Method for preparing nano zircite combining aluminium titanate composite material

Abstract

The invention relates to a method for preparing a composite material of the combination of nano-zirconia and aluminium titanate, which belongs to the field of ceramic materials. The method comprises the following steps: dispersing aluminium titanate powder the grain size of which is less than 0.01 millimeter into a zirconium oxychloride aqueous solution the concentration of which is between 0.02 and 0.06 mol per liter; dripping ammonia into the mixture while stirring until the pH value is between 8.7 and 9.5 to obtain a soliquid deposition; calcining the soliquid deposition at a temperature of more than 600 DEG C for 2 hours after dehydration and drying to obtain composite material powder of the combination of the nano-zirconia and the aluminium titanate, wherein the diameter of the powder is less than 100 nanometers, and the components of the powder in weight percentage are: 2 to 10 percent of zirconia and 90 to 98 percent of the aluminium titanate; performing pressure molding on the powder to form a blank with the pressure of more than or equal to 100 MPa; and keeping the temperature of the blank at 1,500 DEG C for 2 hours and sintering the blank to obtain the composite material of the combination of the nano-zirconia and the aluminium titanate. The strength of the material is higher than that of the common aluminium titanate material, thus the composite material is a promising updating material for a continuous casting water gap for metallurgy of iron and steel or a nonferrous metallurgy liquid-raising tube.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a preparation method of nano-zirconia combined with aluminum titanate composite material. Background technique [0002] The invention is to develop a composite material of nano zirconia combined with aluminum titanate which can be used in metallurgy, automobile, aerospace and other fields. The composite material is composed of aluminum titanate as the main component and a small amount of nano zirconium titanate. The composite material has good high temperature performance, strength and thermal shock resistance. [0003] At present, the molten steel tundish zirconia (ZrO) in the steel metallurgical billet continuous casting system 2 ) The material of the sizing nozzle is prone to thermal shock cracking and peeling due to instantaneous thermal shock, and the expansion of the aperture of the nozzle will cause the interruption of the pouring operation and even cause the ...

AI Technical Summary

Problems solved by technology

However, the aluminum titanate ceramic material has two disadvantages: one is that the thermal expansion of each crystal axis of the aluminum titanate crystal has a large difference, resulting in micro-cracks of the aluminum titanate during cooling, so the mechanical strength of the aluminum titanate material is low, and the room temperature resistance is relatively low. The flexural strength is lower than 20MPa; the second is that the high-temperature synthesized aluminum titanate is unstable when cooled to 900°C-1300°C, and decomposes into rutile (TiO 2 ) and corundum (α-Al 2 o 3 ), while losing the low expansion properties

The research and application of nano zirconia combined with aluminum titanate composite materials have not been reported at home and abroad.