Thermal Diffusivity Behavior of a Refractory Castable Matrix

摘要

The most distinctive aspect of castable refractories is their dynamic microstructure behavior upon first heating under service conditions. Because of their attractive cost/benefit ratio, low- and ultralow-cement refractory castables are widely used as linings of furnaces and refining vessels in metallurgical, cement and petrochemical industries. From a broad perspective, wherever fired refractory brick (mainly of the high-Al_2O_3 class) are used, they can be advantageously replaced by low- and ultralow-cement castables, provided that an appropriate tailoring of the properties is made, vis a vis, to the service conditions. Compared to fired brick, the most distinctive aspect of castable refractories is their dynamic microstructure behavior upon first heating under service conditions, which eventually evolves into a stable state as a result of final phase assembly, developed after many hours under service at high temperatures ( > 1200℃).