Corundum refractory is an important category of refractory materials, widely used in metallurgy, ceramics, glass, chemical industry and other industries. Corundum, also known as aluminum oxide, has excellent high temperature resistance and chemical stability, and is an ideal choice for manufacturing refractory materials. This article will discuss in detail the properties, preparation methods, application fields and market prospects of corundum.
Ⅰ. Properties of corundum
The main component of corundum refractory is aluminum oxide, and its chemical formula is Al2O3. The melting point of corundum is as high as 2050 degrees Celsius, and it has excellent refractoriness. It has high compressive strength and flexural strength, and can withstand high temperature and heavy load conditions. Corundum also has good thermal stability and chemical inertness, and can resist the erosion of most acids and alkalis. These excellent physical and chemical properties make corundum refractory materials the preferred material in many high-temperature industrial processes.
Ⅱ. Preparation method of corundum
There are several main methods for preparing corundum refractory materials:
(1) High-temperature sintering method: After mixing raw materials such as bauxite and corundum powder, sinter them at high temperature to form dense corundum refractory materials. This method is suitable for large-scale production and can obtain higher material density and strength.
(2) Melting casting method: Bauxite is melted at high temperature and formed into corundum after cooling. This method can produce high-purity corundum materials suitable for special purposes.
(3) Chemical precipitation method: Nano-scale aluminum oxide is prepared by chemical reaction, and then corundum refractory materials are obtained by heat treatment. This method can control the microstructure of the material and improve its performance.
Ⅲ. Application field of corundum
Corundum refractory materials have been widely used in many industries:
(1) Metallurgical industry: In blast furnaces, converters, furnace linings and other equipment, corundum refractory materials can effectively resist the erosion of high temperature and molten metal, extending the service life of the equipment.
(2) Ceramic industry: As one of the main raw materials for ceramics, corundum can improve the strength and wear resistance of ceramics and is widely used in the production of ceramic tiles, sanitary ware and other products.
(3) Glass industry: Corundum refractory materials play a role in high temperature resistance and chemical stability in glass melting furnaces, which can improve the production efficiency of glass.
(4) Chemical industry: In some chemical reactors, corundum materials provide excellent corrosion resistance and are suitable for high temperature and high pressure chemical reaction environments.
Ⅳ. Corundum market prospects
With the acceleration of the excellent industrialization process, the demand for high-performance refractory materials continues to increase. Due to its excellent performance, the market demand for corundum refractory materials has increased year by year. In particular, in the metallurgical, ceramic, glass and other industries, the application prospects of corundum materials are broad. With the development of emerging technologies, such as energy conservation and environmental protection, intelligent manufacturing, etc., corundum refractory materials are gradually developing towards high performance and functionalization.