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Preparation method of carbonized silicon (SiC) sub-micron fibers

A technology of micron fiber and silicon carbide sub-technology, which is applied in the field of silicon carbide fiber preparation, can solve the problems of low fiber yield and uneven fiber diameter, etc., and achieve the effect of fine fiber diameter, good crystal form and short production cycle

Inactive Publication Date: 2013-02-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanofibers with smaller diameters can be obtained by electrospinning technology, the current method has disadvantages such as low fiber yield and uneven fiber diameter.

Method used

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  • Preparation method of carbonized silicon (SiC) sub-micron fibers
  • Preparation method of carbonized silicon (SiC) sub-micron fibers
  • Preparation method of carbonized silicon (SiC) sub-micron fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of spinning solution: mix polyurea silane and polymethyl methacrylate at a mass ratio of 10:5, dissolve it in tetrahydrofuran to make polyurea silane / polymethyl methacrylate spinning solution ; The concentration of the polyurea silane in the total solution is 10%;

[0024] (2) Preparation of precursor fibers by solution jet spinning: the spinning solution is supplied to the spinneret die at a rate of 15mL / h / spinning hole, so that the spinning solution is extruded from the spinning hole to form a thin stream of solution ; Then utilize a high-speed jet stream (pressure is 0.50MPa, temperature is 25 ℃) to draw and thin the described fine flow of spinning solution, and make it enter the drying chamber; Under the action of the chamber, the precursor fibers are gradually formed; finally, the precursor fibers are collected on the mesh curtain by the suction airflow generated by the fan. The distance from the spinneret die to the screen curtain, that is, the re...

Embodiment 2

[0030] (1) Preparation of spinning solution: mix polycarbomethylsilane and polylactic acid / polystyrene (mass ratio 1:1) at a mass ratio of 10:10, dissolve it in a mixed solvent of toluene and tetrahydrofuran, and the solvent volume The ratio is 1: 1 to make spinning solution; the concentration of polycarbomethylsilane in the total solution is 20%;

[0031] (2) Precursor fibers are prepared by solution jet spinning: the spinning solution is supplied to the spinneret at a rate of 20mL / h / spinning hole, so that the spinning solution is extruded from the spinneret to form a thin stream of solution; Then utilize a high-speed jet stream (pressure is 1.0MPa, temperature is 45 ℃) to draw and thin the described fine stream of spinning solution, and make it enter drying chamber; Under the action of the box, the nascent fibers are gradually formed; finally, the nascent fibers are collected on the mesh curtain by the suction airflow generated by the fan. The distance from the spinneret to...

Embodiment 3

[0035] (1) Preparation of spinning solution: mix polycarbomethylsilane / polyurea silane (mass ratio 1:1) and polystyrene in a mass ratio of 10:10, dissolve it in a mixed solvent of toluene and tetrahydrofuran, The volume ratio of the solvent is 3:1 to make a spinning solution; the concentration of the polycarbomethylsilane / polyureasilane in the total solution is 30%;

[0036] (2) Preparation of precursor fibers by solution jet spinning: the spinning solution is supplied to the spinneret die at a rate of 5 mL / h / spinning hole, the air jet pressure is 0.60 MPa, the jet air temperature is 60 °C, and the mesh curtain The receiving distance is 200cm.

[0037] (3) Non-melting treatment: the above-mentioned as-spun fibers were heated in an air atmosphere at a rate of 3°C / min, kept at 200°C for 1 hour, and cooled to room temperature to obtain non-melting fibers.

[0038] (4) High-temperature calcination treatment: Under the protection of inert gas, the above-mentioned non-melting fiber...

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Abstract

The invention relates to a preparation method of SiC sub-micron fibers. The method includes the steps that a precursor polymer is mixed with a fiber-forming polymer according to a mass ratio of (5:20)-(20:5) and dissolved in a solvent to produce an even and stable spinning solution; the spinning solution is supplied to a spinneret at a rate of 5-30mL / h for each spinneret orifice and extruded through the spinneret orifice to form solution trickles, and simultaneously, the spinning solution trickles are drafted and refined by high-speed injection airflow with an injection pressure of 0.1-1.5MPa to form precursor fibers with diameters of 50nm-10mum; the precursor fibers are subjected to oxidation treatment under an atmospheric condition of 160-250DEG C to obtain infusible fibers; and the infusible fibers are subjected to high-temperature calcinations under an inert gas atmosphere of 1000-1600DEG C to obtain the SiC sub-micron fibers with diameters of 10nm-5mum. The preparation method has the advantages of being high in production efficiency, simple in process, even in fiber diameter distribution, suitable for scale production and the like.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide fibers, in particular to a method for preparing silicon carbide submicron fibers. Background technique [0002] Silicon carbide (SiC) has the advantages of high hardness, excellent oxidation resistance, corrosion resistance, mechanical properties, thermal conductivity, high wear resistance, low thermal expansion coefficient, and low friction coefficient. In addition, silicon carbide is also a wide bandgap semiconductor material, which has the characteristics of wide band gap, high critical breakdown voltage, high thermal conductivity, and high carrier mobility. Devices, ultraviolet detectors and short-wave light-emitting diodes have broad application prospects. As a new type of ceramic fiber, silicon carbide fiber exhibits a series of excellent properties in terms of tensile strength, creep resistance, high temperature resistance, oxidation resistance and good compatibility with ceramic m...

Claims

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Application Information

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IPC IPC(8): D01F9/10D01D5/04
Inventor 庄旭品程博闻颜贵龙陶潇枭康卫民
Owner TIANJIN POLYTECHNIC UNIV
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