Core-shell structured carbon-silicon carbide composite nano-fibers based on coaxial electrostatic spinning process and preparation method thereof

A technology of coaxial electrospinning and composite nanofibers is applied in spinning solution preparation, fiber processing, fiber chemical characteristics, etc. The effect of overcoming inherent defects and reducing production costs

Active Publication Date: 2016-01-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SiC layer deposited by this method is uniform, dense and continuous, but the process method is complex, highly dependent on equipment, and high in cost
[0009] In conclusion, the currently reported methods for preparing C-SiC "core-shell" composite fibers have their own advantages and disadvantages, but there is no method that can simultaneously achieve continuous and uniform preparation, and can adjust the diameter structure of each layer (from micron level to Nanoscale) and the goal of simpler and more convenient process

Method used

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  • Core-shell structured carbon-silicon carbide composite nano-fibers based on coaxial electrostatic spinning process and preparation method thereof
  • Core-shell structured carbon-silicon carbide composite nano-fibers based on coaxial electrostatic spinning process and preparation method thereof
  • Core-shell structured carbon-silicon carbide composite nano-fibers based on coaxial electrostatic spinning process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Weigh 2g of PCS and 1g of polycaprolactone and dissolve them in 10ml of chloroform and magnetically stir for 12h to form a uniform shell precursor spinning solution.

[0046] (2) 1 g of PAN was weighed and dissolved in N,N-dimethylformamide and magnetically stirred in a water bath at 80° C. for 1 h to form a homogeneous core layer precursor spinning solution.

[0047] (3) The solution in step (1) is used as the spinning solution for the shell layer of the outer tube, and the solution in the step (2) is used as the spinning solution for the core layer of the inner tube for coaxial spinning. The advancing speed of the outer tube is 1.35ml / h, the advancing speed of the inner tube is 0.9ml / h, the spinning voltage is 15kV, the distance between the nozzle and the collector is 20mm, the inner diameter of the needle of the shell layer is 1.25mm, and the inner diameter of the needle of the core layer is 0.9mm. The collector type is a vertical flat collector.

[0048] (4) Pu...

Embodiment 2

[0051] (1) Dissolve 2.5g PCS and 1g polystyrene in 10ml tetrahydrofuran and magnetically stir for 12h to form a uniform shell precursor spinning solution.

[0052] (2) 1 g of PAN was weighed and dissolved in N,N-dimethylformamide and magnetically stirred in a water bath at 80° C. for 1 h to form a homogeneous core layer precursor spinning solution.

[0053] (3) The solution in step (1) is used as the spinning solution for the shell layer of the outer tube, and the solution in the step (2) is used as the spinning solution for the core layer of the inner tube for coaxial spinning. The advancing speed of the outer tube is 1.35ml / h, the advancing speed of the inner tube is 0.9ml / h, the spinning voltage is 15kV, the distance between the nozzle and the collector is 20mm, the inner diameter of the needle of the shell layer is 1.25mm, and the inner diameter of the needle of the core layer is 0.9mm. The collector type is a horizontal plate collector.

[0054] (4) Put the precursor com...

Embodiment 3

[0057] (1) Weigh 2g of PCS and 1g of polycaprolactone and dissolve in a mixed solvent composed of 7ml of chloroform and 3ml of N,N-dimethylformamide and magnetically stir for 12h to form a uniform shell precursor spinning solution.

[0058] (2) Dissolve 1.5 g of PAN in N, N-dimethylformamide and magnetically stir in a water bath at 80° C. for 1 h to form a uniform spinning solution of the core layer precursor.

[0059] (3) The solution in step (1) is used as the spinning solution for the shell layer of the outer tube, and the solution in the step (2) is used as the spinning solution for the core layer of the inner tube for coaxial spinning. The advancing speed of the outer tube is 2.7ml / h, the advancing speed of the inner tube is 1.35ml / h, the spinning voltage is 25kV, the distance between the nozzle and the collector is 20mm, the inner diameter of the shell needle is 1.25mm, and the inner diameter of the nuclear needle is 0.9mm. The collector type is a vertical flat collector...

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Abstract

The invention relates to core-shell structured carbon-silicon carbide composite nano-fibers based on a coaxial electrostatic spinning process and a preparation method thereof. The preparation method comprises the following steps: (1) taking a polycarbosilane (PCS) solution and a polyacrylonitrile (PAN) solution as a shell-layer precursor and a core-layer precursor respectively; (2) carrying out electrostatic spinning on the shell/core precursor by using electrostatic spinning equipment with a coaxial needle so as to obtain precursor fibers with a core-shell structure; and (3) carrying out non-smelting treatment and high-temperature pyrolysis treatment on the precursor fibers to finally obtain C-SiC composite fibers with a core-shell structure. The invention provides the novel process method for preparing the core-shell structured composite fibers with carbon fiber cores covering ceramic-phase SiC shells, which have a controllable micro-structure, high efficiency and low cost; and the prepared composite fibers overcome the disadvantage that ceramic fibers are relatively fragile, and functional properties of high intensity and flexibility of the fiber and internal conduction and external insulation are realized.

Description

technical field [0001] The invention relates to a carbon-silicon carbide composite nanofiber with a "core-shell" structure based on a coaxial electrospinning process and a preparation method thereof, including preparation of precursor slurry, coaxial electrospinning and non-melting of the precursor fiber And pyrolysis process, the invention belongs to the field of preparation of new composite fiber materials, in particular to the electrospinning method to prepare C fiber, SiC fiber and the coaxial spinning process of the two. Background technique [0002] C fiber has excellent properties such as high strength, high modulus, no creep, good fatigue resistance, small thermal expansion coefficient, good corrosion resistance, good X-ray permeability, good electrical and thermal conductivity, and good electromagnetic shielding. A new generation of reinforcements. However, C fiber is easily oxidized above 400°C in oxygen-containing environment, which limits its application in high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D01F9/22D01F8/18D01D5/00D01D1/02
Inventor 张亚妮侯翼成来飞伊欣若陈绮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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