Improvement of translucency in Al2O3 ceramics by two-step sintering technique

Dong Suk Kim, Jong Heun Lee, Rak Joo Sung, Sang Woo Kim, Hyung Soo Kim, Jeong Shik Park

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Pure, 140, 500, and 2500 ppm MgO-doped Al2O3 specimens were sintered at 1700 °C in a vacuum with and without pre-sintering heat treatment (HT) at 800 °C for 50 h in air. Pre-sintering HT improved the transmittance in the visible (400-700 nm) range significantly. This enhanced transmittance was explained in terms of the removal of residual pores and the homogenization of the microstructure due to the lowering of the boundary mobility as a result of the MgO addition and the suppression of local densification through a pre-coarsening step.

Original languageEnglish
Pages (from-to)3629-3632
Number of pages4
JournalJournal of the European Ceramic Society
Issue number13-15
Publication statusPublished - 2007

Bibliographical note

Funding Information:
This work was supported and funded by Korea Energy Management Corporation and partly by the KOSEF-JSPS Core University Program Japan and Korea.


  • AlO
  • Lamp envelopes
  • Optical properties
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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