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
Critical factors
Grain size
Polycrystalline
Polycrystalline alumina
Relative density
Screening design
Shaping processing
Sintering temperatures
Spark plasma
SPS sintering
Electric sparks
Grain growth
Grain size and shape
Heating
Heating rate
Sintered alumina
Spark plasma sintering
Optical properties