Method and equipment of preparing high performance zirconium oxide continuous fiber

Abstract

A preparation method and equipment for high-performance zirconia continuous fibers belong to the field of structural and functional fiber materials. Including using acetylacetone and zirconium oxychloride as the main raw materials to synthesize the precursor zirconium acetylacetonate polymer, dissolving it in methanol to obtain spinning solution, using dry spinning to obtain continuous precursor fiber, heat treatment and sintering to obtain continuous zirconia fiber , a special atmosphere heat treatment process is adopted for the precursor fiber, and the zirconia continuous fiber is blown by air at high temperature to make the fiber stretch and strengthen. The heat treatment is carried out in a multifunctional sintering furnace, which includes an inner tube, an outer tube, and a heating furnace wire wound on the outer tube. When ventilating, the airflow can be blown radially from the inner tube through small slits to the outside of the tube. The process of the invention is simple and easy, and the smooth and uniform zirconia continuous fiber can be prepared with a tensile strength exceeding 2.6 GPa and a continuous length of several kilometers.

Description

(1) Technical field [0001] 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 [0002] 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. [0003] Zirconia continuous fiber is a structural and functional material with great application potential. Compared with other fibers, it has many unique and irreplaceable superior properties. The thermal conductivity of zirconia is the smallest among all metal oxides, which determines that...

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.

Images