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Refractory materials used in steelmaking, nonferrous metallurgy, and high-temperature industrial processes are repeatedly exposed to rapid temperature changes. A refractory lining may be heated to extremely high temperatures during operation and then subjected to cooling, thermal cycling or contact with cooler materials. These temperature changes generate thermal stresses inside the refractory structure. If the stresses exceed the material's ability to accommodate deformation, cracks can form and propagate. Thermal shock resistance is therefore an important factor affecting refractory service life. Natural flake graphite is widely used in carbon-containing refractories because of its excellent thermal and structural characteristics. In particular, graphite can influence the development of thermal stress, heat transfer, and crack propagation within the refractory matrix. This article explains how natural flake graphite contributes to thermal shock resistance and why graphite purity, flake size and particle distribution should be considered when designing refractory formulations.

Learn what grade of natural flake graphite is suitable for MgO C bricks. Compare fixed carbon, flake size, ash content, particle size, and graphite grades for converters, steel ladles, and electric arc furnaces.