High temperature mechanical testing of cordierite porous ceramics

SANDOVAL M. L.; TALOU, M. H.; TOMBA, A. G.; CAMERUCCI, M. A.

Conferencia; 11th International Conference on Advanced Materials; 2009

Mechanical behavior of porous ceramic prepared by starch thermogelling (potato and cassava) was evaluated.Green disks were formed by thermogelling of suspensions of talc, kaolin and alumina with addition of starch as consolidator/binder andpore forming agent. Porous cordierite materials were obtained by calcination and reaction-sintering (1330°C, 4h). Mechanical behaviorwas evaluated in diametral compression at RT, 800, 1000 and 1100ºC. From load-displacement curve (Fig. 2), apparent stress (σ)-strain (ε) relationship was obtained by calculus and mechanical parameters (fracture strength, apparent Young modulus and elasticlimit) were determined. The obtained results were analyzed in function of developed microstructures (Fig. 1) and testing temperatures.