Method for preparing multi-hollow zirconium oxide fiber by using cotton fiber

Abstract

The invention discloses a method for preparing multiple hollow zirconia fibers from cotton fibers. The method uses natural cotton fiber as a template, and zirconium oxychloride-based zirconium-containing salt solution as an impregnating solution. By controlling the ratio of the additive tin tetrachloride in the salt solution to the active agent polyvinylpyrrolidone, the cotton fiber is soaked The multi-hollow zirconia fiber material maintaining the cotton fiber structure is prepared by immersing in the impregnating solution, drying and sintering at high temperature. The method of the invention is simple and low in cost, and can effectively control the size and shape of the hollow fiber. The prepared zirconia fiber has the fiber morphology of cotton, and most of them are hollow fibers. The prepared hollow zirconia fiber material is beneficial to prevent air Convection prevents the loss of infrared energy of objects and has more excellent heat insulation performance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing zirconia fibers, in particular to a method for preparing multi-hollow zirconia fibers with cotton fibers. Background technique [0002] Zirconium dioxide (ZrO2) has good chemical and thermal stability, excellent high-temperature electrical conductivity, high high-temperature strength and toughness, good corrosion resistance and stability. Among them, fibrous ZrO2 is mainly used in aerospace, national defense, atomic energy and other fields, for ultra-high temperature heat insulation protection materials and ceramic matrix composite reinforcement materials; in ceramic sintering, metal smelting, pyrolysis, semiconductor manufacturing, quartz melting and other fields , used to manufacture ultra-high temperature industrial kilns, ultra-high temperature experimental electric furnaces and other ultra-high temperature heating devices that can withstand ...

AI Technical Summary

Problems solved by technology

Among them, the preparation of zirconia fibers by impregnation method is simple and easy to realize, but its disadvantage is that the zirconium content in the zirconium precursor is too low, while the content of organic components is very high, so it will be in the whole sintering process. The volume shrinkage is large, and the decomposition of organic matter leads to more gaps between the grains of zirconia, so the prepared fiber structure is relatively loose, the strength is also low, and the prepared fiber only has a small number of hollow structures.

The zirconia fiber is prepared by electrospinning, and the fiber length is guaranteed, but due to the different process parameters of the experimental equipment, it is easy to form broken filaments during the production process, and the process of making glue is also cumbersome and complicated, and the hollow structure appears Inconsistent, uneven wall thickness

Sol-gel method, due to the high content of zirconium in the precursor, the defects of fiber performance caused by the decomposition of organic matter will be relatively small, and the strength of zirconia fibers prepared by this method is relatively high, but in this method, The sol system is relatively unstable, and it is easy to spontaneously turn into a gel, which will lose the spinning performance and affect the quality of the obtained fiber. Moreover, no zirconia fiber with a hollow structure has been prepared by the sol-gel method for the time being.

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