temperature resistance and a fiber diameter of micro-nano level. Background technique [0002] Silicon carbide (SiC) fibers prepared from polycarbosilane (PCS) precursors, regardless of their purity, can form high-purity β-SiC crystals at high temperatures. As the temperature further increases, β-SiC crystallites It grows up, causing SiC fiber pulverization, which seriously affects its high-temperature mechanical properties. In order to prepare SiC fibers with excellent comprehensive properties, a lot of research has been devoted to physical or chemical modification of SiC precursors. By introducing heterogeneous elements, especially heterogeneous elements such as aluminum, boron, yttrium, zirconium, titanium, and iron, Inhibit the growth of SiC grains during high-temperature si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4326D04H1/728D06C7/04
Inventor 余煜玺陈勇
Owner XIAMEN UNIV
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