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Engineering Conferences International
Alumina; High-pressure spark plasma sintering; Microstructure; Transparent ceramics.
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Full-Text Articles in Engineering
Microstructure Evolution During High-Pressure Spark Plasma Sintering (Hpsps) Of Transparent Alumina, Barak Ratzker, Sergey Kalabukhov, Nachum Frage, Avital Wagner
Microstructure Evolution During High-Pressure Spark Plasma Sintering (Hpsps) Of Transparent Alumina, Barak Ratzker, Sergey Kalabukhov, Nachum Frage, Avital Wagner
Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities
Applying high-pressure during spark plasma sintering (so-called HPSPS) enables rapid densification of a ceramic powder at relatively lower temperatures, limiting grain growth and allowing fabrication of fine-grained highly transparent ceramics. The present work focuses on the fabrication of fine submicron transparent alumina from untreated commercial powder by HPSPS and the microstructure evolution during consolidation under high applied pressure. The sintering was conducted at relatively low temperatures (1000-1100°C) under high pressure varied from 250 to 800 MPa. We review unique sintering phenomena such as stress-enhanced grain growth and de-sintering, which are related to creep taking place during the final stage of …