Micro-pore silicon carbide fiber and preparing method thereof

A microporous silicon carbide and fiber technology, applied in spinning solution preparation, fiber chemical characteristics, melt spinning, etc., can solve the problems of low specific surface area, difficult to obtain practical application value, low fiber specific surface area, etc. The effect of high and wide practical application value

Inactive Publication Date: 2009-12-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​ceramic silicon carbide ceramic materials in these reports is low (2 / g), especially the specific surface of the fiber is extremely low (2 / g), it is difficult to obtain practical application value

Method used

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  • Micro-pore silicon carbide fiber and preparing method thereof
  • Micro-pore silicon carbide fiber and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The Si content of the microporous silicon carbide fiber of this embodiment is 55wt%, the C content is 31wt%, and the O content is 14wt%. figure 1 As shown, the fiber pore size distribution is as figure 2 As shown, the volume of micropores (pore diameter ≤ 2nm, the same below) accounts for 95vol% of the total pore volume, and the specific surface area is 2085m 2 / g, the average pore diameter is 1.72nm.

[0026] Preparation: Take 10g of PCS and 16g of phenolic aldehyde with a softening point of 180-190°C and heat and dissolve them in tetrahydrofuran, stir and mix evenly, distill off the solvent under the protection of high-purity nitrogen with a purity ≥ 99%, and place the blended precursor in In the melt spinning device, under the protection of high-purity nitrogen with a purity ≥ 99%, it is heated to 330°C and subjected to defoaming treatment, and then melt-spun at a speed of 100m / min at 280°C and 0.5MPa to obtain a raw silk ; Place the raw silk in an oxidation furna...

Embodiment 2

[0028] The Si content of the microporous silicon carbide fiber of this embodiment is 63wt%, the C content is 24wt%, the O content is 13wt%, it is in the form of continuous fibers, the micropore volume accounts for 88vol% of the total pore volume, and the specific surface area is 1200m 2 / g, the average pore diameter is 1.25nm.

[0029] Preparation: The only difference from Example 1 is that 10 g of PCS and 3 g of phenolic aldehyde with a softening point of 180-190° C. are blended as raw materials.

Embodiment 3

[0031] The Si content of the microporous silicon carbide fiber of this embodiment is 48wt%, the C content is 38wt%, the O content is 14wt%, and it is in the form of continuous fibers. The micropore volume accounts for 89vol% of the total pore volume, and the specific surface area is 1609m 2 / g, the average pore diameter is 1.95nm.

[0032] Preparation: The only difference from Example 1 is that 10 g of PCS and 25 g of phenolic aldehyde with a softening point of 180-190° C. are blended as raw materials.

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Abstract

Microporous silicon carbide fiber and method for preparing same. The microporous silicon carbide fiber is characterized in that the Si content is 40-65wt%, the C content is 25-45wt%, and the balance is O, in the form of continuous fibers, and the volume of micropores (pore diameter≤2nm) accounts for 85vol% of the total pore volume Above, the average pore diameter is 1.30-2.00nm, and the specific surface area is 1100-2100m2 / g. The preparation method is characterized in that the C-rich silicon carbide fiber is firstly prepared by polycarbosilane and carbonaceous polymer blend spinning, non-melting, and cracking, and then the microporous silicon carbide fiber is obtained by activating the C removal process. The microporous silicon carbide fiber of the present invention has high micropore volume content, stable pore size, is not easy to collapse, high specific surface area, high temperature resistance, good oxidation resistance, and has good applications in the fields of environmental management, energy storage, medicine and health, etc. prospect.

Description

technical field [0001] The invention relates to a microporous material and a preparation method thereof, in particular to a microporous silicon carbide fiber and a preparation method thereof. Background technique [0002] Macroporous and mesoporous materials are mainly used as catalyst carriers, filtering macromolecular substances, heat insulation, heat preservation, and sound insulation materials, etc., while microporous materials are mostly used in the fields of adsorption, separation of small molecular substances, and energy storage. Microporous materials are It has been a research hotspot in recent years and has high hopes in the fields of environmental governance, medicine and health, and energy storage. [0003] Inorganic non-metallic microporous materials have become the focus of research due to their good stability, temperature resistance and corrosion resistance. Among them, the most researched microporous materials are mainly carbon materials, such as super activat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01D1/02D01D5/08D01D10/02
Inventor 楚增勇王应德赫荣安程海峰张晓宾李效东
Owner NAT UNIV OF DEFENSE TECH
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