Optical and mechanical properties of transparent alumina fabricated by high-pressure spark plasma sintering |
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Authors: | Barak Ratzker Avital Wagner Maxim Sokol Sergey Kalabukhov Moshe P Dariel Nachum Frage |
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Affiliation: | Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel |
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Abstract: | Transparent alumina was fabricated from untreated commercial powder by high-pressure spark plasma sintering (HPSPS) at temperatures of 1000, 1050 and 1100 °C under pressures of 250-800 MPa. It was established that transparency strongly depends on the HPSPS parameters. At all temperatures, there was a certain point when increasing the pressure led to decreasing transparency. At 1100 °C, relatively high pressure led to excessive grain growth, as well as the formation of creep-induced porosity at the center of the samples. Hardness values decreased with pressure due to grain growth, correlated with the Hall-Petch relationship. The optimal combination of optical and mechanical properties (68% in-line transmittance at a wavelength of 640 nm and a hardness value of about 2300 HV2) was achieved after sintering at 1050 °C under 600 MPa. |
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Keywords: | Corresponding author Alumina High-pressure spark plasma sintering Transparent Hardness |
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