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Advantages of silicon carbide bricks
High melting point and excellent refractoriness
One of the outstanding advantages of silicon carbide bricks is its high melting point. The melting point of silicon carbide is as high as about 2700℃. The refractoriness of silicon carbide bricks made based on this can reach about 1790℃. In high-temperature industrial scenarios such as steel and non-ferrous metal smelting, it can maintain structural stability at extremely high temperatures, without softening or melting, laying a solid foundation for the safe operation of equipment such as furnaces. For example, in the process of blast furnace ironmaking, the temperature in the furnace is often as high as 1500℃ or more. Silicon carbide bricks, as furnace lining materials, can withstand such high temperatures, effectively extend the service life of the furnace, and reduce the cost and time loss caused by frequent maintenance.
Good chemical stability
Silicon carbide bricks show strong resistance to chemical corrosion such as acid, alkali and salt solutions. In chemical production, many reactions are carried out in corrosive chemical environments. Reactor linings, pipelines and other components made of silicon carbide bricks can exist stably and do not react chemically with these chemicals, ensuring the continuity and safety of the production process. For example, in some factories that produce strong acids such as sulfuric acid and hydrochloric acid, silicon carbide bricks are used to construct the lining of related equipment, effectively resisting the corrosion of strong acids, greatly extending the service life of equipment, and reducing the cost of equipment replacement.
High thermal conductivity and improved thermal efficiency
The thermal conductivity of silicon carbide bricks is between 80-200W/(m・K), which enables it to quickly transfer heat in high temperature environments. In equipment such as ceramic kilns and glass melting furnaces, the good thermal conductivity of silicon carbide bricks can be used to distribute heat more evenly and quickly to the entire furnace space, thereby improving the thermal efficiency of the furnace. On the one hand, it can make the processed ceramics, glass and other products more evenly heated and improve product quality; on the other hand, it reduces heating time and energy consumption, achieves energy conservation and emission reduction, and is in line with the current concept of green development.
High hardness and excellent wear resistance
Silicon carbide bricks have a high hardness, with a Mohs hardness of 9, second only to diamond and boron nitride. In the wear-resistant pipes, impellers, pump chambers, cyclones and hopper linings of metallurgical ore dressing, as well as parts that are subjected to material scouring in the building materials and ceramics industry, silicon carbide bricks can effectively resist the scouring and wear of materials with their high hardness and excellent wear resistance, greatly extending the service life of the equipment. In the ore conveying pipelines of the ore dressing plant, the use of silicon carbide bricks as linings can greatly reduce pipeline wear and reduce the number of shutdowns and repairs caused by pipeline damage, thereby improving production efficiency.
Low expansion coefficient and dimensional stability
Silicon carbide bricks have a small thermal expansion coefficient and can maintain good dimensional stability at high temperatures. They are not easily deformed or cracked due to temperature changes. In blast furnaces, hot blast furnaces and other equipment in the steel industry, the temperature in the furnace changes frequently. Silicon carbide bricks, as masonry materials for key parts, can adapt to such temperature fluctuations, always maintain the original shape and size, maintain the integrity and sealing of the furnace structure, and ensure the stable operation of the furnace.
Excellent thermal shock resistance
It can withstand rapid changes in temperature without cracking or breaking. In some industrial furnaces that need frequent heating and cooling, such as forging heating furnaces, the temperature in the furnace changes dramatically during heating and cooling. The thermal shock resistance of silicon carbide bricks enables them to withstand such temperature shocks, ensure the reliability of the furnace lining, avoid material damage caused by temperature changes, and thus reduce maintenance costs and improve production efficiency.
High temperature strength advantage
In high temperature environments, silicon carbide bricks can still maintain high compressive and flexural strengths and will not deform or break easily. In application scenarios such as electric furnace linings and crucibles, silicon carbide bricks can withstand pressure and bending at high temperatures, provide a stable support structure for processes such as high-temperature smelting, and ensure the smooth progress of the production process. In non-ferrous metal smelting, crucibles used to hold high-temperature metal solutions are made of silicon carbide bricks, which can withstand the weight and high temperature of the metal solution, ensuring safe and efficient smelting operations.
Silicon carbide bricks, with their many significant advantages, play an irreplaceable role in many high-temperature industrial fields such as steel, non-ferrous metal smelting, chemicals, building materials, and glass. With the continuous development and innovation of materials science and technology, the performance of silicon carbide bricks will continue to be optimized and improved, and their application areas will be further expanded, continuously contributing to the high-quality development of modern industry.
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