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A preparation method for improving the strength and modulus of silicon carbide fibers

A technology of silicon carbide fiber and modulus, applied in the direction of fiber chemical characteristics, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the problem of low strength and achieve the effect of improving tensile strength and modulus

Active Publication Date: 2018-09-14
江苏赛菲新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the strength of ordinary SiC fibers is not high, and for applications such as ceramic matrix composites, higher strength and modulus are required

Method used

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  • A preparation method for improving the strength and modulus of silicon carbide fibers
  • A preparation method for improving the strength and modulus of silicon carbide fibers
  • A preparation method for improving the strength and modulus of silicon carbide fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Using dichlorodimethylsilane as raw material, sodium sand is used for dechlorination reaction to obtain polydimethylsilane, which undergoes cracking and rearrangement at a temperature above 500°C, and after 10 hours of heat preservation, conduct vacuum distillation at 320°C Remove the low-molecular-weight polymer to prepare polycarbosilane with a number-average molecular weight of 1264 and a softening point of 208°C;

[0022] (2) Put the polycarbosilane in step (1) in the melt spinning equipment, heat it under the protection of nitrogen until it is completely melted, then perform defoaming treatment, and melt at 300°C and 0.05MPa pressure at 400m / min Spinning to obtain polycarbosilane precursor;

[0023] (3) Carry out non-melting treatment to the raw silk obtained in step (2), under air atmosphere, 120 ℃, heat preservation 24 hours, under nitrogen atmosphere, 220 ℃, heat preservation 12 hours, obtain polycarbosilane non-melting fiber, non-melting The degree of melt...

Embodiment 2

[0027] (1) Using dichlorodimethylsilane as raw material, sodium sand is used for dechlorination reaction to obtain polydimethylsilane, which undergoes cracking and rearrangement at a temperature above 500°C, and after 12 hours of heat preservation, conduct vacuum distillation at 350°C Remove the low-molecular-weight polymer to prepare polycarbosilane with a number-average molecular weight of 1356 and a softening point of 215°C;

[0028] (2) Put the polycarbosilane in step (1) in the melt spinning equipment, heat it under the protection of nitrogen until it is completely melted, then perform defoaming treatment, and melt it at 310°C and 0.2MPa pressure at 500m / min Spinning to obtain polycarbosilane precursor;

[0029] (3) Carry out non-melting treatment to the raw silk obtained in step (2), under air atmosphere, 150 ℃, heat preservation 20 hours, under nitrogen atmosphere, 250 ℃, heat preservation 10 hours, obtain polycarbosilane non-melting fiber, non-melting The degree of me...

Embodiment 3

[0033] (1) Using dichlorodimethylsilane as raw material, sodium sand is used for dechlorination reaction to obtain polydimethylsilane, which undergoes cracking and rearrangement at a temperature above 500°C, and after 15 hours of heat preservation, conduct vacuum distillation at 360°C Remove the low molecular weight polymer to prepare polycarbosilane with a number average molecular weight of 1537 and a softening point of 220°C;

[0034] (2) Put the polycarbosilane in step (1) in the melt spinning equipment, heat it under the protection of nitrogen until it is completely melted, then perform defoaming treatment, and melt it at 320°C and 0.6MPa pressure at 600m / min Spinning to obtain polycarbosilane precursor;

[0035] (3) Carry out non-melting treatment to the raw silk obtained in step (2), under air atmosphere, 150 ℃, heat preservation 20 hours, under nitrogen atmosphere, 230 ℃, heat preservation 10 hours, obtain polycarbosilane non-melting fiber, non-melting The degree of me...

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Abstract

The invention discloses a preparation method for improving strength and modulus of SiC fibers. Dimethylsilyl dichloride is taken as raw materials and used for synthetizing polycarbosilane; melt spinning is performed, and polycarbosilane protofilaments are obtained; then non-melting treatment and high-temperature sintering are performed, and in the high-temperature sintering process, tension is applied, and the minus stretch ratio is controlled to be 3%-5%; finally, the SiC fibers with high strength and high modulus are prepared. The preparation method aims at further improving the strength and modulus of the common SiC fibers, and the SiC fibers meet requirements for performance of novel materials in the aerospace field.

Description

technical field [0001] The invention relates to a preparation method for improving the strength and modulus of silicon carbide fibers, and belongs to the field of preparation of high-temperature resistant ceramic fibers. Background technique [0002] With the rapid development of defense space technology, the performance requirements of new materials are becoming more and more stringent, and there is an urgent need to develop new materials with high performance. SiC ceramic fibers have excellent properties such as high temperature resistance, low density, high strength, high modulus, wear resistance, and corrosion resistance, making them have broad application prospects as thermal structural materials in many fields. For example, it can be used to manufacture advanced aerospace structural components, high-temperature engines, turbines, atomic reactor walls, catalyst heat exchangers and combustion systems, high-temperature sensors, etc. It also has many uses in metallurgy, we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01F6/58C08G77/60
CPCC08G77/60D01F6/58D01F9/10
Inventor 李凯娜冯春祥马小民田秀梅杜亮
Owner 江苏赛菲新材料有限公司
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