Viscosity homogenizing/bubble removing integrated device and method for preceramic polymer spinning melt

Abstract

The invention relates to a viscosity homogenizing / bubble removing integrated device and method for a preceramic polymer spinning melt. The device comprises a bubble removing kettle and is characterized in that the upper portion of the bubble removing kettle or a kettle upper cover is provided with a feeding metering pump, the bottom of the bubble removing kettle is provided with a spinning metering pump, a first umbrella-shaped guide face, a second umbrella-shaped guide face, a third umbrella-shaped guide face and a fourth guide and temperature homogenizing arc face are sequentially arranged in the inner cavity of the bubble removing kettle from top to bottom, the joint of the first umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a first overflow seam, and the joint of the second umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a second overflow seam. The method uses the viscosity homogenizing / bubble removing integrated device to perform viscosity homogenizing and bubble removing. The viscosity homogenizing / bubble removing integrated device and method has the advantages that bubbles in the spinning melt can be completely removed while melt temperature and viscosity homogenizing can be achieved, bubble removing efficiency and melt viscosity uniformity are increased, the breaking and deformation of thin spinning flow and fiber breakage during spinning can be avoided, original fiber defects can be reduced, and the performance of the finished-product ceramic fibers can be increased.

Description

technical field [0001] The invention belongs to the field of fiber preparation, and in particular relates to a device and method for homogenizing / defoaming integrated ceramic precursor polymer spinning melt. Background technique [0002] Continuous SiC fiber, Si 3 N 4 Fiber, SiBN(C) fiber and other high-performance continuous ceramic fibers are key raw materials for aerospace and military applications due to their high temperature resistance, high strength, high modulus and special electromagnetic properties. The precursor conversion method is a common method for preparing high-performance continuous ceramic fibers. The steps are to first synthesize ceramic precursor polymers such as polycarbosilane, polycarbosilane and polysilazane, and then melt spinning, non-melting and high-temperature heating Solution, the continuous ceramic fiber can be prepared. [0003] The melt spinning of ceramic precursor polymer is a key step in the preparation of continuous ceramic fibers, be...

AI Technical Summary

Problems solved by technology

Obviously, this method has low degassing efficiency, low production capacity, and cannot achieve uniform and thorough degassing of the melt.

On the other hand, due to the large volume of the melting kettle, the heating is generally completed by the heat medium or the electric heating body outside the kettle wall, and the heat transfer is transmitted from the kettle wall to the center of the kettle body, which will inevitably cause the temperature difference between the inside and outside, and the temperature of the melt will increase. The temperature uniformity is poor, which leads to insufficient viscosity uniformity of the melt, which has an adverse effect on fiber spinning and reduces the quality of the raw silk

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