Boron nitride reinforced iron runner material

Abstract

The invention discloses a boron nitride reinforced iron runner material. The iron runner material with good properties is prepared from raw materials such as brown alumina, silicon carbide, silica micropowder, hexagonal boron nitride, Si micropowder and graphite. According to the iron runner material, after boron nitride is added, under high-temperature circumstances, boron nitride has a graphitoid layered structure, and layers are bonded by relatively weak molecular bonds, so that the interface bonding of boron nitride and SiC is relatively weak, the thermal expansion coefficient of the material is relatively small, the deformation of the material under high-temperature conditions is lowered, and the thermal shock resistance of the material is improved; and on the other hand, hexagonal boron nitride has non-wetting property to slag melt and is oxidated at the temperature of 900 DEG C so as to produce boron oxide, boron oxide reacts with alumina in the material so as to produce aluminum borate, aluminum borate is subjected to volume expansion and forms a dense layer, protective oxidation occurs, and the slag erosion resistance of the material is enhanced. According to the boron nitride reinforced iron runner material, the slag erosion resistance and thermal shock resistance of the iron runner material can be remarkably improved, the chemical erosion resistance is high, the thermal shock stability is good, and the service life is long.

Description

【Technical field】 [0001] The invention relates to the technical field of metal smelting, in particular to the technical field of a boron nitride-enhanced iron trench material. 【Background technique】 [0002] The blast furnace tapping chute is a channel for guiding high-temperature molten iron slag. The lining of the blast furnace tapping chute is directly subjected to high-temperature erosion of molten iron and slag, mechanical wear, chemical erosion, and frequent alternation of rapid cooling and rapid heating during use. Therefore, refractory materials for blast furnace tapping trough should have good high temperature mechanical strength, chemical corrosion resistance and thermal shock stability. At present, Al2O3-SiC-C castables are generally used as refractory materials for blast furnace tapping channels. The quality of Al2O3-SiC-C castables is mainly reflected in their service life. With the continuous development of blast furnace smelting technology, blast furnaces are...

AI Technical Summary

Problems solved by technology

With the strengthening of smelting, the demand for increasing the output of molten iron is becoming increasingly prominent, and the demand for a large amount of iron passing through the main iron channel at one time is also becoming more and more urgent. However, due to the poor thermal shock resistance of the main iron channel, thermal spalling and structural spalling occur, resulting Not anti-corrosion is an important reason for the short life of the main iron channel

"An Al2O3-SiC-C iron channel castable and its preparation method" discloses a preparation method of a catalyst-added iron channel castable, which uses the action of the catalyst at high temperature to generate carbon whiskers in situ to improve the iron channel The high-temperature service performance of the castable material, carbon whiskers have the advantages of high strength and elastic modulus, high temperature resistance, corrosion resistance, etc., which can improve the service performance and prolong the service life of the iron trench castable, but its main defect is the generation of carbon whiskers Limited, the price of the catalyst is expensive, which is not conducive to the realization of industrial production

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