Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for preparing continuous silicon carbide fiber containing aluminium

A silicon carbide fiber, polyaluminum carbosilane technology is applied in the chemical characteristics of fibers, rayon manufacturing, textiles and paper making, etc., to achieve the effects of stable performance, excellent process repeatability and simple preparation process

Active Publication Date: 2007-08-08
NAT UNIV OF DEFENSE TECH +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And polyaluminocarbosilane fibrils were prepared by porous melt spinning or dry spinning

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for preparing continuous silicon carbide fiber containing aluminium
  • Process for preparing continuous silicon carbide fiber containing aluminium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dimethyldichlorosilane and methylhydrogendichlorosilane are added to 3 times of toluene solvent in a weight ratio of 96:4, and polydimethylsilane-polymethylhydrogensilane copolymer is generated under the action of excess metal sodium (95:5). This copolymer and aluminum acetylacetonate were mixed in a weight ratio of 1:0.08. After reacting at 370°C and 580°C, the number average molecular weight of the synthesized polyaluminocarbosilane is 2300. Polyaluminocarbosilane fibrils with a diameter of 12.5 microns can be prepared by melt spinning the above polyaluminocarbosilane. Polyaluminocarbosilane fibrils do not melt in air at 180°C, and infusible polyaluminacarbosilane fibers with an oxygen content of 10% can be prepared. The above non-melting polyaluminocarbosilane fiber can be continuously fired at 1250°C and sintered at 1700°C to produce Si-Al-C continuous fiber with a strength of 2.4GPa and an aluminum content of 0.9%. The properties of the fibers are shown in Figur...

Embodiment 2

[0018] Example 2: Dimethyldichlorosilane was added to 3 times of toluene solvent, and polydimethylsilane was generated under the action of excess metal sodium. The ratio of polydimethylsilane and aluminum isopropoxide mixture is 1:0.04. After the reaction at 420°C and 530°C respectively, the number average molecular weight of the synthesized polyaluminocarbosilane is 2500. Polyaluminocarbosilane fibrils with a diameter of 15 microns can be prepared by melt spinning the above polyaluminocarbosilane. Polyaluminocarbosilane fibrils do not melt in air at 190°C, and infusible polyaluminacarbosilane fibers with an oxygen content of 12% can be prepared. The above-mentioned non-melting polyaluminocarbosilane fibers are fired at 1400°C to produce Si-Al-C-O fibers with a strength of 2.5 GPa and an aluminum content of 0.7%.

Embodiment 3

[0019] Example 3: Dimethyldichlorosilane was added to 3 times of toluene solvent, and polydimethylsilane was generated under the action of excess metal sodium. The ratio of the mixture of polydimethylsilane and aluminum acetylacetonate is 1:0.06. After the reaction at 420°C and 450°C respectively, the number average molecular weight of the synthesized polyaluminocarbosilane is 3500. Polyaluminocarbosilane fibrils with a diameter of 13.5 microns can be prepared by melt spinning the above polyaluminocarbosilane. Polyaluminocarbosilane fibrils do not melt in air at 210°C, and infusible polyaluminocarbosilane fibers with an oxygen content of 15% can be prepared. The above-mentioned non-melting polyaluminocarbosilane fibers are fired at 1500°C to produce Si-Al-C-O fibers with a strength of 2.2GPa and an aluminum content of 0.9%.

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
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
strengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The preparation process of continuous silicon carbide fiber containing aluminum includes: reacting polysilane or silane copolymer with Si-Si main chain and organic aluminum complex to synthesize aluminocarbon silane polymer; continuous spinning to obtain aluminocarbon silane polymer fiber; air infusible treatment of the fiber to obtain infusible aluminocarbon silane polymer fiber; and continuous baking or sintering of the infusible aluminocarbon silane polymer fiber to obtain the continuous silicon carbide fiber containing aluminum. The continuous silicon carbide fiber containing aluminum is flexible, black and bright, and has average diameter of 5-16 micron, average drafting strength of 1.5-3.5 GPa and elastic modulus of 200-430 GPa. It has aluminum content of 0.1-5 %, and has excellent super high temperature resistance, high temperature oxidation resistance and high temperature creepage performance, high stability and technological repeatability.

Description

technical field [0001] The invention relates to composite materials that can be applied to high temperature resistance, or composite materials that need to withstand high temperatures during the preparation process (such as aerospace vehicle structural parts, high temperature engine parts, nuclear protection materials, catalysts, heat exchange systems and combustion systems, etc.) The ultra-high temperature resistant reinforcing fiber - the preparation method of aluminum-containing continuous silicon carbide fiber. Background technique [0002] Generally, continuous silicon carbide fibers with fine diameters are prepared by the method of precursor polymers. The commonly used precursor polymer is polycarbosilane, but the general-purpose silicon carbide fiber prepared by polycarbosilane begins to decrease in strength after 1000 °C. In order to improve the high temperature resistance of the fiber, technologies such as electron radiation are generally used to increase the tempe...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08D01F1/10
Inventor 李效东王应德曹峰王军邹治春张卫中王海玉
Owner NAT UNIV OF DEFENSE TECH