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Procesxs for producing continuous silicon carbide fibre by skin and core double-composition fibre method

A bi-component fiber and continuous silicon carbide technology, applied in fiber chemical characteristics, fiber treatment, textiles and papermaking, etc., can solve problems such as excessive fiber diameter, broken filaments, poor weaving performance, etc., and achieve excellent tensile properties , the effect of reducing the diameter

Inactive Publication Date: 2006-02-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is a region of low strength, filament breakage occurs during winding and continuous fiber cannot be produced
In addition, the fiber diameter is too large, and the weaving performance is very poor, which greatly limits its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Mix 100g PAN (average molecular weight M w =42000) was completely dissolved in 400 g of analytically pure DMF to make a 20% solution as skin fluid. The skin fluid was kept at 80°C with external heating.

[0032] 2. Dissolve 2g of dispersant NP-10 in 180g of DMF, then add 200g of β-SiC powder (average particle size 0.1μm, maximum particle size 0.25μm) and 0.6g amorphous boron powder (average particle size 0.6μm, maximum particle size 1.0 μm). The resulting mixture was ball milled for 1 h, and then 120 g of 20% PAN in DMF (M of PAN w =20000), continue ball milling for 3h (ball milling temperature 100°C) to obtain a uniform core liquid. The core fluid was kept at 80°C by means of external heating.

[0033] 3. The skin liquid and core liquid respectively pass through an independent spinning metering pump and a candle-shaped filter, and then enter the skin-core composite spinneret assembly. The filtration accuracy of the skin liquid filter is 2 μm, the filtration acc...

Embodiment 2

[0041] Same as Example 1, the difference is that the fibrils are prepared by dry spinning, that is, the difference is in Steps 4 and 5 of Example 1. The fibers coming out of the composite spinning assembly enter the heating chamber to volatilize the solvent to form fibers, and the heating temperature is 165°C. Simultaneous stretching during the heating process, the stretching ratio is 1000%, and the stretched fiber is wound to obtain a fibril.

[0042] Continuous SiC fibers were obtained after sintering with an average diameter of 29 μm and a relative density of 95.8%. The average grain size is 0.12μm, and there is no abnormal grain growth. XRD analysis shows that the fiber is single-phase SiC, and the content of α-SiC is greater than 90%. Chemical elemental analysis indicated that the fibers were essentially stoichiometric SiC.

Embodiment 3

[0044] Same as Example 1, the difference is that the skin liquid polymer is viscose, the falling ball viscosity of the viscose is 120s, the NaOH content is 5.5%, and the maturity is 7ml 10%NH 4 Cl, the temperature of the skin liquid during spinning is 30°C.

[0045] Same as Example 1, the difference is that in item 2 of Example 1, 2g of dispersant JA-281 is dissolved in 180g of distilled water, and then 200g of β-SiC powder (average particle size 0.1 μm, maximum particle size 0.25 μm) is added ) and 0.6 g of amorphous boron powder (average particle size 0.6 μm, maximum particle size 1.0 μm). The obtained mixed fluid was ball-milled for 1 hour, then 120 g of the same viscose solution as the skin solution was added, and the ball-milling was continued for 3 hours (ball-milling temperature 80° C.) to obtain a uniform core solution.

[0046] With embodiment 1, difference is that in the 4th item of embodiment 1, the composition of coagulation liquid is 220g / L Na 2 SO 4 , 13g / LZnS...

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PUM

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Abstract

The production process of continuously preparing SiC fibre includes the following steps: dissolving high-molecular polymer in solvent to prepare skin solution, dissolving or dispersing the dispersing agent, high-molecular polymer, SiC powder and sintering adjuvant into solvent to prepare core solution, extruding skin solution and core solution from microhole of skin-core composite spinning component under the pressure to make skin solution cover exterior of the core solution, using wet process or dry process to solidifying fluid-flow wire, drawing, drying and winding so as to obtain raw fibre, its core portion is ceramic powder adhered by polymer and its skin portion is made of pure high-molecular material.

Description

(1) Technical field [0001] The invention relates to a production process of continuous silicon carbide (SiC) fibers. (2) Background technology [0002] SiC fiber has the advantages of high strength, excellent heat resistance, oxidation resistance and high temperature creep resistance. Continuous SiC fibers are mainly used as reinforcements of metal or ceramic matrix composites (CMC), especially CMC reinforcements, to improve their strength and toughness. Due to its outstanding high temperature resistance, SiC fiber reinforced CMC has become a key material for aerospace, defense weaponry, nuclear radiation resistant components and ceramic engines. The performance of composite materials depends largely on the properties of fibers, so high-performance SiC fibers are the key to the development of this type of composite materials. As a CMC reinforcement, SiC fibers are generally required to be continuous and weavable. [0003] The most mature technology for preparing SiC fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10C04B35/565C04B35/622D01F9/08D01D5/34
Inventor 陈立富罗学涛张立同
Owner XIAMEN UNIV
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