Preparation method of continuous SiC fiber having surface carbon-rich structure

A fiber and carbon-rich technology, applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of poor compatibility between two phases, affecting temperature resistance, fiber damage, etc., and achieve stable fiber resistivity, low manufacturing cost, and structural stable effect

Active Publication Date: 2014-09-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Judging from the existing research results and technologies, the method of surface modification of SiC fibers will cause damage to the fibers, and, due to physical adhesion, the coating will peel off under high temperature conditions and the resistivity will change; The conductive phase is introduced into the precursor polycarbosilane through physical blending, and the spinnability of the polymer is often affected due to the poor compatibility of the two phases, making it difficult to obtain fiber products with good mechanical properties; chemical reactions are used to synthesize carbon-rich polycarbosilane , because the carbon-rich structural part is combined with polycarbosilane at the molecular level, SiC fibers with good mechanical properties can be prepared when the amount of introduction is low, and the temperature resistance and oxidation resistance of the fiber can be maintained, but when the amount of introduction increases However, it is still difficult to avoid the impact on spinnability, resulting in a decrease in fiber strength and affecting its temperature resistance

Method used

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  • Preparation method of continuous SiC fiber having surface carbon-rich structure
  • Preparation method of continuous SiC fiber having surface carbon-rich structure
  • Preparation method of continuous SiC fiber having surface carbon-rich structure

Examples

Experimental program
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Embodiment 1

[0045] This embodiment includes the following steps:

[0046] (1) Take 1000g of polydimethylsilane and place it in a reaction kettle, replace the air with high-purity nitrogen, heat to 460°C, and keep warm at this temperature for 4 hours for pyrolysis polymerization; the crude product is dissolved in xylene and filtered , and then heated to 350°C, the filtrate was distilled under reduced pressure at 350°C for 30 minutes, and after cooling, a light yellow resinous polycarbosilane PCS was obtained, with a softening point of 205-228°C; the PCS was placed in a melt spinning device, The continuous PCS fiber is obtained, the number of spinneret holes is 500, and the fiber diameter is 12-14 μm; the continuous PCS fiber is placed in a non-melting device, heated to 220 ° C, and kept for 2 hours to obtain a PCS non-melting fiber;

[0047] (2) The PCS non-melting fiber is continuously stretched at a wire speed of 3m / min (the tension is 80 centinewtons) and fired in a high-temperature tub...

Embodiment 2

[0051] This embodiment includes the following steps:

[0052] (1) The preparation method of the non-melting PCS fiber is the same as that of Example 1;

[0053] Take 1000g of polydimethylsilane and place it in a reaction kettle, replace the air with high-purity nitrogen, heat it to 460°C, and keep it warm at this temperature for 4 hours for pyrolysis polymerization; dissolve the crude product in xylene, filter it, and heat it again to 350°C, the filtrate was distilled under reduced pressure at 350°C for 30 minutes, and after cooling, a light yellow resinous polycarbosilane PCS was obtained, with a softening point of 205-228°C; the PCS was placed in a melt spinning device to obtain a continuous PCS fiber, the spinneret hole number is 500 holes, and the fiber diameter is 12-14 μm; the continuous PCS fiber is placed in a non-melting device, heated to 220 ° C, and kept for 2 hours to obtain a PCS non-melting fiber;

[0054] (2) The PCS non-melting fiber is continuously stretched ...

Embodiment 3

[0058] This embodiment includes the following steps:

[0059] (1) The preparation method of the non-melting PCS fiber is the same as that of Example 1;

[0060] Take 1000g of polydimethylsilane and place it in a reaction kettle, replace the air with high-purity nitrogen, heat it to 460°C, and keep it warm at this temperature for 4 hours for pyrolysis polymerization; dissolve the crude product in xylene, filter it, and heat it again to 350°C, the filtrate was distilled under reduced pressure at 350°C for 30 minutes, and after cooling, a light yellow resinous polycarbosilane PCS was obtained, with a softening point of 205-228°C; the PCS was placed in a melt spinning device to obtain a continuous PCS fiber, the spinneret hole number is 500 holes, and the fiber diameter is 12-14 μm; the continuous PCS fiber is placed in a non-melting device, heated to 220 ° C, and kept for 2 hours to obtain a PCS non-melting fiber;

[0061] (2) The PCS non-melting fiber is continuously stretched ...

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Abstract

The invention relates to a preparation method of a continuous SiC fiber having a surface carbon-rich structure, which comprises the following steps: continuously drawing a polycarbosilane (PCS) unmelted fiber at a traveling speed of 0.5-3 m / min to pass through a high-temperature pipe furnace of 1300-1400 DEG C, and firing, wherein inert atmosphere is used at both ends of the high-temperature pipe furnace to perform gas seal; gas mixture of alkane and the inert atmosphere is introduced into the inner side of the air seal at the inlet end; and the PCS unmelted fiber is converted through pyrolysis, thus preparing the continuous SiC fiber. According to the invention, the process is simple and convenient to operate; the manufacturing cost is low; and the prepared SiC fiber has the advantages of stable surface carbon layer structure, low and adjustable resistivity, high temperature resistance and favorable mechanical property, can suitably serve as a high-performance wave-absorbing structural composite material having integrated functional requirements for wave absorption and load bearing, and is especially applicable to the fields of high-performance weaponry, aviation, aerospace, nuclear industry and the like.

Description

technical field [0001] The invention relates to a method for preparing continuous silicon carbide fibers, in particular to a method for preparing continuous silicon carbide fibers with a carbon-rich surface structure. Background technique [0002] Silicon carbide (SiC) fiber is a high-strength, high-modulus, high-temperature oxidation-resistant ceramic fiber. It is one of the high-performance reinforcing fibers commonly used in advanced lightweight high-temperature resistant structural composite materials; Can be used as radar stealth material. SiC fiber integrates structure-stealth-heat protection and has a wide range of applications in aviation, weapons, ships and some other high-tech fields such as high-temperature structural materials such as engine combustion chambers and nozzles, cruise missile tail radar stealth-structural materials, etc. Application prospect. [0003] The technology of preparing high-performance SiC fibers by organic precursor conversion method was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10
Inventor 简科王军王浩宋永才王应德谢征芳邵长伟
Owner NAT UNIV OF DEFENSE TECH
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