Method for preparing silicon carbide and precursor composite fibers

A composite fiber, precursor technology, applied in the direction of fiber chemical characteristics, dry spinning, conjugated synthetic polymer rayon, etc., can solve the problem of low fiber yield, achieve high yield, short production cycle, heat Excellent stability

Inactive Publication Date: 2013-02-27
TIANJIN POLYTECHNIC UNIV
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  • Method for preparing silicon carbide and precursor composite fibers
  • Method for preparing silicon carbide and precursor composite fibers
  • Method for preparing silicon carbide and precursor composite fibers

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[0024] For the preparation device used in all embodiments of the present invention see figure 1 : the spinneret hole 21 and the spinneret air gap 22 are located on the spinneret die head 2, and are connected to the spinning liquid storage tank 1 through the infusion tube; the vacuum chamber 6 is connected to the exhaust fan 7, and the fibers in the drying chamber 3 are sucked in the collection Net curtain 4 on.

[0025] Embodiment 1.

[0026] (1) Preparation of oil-in-water (O / W) spinning emulsion: 12g polycarbosilane was dissolved in 10mL toluene to make a homogeneous oil phase solution with a mass fraction of 60%; 1.5g polyethylene oxide was dissolved in Add 0.07g sodium lauryl sulfate to 10mL of distilled water to form a homogeneous water phase solution with a mass fraction of 13%; then add the water phase solution dropwise to the oil phase solution, stir and mix to obtain a stable and uniform Oil-in-water (O / W) spinning emulsion;

[0027] (2) Precursor fibers prepared b...

Embodiment 5

[0048] (1) Preparation of oil-in-water (O / W) spinning emulsion: 10g of polycarbosilane and 5g of polyureasilane were dissolved in 10mL of toluene and carbon tetrachloride mixed solution (volume ratio of toluene and carbon tetrachloride 1: 1) to make a homogeneous oil phase solution with a mass fraction of 55%; 4g polyvinylpyrrolidone and 2g polyvinyl alcohol were dissolved in 10mL distilled water, and 0.02g alkyl betaine was added to form a mass fraction of 37.5%. A homogeneous water phase solution; then adding the water phase solution dropwise into the oil phase solution, stirring and mixing to obtain a stable and uniform oil-in-water (O / W) spinning emulsion;

[0049] (2) Precursor fibers prepared by solution jet spinning: the spinning emulsion is supplied to the spinneret die at a rate of 12mL / h / spinning hole, the jet air flow rate is 20000 times that of the spinning emulsion fine flow, and the jet air flow temperature The temperature is 100°C, the spray angle is 20°, and th...

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Abstract

The invention relates to a method for preparing silicon carbide and precursor composite fibers. A silicon carbide precursor polymer is dissolved in at least one organic solvent to form uniform oil phase solution with the mass fraction of 10-70%; a water-soluble fiber-forming polymer is dissolved in water, surfactants are added, uniform water phase solution with the mass fraction of 1-50% is formed, and the quantity of the surfactants is 0.1-10% of the mass of the solution; the precursor solution and the water-soluble polymer solution are mixed according to the volume ratio of 1:10-1:1 to obtain stable oil-in-water (O/W) spinning solution; spinning precursor fibers with the spinning solution by a solution jet spinning method to obtain a precursor composite fiber with the diameter ranging from 50 nanometers to 50 micrometers; and the precursor fibers are not melted and calcined at high temperature to obtain silicon carbide fibers. The method has the advantages of high production efficiency, simple process, uniformity of fiber diameter distribution and the like, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a silicon carbide precursor composite fiber. Background technique [0002] Silicon carbide is a third-generation semiconductor material and is considered to be an excellent material for a new generation of microelectronic devices and integrated circuits. It has the characteristics of large band gap, high working temperature, high thermal conductivity, high electron saturation drift velocity, high breakdown field strength, low intrinsic carrier concentration, strong radiation resistance, and good chemical stability. It is an ideal material for high temperature, high frequency, high voltage resistance, radiation resistance and high power electronic devices. Silicon carbide fiber is a high-performance ceramic fiber that has attracted the attention of the material industry in recent years. It not only has low density, high specific strength, high specific modulus, small linear expansion coefficient, and hig...

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Application Information

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IPC IPC(8): D01F8/16D01F1/10D01D1/09D01D5/04D01F9/10C04B35/565
Inventor 程博闻颜贵龙庄旭品陶潇枭康卫民
Owner TIANJIN POLYTECHNIC UNIV
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