Methods to Improve the Thermal Shock Resistance of Low Carbon Magnesia Carbon Bricks

The steel industry has always been my country's economic pillar industry. With the rapid development of society, the demand for alloy steel, low carbon steel, and other steel types is increasing, and the requirements for metallurgical refractory materials are also getting higher and higher. Since the 21st century, magnesium carbon materials have been essential alkaline refractory materials in the metallurgical field. It is widely used in converter linings, ladle slag lines, and other parts. Compared with traditional magnesium carbon materials, low carbon magnesium carbon materials (carbon content ≤ 8% (w)) can reduce the amount of carburization of molten steel and relieve the pressure of decarburization of molten steel. At the same time, reducing carbon usage is a kind of protection of non-renewable resources and is in line with the trend of developing green industries. Low-carbon magnesium carbon materials have been well used in smelting special steel.

Rongsheng Low Carbon Magnesia Carbon Bricks

Refractory materials with poor thermal shock resistance will cause cracks and gaps on the surface and inside the material due to temperature changes, and the expansion of cracks will be aggravated after being washed away by molten steel. After repeated erosion, the refractory material is damaged and must be replaced, which affects production. There are two causes of thermal stress in refractory materials. One is that there is a large temperature gradient between the surface and the interior of the refractory material, and the other is that the thermal expansion coefficients of each phase in the refractory material are different. Methods to improve the thermal shock resistance of materials can be to create micro-cracks on the surface and inside the material and use the micro-cracks strengthening properties to neutralize thermal stress. Or introduce a ceramic phase to improve the overall strength of the material and reduce the overall thermal expansion rate. Or introduce a low melting point glass phase, and the melting of the glass phase at high temperatures can disperse thermal stress. However, the introduction of the glass phase will reduce the strength and density of the material, so it is rarely used.

Suggestions for Improving the Thermal Shock Resistance of Low-Carbon Magnesium Carbon Materials

Thermal shock resistance is an important property of low-carbon magnesium carbon materials. However, blindly improving the thermal shock resistance of low-carbon magnesium carbon materials may affect other properties of the materials, such as oxidation resistance and slag erosion resistance. Therefore, when studying the thermal shock resistance of low-carbon magnesium carbon materials, other properties of the materials must also be considered. Rongsheng Refractory Materials Manufacturer, based on many years of production and sales experience, has put forward several suggestions for improving the thermal shock resistance of low-carbon magnesium carbon materials.

(1) In terms of carbon source, many scholars have verified that the introduction of nanocarbon can improve the overall performance of low-carbon magnesium carbon materials. However, nanocarbon has a high cost and low output, while magnesium carbon refractory materials are in high demand. Therefore, nanocarbon has few applications in industry. The in-situ generation of nanocarbon through transition metal catalysis is an efficient method, and this process should be actively developed to achieve industrial production.

(2) In terms of raw materials, the application of other cheap minerals or industrial wastes in low-carbon magnesium-carbon materials should be actively explored. There are many beneficial components (such as SiC, and Al2O3) in industrial waste that can enhance the performance of low-carbon magnesium carbon materials. However, many impurities are often introduced into minerals and waste materials, and the impurity removal process also requires in-depth study. Therefore, issues such as material cost, performance, and environmental protection must be comprehensively considered.

(3) Low-carbon magnesium carbon materials often add a variety of additives to achieve the desired performance. The amount and type of additives can affect the performance of low-carbon magnesium carbon materials. Therefore, developing new composite additive products to improve mixing efficiency and reduce costs is the goal of future development.

Buy high-quality magnesia carbon bricks, and low carbon magnesia carbon bricks for ladle lining materials. Please choose a strong refractory material manufacturer.