A large tow continuous silicon carbide fiber preparation device and method

A technology of silicon carbide fiber and preparation device, which is applied in fiber processing, fiber chemical characteristics, melt spinning and other directions, can solve the problems of low yarn efficiency, broken yarn, etc., and achieves low yarn breaking rate, reduced fiber yarn, convenient effect of operation

Active Publication Date: 2022-01-11
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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  • A large tow continuous silicon carbide fiber preparation device and method
  • A large tow continuous silicon carbide fiber preparation device and method
  • A 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 ℃. The spinning assembly (the number of spinneret holes is 1500 holes, ring) is installed on the assembly base at the bottom of the spinning box, and the spinning box and the spinning assembly are heated 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 b...

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Abstract

The invention discloses a large tow continuous silicon carbide fiber preparation device, which includes a spinneret, a spinning box and a melting kettle, and is characterized in that the spinning box includes a box, and a spinning Components, booster pumps, metering pumps, heat transfer oil pipes, and spinneret inner ring coolers; the box is provided with cooling air inlets and cooling air outlets, and the cooling air inlets and cooling air outlets are connected to the inside of the spinning assembly Phase conduction; the inner ring cooler is provided with a temperature measuring thermal resistor and a plurality of outlet pipes, and the inner ring cooler is also provided with a cooling air inlet, and the cooling air inlet and the cooling air inlet are cooled The cavity of the device is connected; the invention also discloses a method for producing large tow continuous silicon carbide fibers by the device, and the product is finally obtained through steps such as preparation before spinning, heating of the melting kettle, heating of the spinning box, and spinning. The large tow continuous silicon carbide prepared by the invention has high strength, less broken wires, no bifurcation, and high production efficiency.

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 Patents(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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