About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
Presentation Title |
The Role of Thermal Expansion Mismatch in the Drying of Refractory Castables Comprising Polymeric Fibers |
Author(s) |
Murilo Henrique Moreira, Sebastião Vicente Canevarolo, Victor Carlos Pandolfelli |
On-Site Speaker (Planned) |
Murilo Henrique Moreira |
Abstract Scope |
The drying stage of hydraulic bonded refractory castables (in which water is the liquid phase added) is the main challenge during their processing, as the vapor pressure and thermomechanical stresses can lead to damage and even explosions. Polymeric fibers are common additives used in the industry to increase permeability, thus promoting safer drying, though the mechanisms that lead to this observed behavior are still unknown. This work uses thermomechanical models and experimental data to investigate how the thermal expansion mismatch between the polymers and the matrix affects the drying rate increase in these compositions. Results pointed out significant tangential stresses around the fibers, but no direct correlation was found between explosion resistance and thermal expansion coefficients alone. Nonetheless, this factor, among others also presented, should be considered when designing and choosing polymer candidates for drying additives. |