CARBORUNDUM BRICK1

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Abstract
A study of carborundum‐clay mixtures with reference to the relation between the proportioning and sizing of the constituents and the properties of the refractory as expressed by the tensile strength, the load test, the slagging and the spalling tests. For good working conditions the amount of clay must suffice to cover the grains of SiC. When subjected to crushing the linear compression varies as the second power of the percentage of carborundum. Oxidizing furnace conditions and the presence of iron oxide, lead oxide and lime reduce the resistance to slag action. The resistance to spalling depends upon the content of SiC, the tensile strength, the coefficient of expansion and the thermal conductivity of the clay. A formula is proposed for the estimation of the life of the carborundum refractories, and a theoretical explanation of their physical properties is offered.

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