Aluminum titanate powder prepared by taking metal aluminum as aluminum source through non-hydrolytic sol-gel process at low temperature and preparation method thereof

Abstract

The invention discloses aluminum titanate powder prepared by taking metal aluminum as an aluminum source through a non-hydrolytic sol-gel process at a low temperature and a preparation method thereof. The metal aluminum and titanium tetrachloride are used as precursor raw materials, anhydrous low-carbon alcohol is used as an oxygen donor, and a proper catalyst is selected to prepare the aluminum titanate powder at the low temperature of 750 DEG C. According to the invention, the metal aluminum is utilized to replace aluminum alkoxide and inorganic aluminum salt as the aluminum source, so the preparation method disclosed by the invention has the outstanding advantages of cheap reaction raw material, simple process, low synthesis temperature and the like, and is suitable for industrial massproduction.

Description

technical field [0001] The invention relates to the technical field of ceramic powder preparation, in particular to an aluminum titanate powder prepared at low temperature by a non-hydrolytic sol-gel process using aluminum as an aluminum source and a preparation method thereof. Background technique [0002] Aluminum titanate combines low expansion and high temperature resistance, and also has high melting point, low thermal conductivity, small expansion coefficient, good thermal shock resistance, strong corrosion resistance and non-wetting of various metals and glass melts. And other characteristics, it has broad application prospects in the fields of steel, non-ferrous metals, glass, chemical industry, automobile, military industry and so on. Aluminum titanate powder is an important raw material for preparing aluminum titanate ceramic materials. The key to the industrialization and wide application of aluminum titanate ceramic materials is to select cheap reaction raw mate...

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Problems solved by technology

The solid-phase method directly uses solid alumina and titanium oxide as raw materials. After mechanical mixing, it generally needs to be calcined at 1400-1500°C to synthesize aluminum titanate powder; the combustion method needs to add a large amount of fuel to provide the energy required for the synthesis of aluminum titanate, and The synthesis temperature is above 1300°C; the co-precipitation method needs to adjust the pH value to make the aluminum and titanium ions precipitate evenly, the control process is more complicated, and the synthesis temperature is generally around 1300°C (see Y.X.Huang, Materials Research Bulletin, 2002, Vol.37, P99~111); The sol-gel method has the advantages of small particles, uniform dispersion, and easy control of stoichiometry, but most of the precursor raw materials used are expensive metal alkoxides. For this reason, this research group disclosed in ZL200610005317.X A method of synthesizing aluminum titanate by using the inorganic salt aluminum nitrate as the aluminum source and applying the hydrolytic sol-gel process is proposed. Compared with using aluminum alkoxide as the aluminum source, the raw material cost is significantly lower, but the synthesis temperature is as high as 1350 °C; The research group disclosed in ZL200610005316.5 a non-hydrolytic sol-gel method using inorganic salts aluminum chloride and titanium tetrachloride as precursor raw materials, which reduces the synthesis temperature of aluminum titanate to 750 ° C, but must use Anhydrous aluminum chloride is used as aluminum source, and anhydrous aluminum chloride itself is easy to absorb water, it is neither easy to store nor easy to weigh

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