Optical and mechanical properties of transparent alumina fabricated by high-pressure spark plasma sintering

Barak Ratzker, Avital Wagner, Maxim Sokol, Sergey Kalabukhov, Moshe P. Dariel, Nachum Frage*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)2712-2719
Number of pages8
JournalJournal of the European Ceramic Society
Volume39
Issue number8
DOIs
StatePublished - Jul 2019
Externally publishedYes

Keywords

  • Alumina
  • Hardness
  • High-pressure spark plasma sintering
  • Transparent

Fingerprint

Dive into the research topics of 'Optical and mechanical properties of transparent alumina fabricated by high-pressure spark plasma sintering'. Together they form a unique fingerprint.

Cite this