| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
Tin Oxide as a Model System for Sintering without Shrinkage – Monitoring Microstructure Evolution and Elastic Property Changes |
| Author(s) |
Petra Simonova, Willi Pabst, Vojtech Necina |
| On-Site Speaker (Planned) |
Petra Simonova |
| Abstract Scope |
Pure SnO2 ceramics exhibit unusual sintering behavior, because of the prevalence of non-densifying sintering mechanisms (surface diffusion, evaporation-condensation). Therefore, it is an exceptional model system for which property changes occur without changes in porosity. Thus, the influence of other microstructural parameters on the effective properties can be studied. We present experimental findings for pure SnO2 ceramics prepared by uniaxial pressing and sintered to temperatures in the range 500–1400 °C with different dwell times. Using scanning electron microscopy, mercury porosimetry and gas adsorption it is shown that during sintering the geometry and topology of the pore space changes, although the porosity remains constant. Despite the constant porosity, the elastic properties (Young’s modulus measured by temperature-dependent impulse excitation) undergo significant changes, when the original sintering temperature is exceeded. The results from stereology-based image analysis and other methods show that these changes are related primarily to changes in the pore surface curvature. |