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SiC fiber and fabric and preparation method thereof

A fabric and fiber technology, applied to SiC fibers or fabrics using natural plant fibers or their fabrics as templates and their preparation, in the field of SiC fibers or fabrics and their preparation, can solve the problems of environmental pollution, mercury poisoning, high cost, and achieve fabrics. Uniform vertical and horizontal properties, simple and convenient preparation method, and environment-friendly effects

Inactive Publication Date: 2011-08-24
国际竹藤网络中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the preparation method of the precursor conversion method is complicated, the product performance is not easy to control, and the cost is high
Mercury vapor in the chemical vapor deposition method is likely to cause mercury poisoning of the operator at work and cause environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 SiC fiber and its preparation method

[0029] 1. The SiC fiber of this example: the ramie fiber is used as a template.

[0030] 2. The preparation method of the SiC fiber of this example:

[0031] (1) The above ramie fibers were carbonized at 900° C. for 2 hours under the protection of nitrogen to prepare ramie carbon fibers. The heating program is: 1°C / min between 0°C and 350°C, and 5°C / min between 350°C and 900°C.

[0032] (2) Preparation of silica sol with ethyl orthosilicate as precursor, the molar ratio of ethyl orthosilicate: ethanol: water is 1:4:32, 1:4:16, 1:4:8 respectively , 1:4:4 and 1:4:2. The pH value of the sol was adjusted to 2.5 with hydrochloric acid with a concentration of 1 mol / L, and colorless transparent silica sols with different concentrations were produced after stirring for 30 minutes.

[0033](3) The silicon dioxide sol was impregnated into the ramie carbon fiber sequentially in the order of concentration from small to large by m...

Embodiment 2

[0035] Embodiment 2 SiC fiber fabric and its preparation method

[0036] 1. The SiC fiber fabric of this example: take the natural bamboo fiber fabric as a template. Prepare the natural bamboo fiber fabric that width is 20mm * 150mm as required.

[0037] 2. The preparation method of the SiC fiber fabric of this example:

[0038] (1) Preparation of silica sol with methyltriethoxysilane as precursor, the molar ratio of methyltriethoxysilane: isopropanol: water is 1:4:32, 1:4:16 respectively , 1:4:8, 1:4:4 and 1:4:2. The pH value of the sol was adjusted to 2 with hydrochloric acid with a concentration of 1 mol / L, and colorless transparent silica sols with different concentrations were prepared after stirring for 60 minutes.

[0039] (2) Soak the natural bamboo fiber fabric in ethylene glycol for 6 hours. The silicon dioxide sol is sequentially impregnated into the natural bamboo fiber fabric in the order of concentration from small to large by means of vacuum pressure. That ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The invention relates to an SiC fiber or fabric and a preparation method thereof and belongs to the technical field of composite materials. By taking natural vegetable fiber or the fabric thereof as the template, the SiC fiber or fabric is obtained through impregnation in silica sol and high-temperature calcination. The preparation method includes the following steps: impregnating silica sol in natural vegetable fiber or fabric thereof carbonized or pretreated by organic expanding agent by adopting a vacuum or vacuum pressure way or the vacuum or vacuum pressure way simultaneously combined with a concentration gradient diffusion way to achieve 75-166 percent of weight gain rate, and then under protective gas, calcining the obtained material at the temperature of 1400-1600 DEG C for 1.5-4h, and converting the obtained material into complete SiC fiber or fabric. The SiC fiber or fabric not only completely maintains the structure of natural vegetable fiber, but also is characterized by high strength, high-temperature thermostability and resistance to acid and alkali corrosion of SiC material. Meanwhile, the SiC fiber or fabric is also characterized by vertical and horizontal performance uniformity of fabrics and very suitably used as the enhanced phase of in-plane equidirectional composite material of high performance.

Description

technical field [0001] The invention relates to a SiC fiber or fabric and a preparation method thereof, belonging to the technical field of composite materials, in particular to a SiC fiber or fabric using natural plant fiber or its fabric as a template and a preparation method thereof. Background technique [0002] SiC fiber has excellent mechanical properties, high temperature resistance, corrosion resistance, oxidation resistance and aging resistance, and is widely used in high-tech fields such as atomic energy, weapons, aerospace, etc. Excellent reinforcement materials play an important role in the development of my country's advanced composite materials industry. [0003] At present, SiC fiber composites mainly use artificial organic compounds or artificial fibers as raw materials or precursors, and their preparation methods include chemical vapor deposition, carbon fiber conversion, precursor conversion and ultrafine powder methods. Among them, the most widely studied ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08D06M13/148D06M13/268D06M13/402D06M11/79D06M101/06
Inventor 余雁江泽慧刘冬田根林
Owner 国际竹藤网络中心
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