Aluminium titanate-zircite-zirconium titanate composite material and preparation method thereof

Abstract

The invention relates to a composite material of aluminium titanate, zirconia and zirconium titanate, and a method for preparing the same, which belongs to the field of ceramic materials. The raw materials used by the composite material in weight percentage are: 91 to 94.5 percent of aluminium titanate powder the grain size of which is less than 0.03 millimeter, 4.5 to 8 percent of nano-zirconia powder the grain size of which is less than 100 nanometers, and 1 to 1.5 percent of nanometer titanium dioxide powder the grain size of which is less than 100 nanometers. The method comprises the following steps: after the dry mixing of the raw materials, mixing the mixture with adequate amount of diluent of phenolic resin and ethanol and stirring the mixture for 10 minutes, and removing the ethanol from the slurry after the stirring to obtain a blank for molding, wherein the molding pressure of the blank is between 100 and 150 MPa; drying the blank after molding at a temperature of 110 DEG C for 2 hours; and keeping the temperature of the blank after the drying between 1,500 and 1,550 DEG C for 2 to 3 hours, and sintering the blank to obtain the composite material of the aluminium titanate, the zirconia and the zirconium titanate. The strength of the composite material is far higher than that of the common aluminium titanate material, thus the composite material is a promising updating material in the fields of the metallurgy, glass, automobile, aerospace and the like.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to an aluminum titanate-zirconia-zirconium titanate composite material and a preparation method thereof. Background technique [0002] The invention is to develop an aluminum titanate-zirconia-zirconium titanate composite material that can be used in the fields of metallurgy, automobile, aerospace and the like. The composite material is mainly composed of aluminum titanate, compounded with a small amount of nano-zirconium titanate and nano-titanium oxide. 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 ...

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 aluminum titanate-zirconia-zirconium titanate composite materials at home and abroad have not been reported yet