Ti(C,N) solid solution-corundum combined refractory material and preparation method thereof

Abstract

The invention particularly relates to a Ti(C,N) solid solution-corundum combined refractory material and a preparation method thereof, belonging to the field of refractory materials. The preparation method is characterized by comprising the following preparation steps: batching, mixing, mechanical pressing and forming, drying, and firing. The raw materials of the refractory material are composed of, by weight, 0-30% of brown fused alumina with a size of 3-5 mm, 30-50% of brown fused alumina with a size of 1-3 mm, 10-30% of brown fused alumina with a size of 0.1-1 mm, 20-50% of brown fused alumina with a size of no more than 200 meshes, 0-10% of metallic aluminum with a size of no more than 200 meshes, and phenolic resin accounting for 2-6% of the total amount of the above raw materials andused as a binding agent. A firing schedule is that drying is performed at 120-600 DEG C for 5-25 hours at first, and then sintering is performed at 1200-1600 DEG C in a nitriding atmosphere for 5-25hours. The Ti(C,N) solid solution-corundum combined refractory material prepared by using the method disclosed by the invention does not need an extra titanium source, and the method has the characteristics of simple process and low production cost. Meanwhile, the produced Ti(C,N) solid solution-corundum combined refractory material has very high normal-temperature and high-temperature strength and superior oxidation resistance, thermal shock resistance and erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. Specifically relates to a Ti(C,N) solid solution bonded corundum refractory material and a preparation method thereof. Background technique [0002] my country has large reserves of high-alumina bauxite with excellent texture, ranking first in the world. The main minerals are diaspore and kaolinite, and the secondary minerals are talc, feldspar, illite, calcite, mica and other minerals. The alumina content is 50 %-85%. Mix the bauxite after preliminary removal of crystal water with low-sulfur anthracite and iron filings in proportion, and heat it at 2000°C for 5-6.5 hours in the smelting furnace to remove Al from the bauxite. 2 o 3 And other oxides other than CaO are reduced to metals and separated to obtain brown corundum (K, Na and Mg are volatilized in gaseous form, and most metals such as Fe, Si and Ti form alloys and sink). The use of high-grade bauxite to produce brown corun...

AI Technical Summary

Problems solved by technology

TiO 2 It is relatively stable, and it is difficult to completely reduce it in the high-temperature carbon reduction process, so there are about 3% TiO in brown corundum products 2 , Al 2 o 3 The content can only reach 95% at most

[0003] Traditional oxide refractories are easily eroded by slag: slag enters the interior of the brick through pores and eroded particle boundaries and reacts further. The reaction process is often accompanied by temperature changes, resulting in structural spalling and corrosion, which seriously affects the service life of refractory materials.

To improve the corrosion resistance of oxide refractory materials, theoretically, the material should be as dense as possible and the porosity should be as small as possible. However, the thermal expansion coefficient of general oxides is high and the thermal conductivity is low, and the densification inevitably leads to the heat resistance of refractory materials. Reduced impact performance