A screening design approach for the understanding of spark plasma sintering parameters: A case of translucent polycrystalline undoped alumina
Résumé
An experimental screening design was used to evaluate the effects of spark plasma sintering (SPS) parameters such as heating rate, sintering temperature, dwell duration, and green-shaping processing on the relative density, grain size, and the optical properties of polycrystalline alumina (PCA). It is shown that heating rate and sintering temperature are the most critical factors for the densification of PCA during SPS. Green-shaping processing could prevent grain growth at low SPS sintering temperatures. No predominant SPS parameters are observed on the optical properties. Hence, the optical properties of PCA are controlled by microstructural evolution during the SPS process. © 2009 The American Ceramic Society.
Mots clés
- Sintering temperatures
- Critical factors
- Grain size
- Polycrystalline
- Polycrystalline alumina
- Relative density
- Screening design
- Shaping processing
- Electric sparks
- Spark plasma
- SPS sintering
- Optical properties
- Spark plasma sintering
- Sintered alumina
- Heating rate
- Heating
- Grain size and shape
- Grain growth