Sintering furnace for preparing continuous fiber made form zirconia

Abstract

The invention is a method and device of preparing high-performance continuous cobalt oxide fiber, including: using acetylacetone and cobalt oxide as main raw materials to synthesize a precursor cobalt acetyl-acetonate polymer, dissolving the precursor in methanol to obtain spinning solution, using dry-spinning to obtain continuous precursor fiber, making thermal processing of sintering to obtain continuous cobalt oxide fiber, adopting special atmosphere thermal processing process on the precursor fiber, and blowing air flow to the continuous cobalt oxide fiber at high temperature so as to strengthen the fiber extensibility. The thermal processing is made in a functional sintering furnace which contains inner pipe, outer pipe, and heater wire coiled on the outer pipe, and at the time of aerating, the air flow can be radiantly blown out through a fine slit in the inner pipe. The process of the invention is simple and easy to operate, able to prepare smooth and uniform continuous cobalt oxide fiber with tensile strength over 2.6 Gpa and length able to be several kilometers.

Description

[0001] This application is a divisional application of "Preparation Method and Equipment for High-performance Zirconia Continuous Fiber" 03112408.9 (filing date 2003.6.10). (1) Technical field [0002] The invention relates to a method for preparing high-performance high-temperature oxide fibers, in particular to a method for preparing continuous zirconia fibers with high strength, high toughness, high temperature resistance and good heat insulation, belonging to the field of structural and functional fiber materials . (2) Background technology [0003] With the development of economy and science and technology, fiber materials such as quartz fiber, carbon fiber, glass fiber and oxide ceramic fiber are playing an increasingly important role in optical communication, aerospace, military and other high-tech and cutting-edge technology fields. important role. [0004] Zirconia continuous fiber is a structural and functional material with great application potential. Compared w...

AI Technical Summary

Problems solved by technology

Because the melting point of zirconia is too high, its continuous fiber cannot be prepared by melting method, only various precursor methods as mentioned above can be used, and the existing technologies all have their own shortcomings.

From the perspective of the precursor system, the zirconium content in the impregnation method is too low, and it is difficult to prepare high-strength zirconia fibers; from the performance of the spinning solution, the dispersion of zirconium in the mixing method is not uniform enough, the spinning is easy to block and the preparation of nano-sized zirconia The microparticle process is very complicated. The properties of the sol spinning solution in the sol-gel method are not stable, and it is easy to spontaneously turn into a gel, which affects spinning or even cannot be used continuously; in terms of heat treatment, there are also certain deficiencies.

Therefore, the existing technology is difficult to ensure that the prepared zirconia fibers are as continuous as carbon fibers and quartz fibers and can have high strength.

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