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Large-tow continuous silicon carbide fiber preparation device and method

A silicon carbide fiber and preparation device technology, applied in fiber processing, fiber chemical characteristics, melt spinning, etc., can solve problems such as broken filaments and low wool filament efficiency, and achieve fiber wool reduction, low broken filament rate, and device uncomplicated effect

Active Publication Date: 2020-08-25
宁波众兴新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to solve the problems of broken filaments, hairy filaments and low efficiency caused by multi-strand synthesis in the preparation of the above-mentioned large tow silicon carbide fibers

Method used

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  • Large-tow continuous silicon carbide fiber preparation device and method
  • Large-tow continuous silicon carbide fiber preparation device and method
  • Large-tow continuous silicon carbide fiber preparation device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Put 40KG of spinning-grade polycarbosilane with a softening point of 210°C and an oxygen content of 0.4% into a melting kettle, vacuumize and replace nitrogen, and maintain a slight positive pressure of nitrogen; heat up to 400°C, vacuum defoaming; then cool down to a spinning temperature of 300°C ℃. The spinning assembly (the number of spinneret holes is 1000 holes, ring) is installed on the assembly base at the bottom of the spinning box, and the temperature of the spinning box and the spinning assembly is raised to a spinning temperature of 300 °C with heat transfer oil. Observe the temperature difference between the inner and outer rings of the spinneret. When the temperature difference is lower than 4°C, start spinning. During this period, turn on the airflow adjustment switch of the cooler, and automatically (or manually) adjust the airflow to keep the temperature difference between the inner and outer rings of the spinneret below 4°C. The PCS former silk that a...

Embodiment 2

[0070] Put 40KG of spinning-grade polycarbosilane with a softening point of 200°C and an oxygen content of 0.45% into a melting kettle, vacuumize to replace nitrogen, and maintain a slight positive pressure of nitrogen; raise the temperature to 400°C, vacuum defoaming; then cool down to the spinning temperature of 290 ℃. Install the spinning assembly (the number of spinneret holes is 1500, ring-shaped) on the assembly base at the bottom of the spinning box, and heat the spinning box and spinning assembly to a spinning temperature of 290° C. with heat transfer oil. Observe the temperature difference between the inner and outer rings of the spinneret. When the temperature difference is lower than 4°C, start spinning. During this period, turn on the airflow adjustment switch of the cooler, and automatically (or manually) adjust the airflow to keep the temperature difference between the inner and outer rings of the spinneret below 4°C. The PCS precursors prepared by the device o...

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Abstract

The invention discloses a large-tow continuous silicon carbide fiber preparation device which comprises a spinneret plate, a spinning box and a melting kettle. The large-tow continuous silicon carbidefiber preparation device is characterized in that the spinning box comprises a box body, wherein a spinning assembly, a booster pump, a metering pump, a heat conducting oil pipe and a spinneret plateinner ring cooler are arranged in the box body; a cooling air inlet and a cooling air outlet are formed in the box body and communicate with the inner part of the spinning assembly; a temperature measurement thermal resistance and multiple air outlet pipes are arranged in the inner ring cooler; and a cooling air entry is further formed in the inner ring cooler and communicates with the cooling air inlet through a cooler chamber. The invention further discloses a method for producing a large-tow continuous silicon carbide fiber by using the device. The product is finally prepared through preparing before spinning, raising temperature of the melting kettle, raising temperature of the spinning box, spinning and the like. The large-tow continuous silicon carbide fiber prepared through the invention has high strength, less filament break and no bifurcation, and the preparation efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of silicon carbide fiber preparation, in particular to a large tow polycarbosilane melt spinning device and a method for preparing large tow continuous silicon carbide fibers. Background technique [0002] Continuous silicon carbide fiber and its composite materials have excellent properties such as high temperature resistance, low density, high strength, high modulus, wear resistance, corrosion resistance, oxidation resistance, high temperature creep resistance, etc., and are widely used in aviation, aerospace, nuclear energy and other fields Strategic new materials used to manufacture high-tech equipment. [0003] The industrial production of continuous silicon carbide fibers generally adopts the precursor conversion method. Divided into 4 processes: [0004] 1. The PCS precursor is melt-spun to obtain continuous PCS fibers (the "fibers" mentioned below, unless otherwise specified, are continuous fibers)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/08D01D1/10D01D1/09D01D4/02D01D5/088D01D10/02D01F9/10
CPCD01D5/08D01D1/106D01D1/09D01D4/02D01D5/088D01D10/02D01F9/10
Inventor 水洪涛马奕成李鑫马定洲林沛沛
Owner 宁波众兴新材料科技有限公司
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