What are high-alumina bricks used for
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Time：
2024-02-17
High-alumina brick is a kind of mid-grade refractory brick in refractory stereotyped products, which belongs to neutral refractory materials and is used in the lining of industrial kilns.
The quality of high-alumina bricks is divided into different aluminum content and body density, and the refractory degree of high-alumina bricks reaches 1790 °C. It is also possible to add raw materials of different compositions to produce different materials and composite refractory bricks. Add a certain proportion of phosphoric acid, after low temperature sintering, can be produced into phosphate bricks, add a certain proportion of silicon carbide, high temperature sintering can be produced into silicon Mo bricks or silicon carbide bricks. Adding different proportions of andalusite and sillimanite can be produced into low-creep high-alumina bricks, and these three kinds of refractory bricks are also distinguished by different grades and qualities of refractory bricks according to different content and bulk density.
From the perspective of high-alumina bricks alone, the aluminum content of more than 48% can be called high-alumina bricks, and there are high-alumina bricks with different aluminum content of 55%, 65%, 75%, 80% and 85%, which can be used in the furnace lining at different temperatures. However, high-alumina bricks are not suitable for use in acidic or alkaline furnace linings, the composition of high-alumina bricks is aluminum, and the production technology is made by adding high-alumina powder to high-alumina particles in different proportions, and sintering at high pressure and high temperature. High strength and good thermal shock stability.
Especially after adding composite materials of different materials, it is more widely used, and after adding corundum, silicon carbide, silicon nitride, andalusite, kyanite, sillimanite, magnesium powder and other materials, it can be used in special furnace linings in different fields. It further broadens the scope of use of high-alumina bricks.
High-alumina brick is the most widely used and largest amount of refractory refractory products, widely used, can be used in metallurgy, building materials, environmental protection, electric power, glass and other industries of different furnace linings, the most suitable for use at 1250-1500 °C high temperature.
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