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Porous silicon carbide fibers and preparation method thereof

A technology of porous silicon carbide and polycarbosilane fibers, which can be used in fiber processing, spinning solution preparation, fiber chemical characteristics, etc., can solve the problem of not being able to obtain porous SiC fibers, and achieve good application prospects and high specific surface area.

Inactive Publication Date: 2010-11-03
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the solution concentration is lower than 1.3g / mL, fibers cannot be formed, and porous SiC fibers cannot be obtained.

Method used

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  • Porous silicon carbide fibers and preparation method thereof
  • Porous silicon carbide fibers and preparation method thereof
  • Porous silicon carbide fibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The Si content of the porous silicon carbide fiber of this embodiment is 55wt%, the C content is 31wt%, and the O content is 14wt%. The specific surface area is 700m 2 / g.

[0025] Preparation: (1) Dissolve 4.0g polycarbosilane in 5mL xylene to make a dilute solution with a concentration of 0.8g / mL, slowly add 3.0mL dimethyl sulfoxide dropwise while stirring to precipitate macromolecular polycarbosilane , forming an electrospinnable suspension. (2) Use a syringe pump to inject the suspension into a metal nozzle with an inner diameter of 1.0mm at the extrusion speed of 0.010mL / min for electrospinning, wherein the positive voltage applied to the metal nozzle is 30kV, and the metal nozzle and The distance between the grounded receiving aluminum plates is 25 cm, and porous polycarbosilane fibers with a diameter of about 2.0 μm are collected on the receiving plates; (3) the precursor fibers are placed in an oxidation furnace, and heated in air at 15 ° C / h heating rate to...

Embodiment 2

[0027] The Si content of the porous silicon carbide fiber of this embodiment is 55wt%, the C content is 31wt%, and the O content is 14wt%. The specific surface area is 600m 2 / g.

[0028] Preparation: The only difference from Example 1 is that in step (1), 4.0 g of polycarbosilane was dissolved in 8 mL of tetrahydrofuran to prepare a dilute solution with a concentration of 0.5 g / mL.

Embodiment 3

[0030] The Si content of the porous silicon carbide fiber of this embodiment is 55wt%, the C content is 31wt%, the O content is 14wt%, it is felt-like, the fiber average diameter is 0.5 μm, the porosity is 72vol%, and the mesopore volume is 59vol%. Surface area is 720m 2 / g.

[0031] Preparation: The only difference from Example 1 is that in step (1), 4.0 g of polycarbosilane was dissolved in 4 mL of benzene to prepare a dilute solution with a concentration of 1.0 g / mL.

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Abstract

The invention discloses porous SiC fibers and a preparation method thereof. The porous SiC fibers are characterized in that the content of Si accounts for 50-60wt%, the content of C accounts for 30-40wt%, and the balance is O, the fibers are felty, the diameter of the fibers is 0.5-2.0 mu m, the porosity is greater than 60vol%, wherein the mesopore volume is greater than 50vol%, and the specific surface area is 400-800 m<2> / g. The preparation method is characterized in that poly carbon silicon alky suspension solution which can spin electrically is prepared by utilizing a precipitation fractionation principle, electrostatic spinning of the extremely dilute carbon silicon alky solution is realized, a large number of mesopore structures are introduced, thus firstly preparing poly carbon silicon alky porous fibers, and then after non-melting and sintering, the porous SiC fibers are prepared. The porous SiC fibers have good application prospects in fields such as high-temperature catalysis, heat insulation, heat preservation, sound insulation and the like. The method has universality and can be used for realizing electrostatic spinning of extremely dilute solution of other precursor polymers and for preparing corresponding porous ceramic fibers.

Description

technical field [0001] The invention relates to a porous material and a preparation method thereof, in particular to a porous silicon carbide fiber and a preparation method thereof. Background technique [0002] Macroporous and mesoporous materials can be used in catalyst supports, filtering macromolecular substances, and heat insulation, thermal insulation, sound insulation and other fields. with alumina (Al 2 o 3 ), silicon oxide (SiO 2 ) and other materials, silicon carbide (SiC) is more suitable as a catalyst carrier, mainly because of the following advantages: ① High thermal conductivity: SiC reaches 100~200W / m℃, while Al 2 o 3 Only 20W / m°C; ②High chemical stability, corrosion resistance, and not easy to interact with active components; ③High mechanical strength, low density, not easy to break; ④Low thermal expansion rate: at 100~500°C, SiC is 3.7 ×l0 -6 / °C, while Al 2 o 3 is 7.3×l0 -6 / °C. Based on the above advantages, porous SiC has shown good development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D01D1/02D01D1/06D01D5/00D01D10/02
Inventor 楚增勇程海峰王军邢欣周永江郑文伟王应德阎佳张东玖
Owner NAT UNIV OF DEFENSE TECH
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