Comprehensive Creep and Thermophysical Performance of Refractory Materials

Energy Efficiency Challenges Addressed Through the use of Advanced Refractory Ceramic Materials

“…Compressive Creep Performance and High Temperature Dimensional Stability of Conventional Silica Refractories 1 This first project was funded in 1996 ($150K over 2 years) under the DOE AIM Program to investigate the long term mechanical performance and corrosion resistance of commercially available conventional silica refractories like those found in traditional float glass furnace superstructures. Work was performed at ORNL and MS&T to examine compressive creep Additional aspects of the tested refractories such as dimensional stability, phase content, microstructure and composition as a function of temperature were also studied.…”

“…Compressive Creep and Thermophysical Performance of Mullite Refractories 1 Following the study of conventional silica refractories, work was funded in 1998 at ORNL and MS&T ($200K over 2 years) by the DOE IMF Program to examine the compressive creep and corrosion behavior of commercially available mullite refractories for use in borosilicate glass furnace crowns, superstructures, and sidewall applications at temperatures ranging from 1300-1450 o C and stresses between 0.2-0.6 MPa. Additionally, such refractories were being considered as replacements for traditional silica refractories in oxy-fuel furnace environments which offered higher operating temperatures and throughputs with increased corrosion potential.…”

“…Compressive Creep and Thermophysical Performance of Fusion-Cast Alumina and Spinel Refractories 1 Further work was funded at ORNL and MS&T in 1999 ($500K over 5 years) by the DOE IMF and ITP Programs to examine the compressive creep and corrosion behavior of commercially available fusion-cast alumina and spinel refractories for use in oxy-fuel fired furnace crowns, superstructures, and sidewall applications at temperatures ranging from 1450-1650 o C and stresses between 0.6-1.0 MPa. Additional aspects of the tested refractories such as dimensional stability, phase content, microstructure and composition as a function of temperature were also studied.…”

Multi-level modeling of viscoelastic microcracked masonry

“…Generally, viscous behaviour of vitreous materials in gaz turbine engines has been modeled by temperature independently rheological models like Maxwell and the generalized Maxwell models [24]. Models with a temperature parameter have also been defined since the steady-state creep deformation of ceramics under sustained loading conditions normally exhibits a power-law stress-dependent behaviour [26,2,25,30]. Traditionally, both tensile and compressive creep in ceramic materials have been characterized by an empirical creep equation that takes on the form of the Norton-Bailey-Arrhenius equation.…”

Contribution to the understanding of the high temperature behavior and of the compressive creep behavior of silica refractory materials

“…[3][4][5][6][7][8][9][10][11][12][13][14] At temperature higher than 1500 • C (as usually observed inside the roof in most of glass furnaces), silica exhibits a non-conventional creep behavior. 15,16 The creep curves does not present any deformation or exhibit an expansion. Weresczak et al 15,16 propose that the expansion may be explained by the tridymite to cristobalite transformation, the enlargement of pores and growth of the initial critobalite part of the material.…”