Method for preparing micron-order alumina fiber

Abstract

The invention discloses a preparation method of micron-scale alumina fiber. The method is as follows: take diethylenetriaminepentaacetic acid, add deionized water, heat in a water bath at 80°C to completely dissolve the diethylenetriaminepentaacetic acid, and then add nitric acid Aluminum, continue to stir for 2-6 hours after precipitation occurs, age for 4 hours, filter the precipitate under reduced pressure, and dry at a constant temperature of 80°C for 6 hours to obtain the alumina fiber precursor; put the obtained alumina fiber precursor in a quartz crucible, °C in the air atmosphere and kept for 2 hours to obtain the micron-sized alumina fibers. The invention is simple, the reaction temperature is lower, the time is shorter, and the equipment used is cheap; the obtained material has a large length-to-diameter ratio, good thermal stability, and good commercial application prospects.

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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