Method for preparing aluminum oxide whiskers

A technology of alumina whiskers and carbon dioxide, applied in the direction of alumina/aluminum hydroxide, to achieve the effect of simplifying industry, simple equipment, and easy industrial production

Inactive Publication Date: 2014-07-02
LUOYANG WIDSOM LIFE MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the defects existing in the existing alumina whisker preparation method, and provide a new preparation method of alumina whisker, the technical problem to be solved is to solve the chemical energy by efficiently utilizing the chemical reaction Nano oxides such as alumina whiskers, low cost, unfilterable solution, simple process

Method used

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  • Method for preparing aluminum oxide whiskers

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Experimental program
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Effect test

Embodiment 1

[0023] Configure aluminum sulfate solution 0.4mol / L, adjust the pH value to 6.5 with ammonia water, put calcium carbonate into the reaction kettle, and quickly pour hydrochloric acid. Close the reaction kettle, stir until the reaction is complete, and pass carbon dioxide into the above-mentioned aluminum sulfate solution. Stir at 300 rpm for 20 hours until the reaction is complete. 0.6 MPa of carbon dioxide is introduced into the airtight container for pressure filtration. Dry at 100°C and calcined at 1200°C for 1 hour to obtain alumina whiskers.

[0024] The SEM scanning picture of the final aluminum oxide whisker product is as follows figure 1 shown. The average diameter of the alumina whiskers is 50-100 nm, and the average length of the alumina whiskers is 1-5 μm.

Embodiment 2

[0026] Configure aluminum sulfate solution 0.45mol / L, adjust the pH value to 6.5 with ammonia water, put calcium carbonate into the reaction kettle, and quickly pour hydrochloric acid. Close the reaction kettle, stir until the reaction is complete, and pass carbon dioxide into the above-mentioned aluminum sulfate solution. Stir at 400 rpm for 20 hours until the reaction is complete. 0.5 MPa of carbon dioxide is introduced into the airtight container for pressure filtration. Dry at 100 degrees and calcined at 1150 degrees for 1 hour. Alumina whiskers are obtained.

Embodiment 3

[0028] Configure aluminum sulfate solution 0.5mol / L, adjust the pH value to 6.5 with ammonia water, put calcium carbonate into the reaction kettle, and quickly pour hydrochloric acid. Close the reaction kettle, stir until the reaction is complete, and pass carbon dioxide into the above-mentioned aluminum sulfate solution. Stir at 300 rpm for 20 hours until the reaction is complete. 0.4MPa carbon dioxide is passed through the airtight container for pressure filtration. Dry at 100 degrees and calcined at 1200 degrees for 1 hour. Alumina whiskers are obtained.

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Abstract

The invention relates to a method for preparing aluminum oxide whiskers. The method comprises the steps of preparing a 0.4-0.5mol/L aluminum sulfate solution, and adding ammonia water to adjust the pH value of the solution to be 6.5; pouring hydrochloric acid into a reaction kettle accommodating calcium carbonate, quickly closing the reaction kettle, and stirring till the reaction in the reaction kettle is complete and a pressure is formed; slowly introducing the obtained carbon dioxide into the prepared aluminum sulfate solution, and stirring for 20-24 hours till the reaction is complete; putting the slurry after reacting into a closed container, introducing carbon dioxide of which the pressure is 0.1-0.6MPa, and performing filter pressing; then drying at 100 DEG C, and calcining at 1000-1200 DEG C to obtain nano aluminum oxide whiskers; finally, drying the calcium chloride solution obtained by the reaction to obtain a calcium chloride drying agent. The technical scheme provided by the invention has the advantages that the morphology of the aluminum oxide whiskers can be controlled, the cost is low, the pollution is avoided, the industry is simplified, the application is wide, the calcium chloride drying agent serving as a byproduct can be obtained, and the like.

Description

technical field [0001] The invention relates to a preparation process in the field of chemical industry, in particular to a preparation method of alumina whiskers. Background technique [0002] Alumina is an important structural ceramic material, which has a wide range of applications in dielectric, high wear-resistant and high-strength applications. Nanoceramics have attracted widespread attention due to their excellent mechanical properties. Nanowhiskers have higher mechanical properties due to higher interfacial energy than fibers. Widely used in the reinforcement of tire rubber, paint, plastic and other industries. Alumina whiskers have not only high strength but also high temperature properties. The traditional preparation of nano-alumina whiskers is mostly prepared by using alkaline solution, urea, etc. as a precipitating agent or by high-temperature smelting. The cost in the process is high, the process conditions are difficult to control, and it is not easy to fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 于显著李锋坤
Owner LUOYANG WIDSOM LIFE MATERIAL SCI & TECH
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