Polycrystalline transparent magnesium aluminate spinel processed by a combination of spark plasma sintering (SPS) and hot isostatic pressing (HIP)

Shahar Cohen, Barak Ratzker, Maxim Sokol, Sergey Kalabukhov, Nachum Frage

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A two-stage processing approach combining spark plasma sintering (SPS) and hot isostatic pressing (HIP) was employed for the fabrication of relatively large (30 mm diameter) and thick (up to 8 mm) samples of transparent polycrystalline magnesium aluminate. The effects of sample thickness, heating rate during SPS, and the temperature and duration of HIP treatments were investigated. It was established that the heating rate during SPS had a major influence on discoloration due to carbon contamination, which increased with sample thickness. HIP treatment allowed for the elimination of cloudiness due to samples porosity, although carbon contamination present after the SPS step could not be reduced by HIP treatment, regardless of the temperature and duration applied. Highly transparent specimens with thicknesses of 4 and 8 mm exhibiting an in-line transmittance of 85.2 and 83.2% at 600 nm, respectively, were fabricated.

Original languageEnglish
Pages (from-to)5153-5159
Number of pages7
JournalJournal of the European Ceramic Society
Volume38
Issue number15
DOIs
StatePublished - 1 Dec 2018

Keywords

  • Hot isostatic pressing
  • Magnesium aluminate spinel (MgAlO)
  • Spark plasma sintering
  • Transparent ceramic

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Polycrystalline transparent magnesium aluminate spinel processed by a combination of spark plasma sintering (SPS) and hot isostatic pressing (HIP)'. Together they form a unique fingerprint.

Cite this