Method for preparing micron-order alumina fiber

Abstract

The invention discloses a method for preparing a micron-order alumina fiber. The method comprises the following steps: adding deionized water into diethylenetriamine pentaacetic acid, heating in a water bath at 80 DEG C to completely dissolve the diethylenetriamine pentaacetic acid; adding aluminum nitrate, continuously stirring for 2-6 hours after precipitated is generated; aging for 4 hours, decompressing and filtering the precipitate, drying for 6 hours at a constant temperature of 80 DEG C to obtain an alumina fiber precursor; putting the alumina fiber precursor into a quartz crucible; heating in an air atmosphere at a temperature of 600-1,200 DEG C, and maintaining for 2 hours to obtain the micron-order alumina fiber. The method is simple, low in reaction temperature, short in time, low in price of equipment; the prepared material is large in draw ratio and excellent in thermal stability, and has excellent commercial application prospect.

Description

technical field [0001] The invention relates to the technical field of synthesis of alumina fiber materials, in particular to a method for preparing micron-sized alumina fibers by means of an aqueous solution homogeneous precipitation method. Background technique [0002] Fibrous materials of metal oxides have attracted great interest due to their high thermal stability, greater anisotropy, and good flexibility compared to bulk materials. As a material closely related to people's lives, metal oxide fibers are bound to greatly promote social development. At present, alumina fiber is the most widely studied and applied. Alumina fiber has many excellent properties, such as high strength, high temperature resistance, high melting point, etc., and also has strong corrosion resistance, good thermal shock resistance, good heat insulation performance, light weight, and small volume. The fields of high-temperature furnaces, aerospace, environmental protection and recycling, and rei...

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Problems solved by technology

The slurry produced by the slurry method contains a lot of water and volatile matter, and it must be dried before sintering, and an appropriate heating rate must be selected to prevent the fiber from breaking due to rapid volume shrinkage when the gas volatilizes, and the prepared fiber diameter is relatively small. Large, poor weaving, limited application; the aluminum source used in the pre-polymerization method is an organic aluminum source, which is expensive and the production cost is high; the product of the sol-gel method has high purity and good uniformity, and the obtained fiber has good tensile properties. Strong designability and various products, but this method has many influencing factors, long production cycle, and poor repeatability; the basic fiber impregnation solution method uses inorganic aluminum salt as the impregnation solution, and viscose fiber with good hydrophilicity as the impregnated basic fiber. Inorganic aluminum salts are dispersed in the matrix fiber in a molecular state, and alumina fibers with complex shapes can be obtained through steps such as impregnation, drying, sintering, and weaving. This method has high production costs, complicated processes, and difficult control of product performance. poor quality

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