Transparent polycrystalline alumina obtained by SPS: Single and double doping effect

Burcu Apak*, Halide Esra Kanbur, Esra Ozkan Zayim, Gultekin Goller, Onuralp Yucel, Filiz Cinar Sahin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Commercial nanocrystalline alpha alumina powders were used for fabrication of dense and transparent alumina by spark plasma sintering (SPS). High purity dopants such as MgO, Y2O3, TiO2 and CaO with 150 ppm amount were added to alumina and powder mixtures were densified by SPS between 1175 and 1300°C using 80 MPa pressure for 5 to 20 min durations. The influences of MgO, Y2O3, TiO2 and CaO single and double doping on density, hardness, fracture toughness and microstructures of alumina samples are investigated. The highest hardness value was measured as 24.2 GPa in the sample doped with 150 ppm MgO and 150 ppm CaO sintered at 1175°C under 80 MPa pressure for 20 min. The fracture toughness values were ranged between 3.3 and 4.9 MPa.m1/2. Alumina ceramic with 150 ppm MgO which was spark plasma sintered at 1175 °C for 20 min showed the highest Real Inline Transmittance (RIT) value as 55.5%.

Original languageEnglish
Title of host publicationMaterials Processing and Interfaces
PublisherMinerals, Metals and Materials Society
Number of pages7
ISBN (Print)9781118296073
Publication statusPublished - 2012
Event141st Annual Meeting and Exhibition, TMS 2012 - Orlando, FL, United States
Duration: 11 Mar 201215 Mar 2012

Publication series

NameTMS Annual Meeting


Conference141st Annual Meeting and Exhibition, TMS 2012
Country/TerritoryUnited States
CityOrlando, FL


  • Alumina
  • Doping
  • Spark plasma sintering


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