Improved Thermal Stress Resistance Parameters Considering Temperature Gradients for Bricks in Refractory Linings

Abstract

The thermal stress resistance (TSR) parameters available in the literature are basically “figures of merit” that should help for the selection of materials for engineering design involving thermal stress fracture. However, they are based on very simplified models. For instance, they neglect or simplify the thermal gradient or rather the stress field that actually exist in practice. The state of stress was analytically calculated and the results implemented in the established thermal stress fracture parameters (R, R″) and damage parameter (R″″). For each of them, an analytical solution and an approximation were derived. The reviewed TSR parameters allow a clearly improved prediction of the resistance to thermal shock for bricks in refractory linings and facilitate the classification of industrial refractories.

Thermo-mechanical response FEM simulation of ceramic refractories undergoing severe temperature variations

“…The development of stresses inside brittle solids undergoing rapid and severe temperature variations has been a subject of both theoretical and applied studies for more than fifty years [1][2][3][4][5][6][7][8][9]. The practical significance of understanding and quantifying the phenomenon stems from the numerous applications that involve structural components operating in environments featuring intensely varying temperature distributions.…”

Characterization of Sintered Niobium–Alumina Refractory Composite Granules Synthesized by Castable Technology

“…Besides corrosion, they need to withstand thermal stress and thermal shock, which can be evaluated using several thermal resistance parameters. [1,2] Refractories are typically based on mixtures of fine powders and coarse aggregates with particles sizes up to a few millimeters. For such materials, nonlinear effects must be considered on investigating crack initiation and crack propagation.…”

“…[5] Thermal shock resistance of refractories can be improved by lowering Young's modulus and increasing thermal conductivity of the material. [1,2] This can be achieved using refractory composites that are based on refractory ceramics and refractory metals such as tantalum-alumina or niobium-alumina, [6] which showed promising high-temperature mechanical properties. [7,8] The design of refractory castables is a challenge as there is no overall best material, only for certain applications.…”