Thermal and optical properties of transparent magnesium oxide ceramics fabricated by post hot-isostatic pressing

Kiyoshi Itatani, Takuma Tsujimoto, Akira Kishimoto

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The transparent magnesium-oxide (MgO) ceramic could be fabricated by a hot-isostatic press (HIP) technique of pressureless-sintered MgO compact, using non-agglomerated MgO powder with the average primary particle size of 57 nm. The relative density and average grain size of MgO compact pressureless-sintered at 1600 °C for 5 h were 96.7% and 10.7 μm, respectively. Owing to the HIPing operation (0.5 h) of pressureless-sintered compact at a temperature between 1500 and 1600 °C, relative densities of the MgO ceramics attained 99.9% or more with light transmission. The average grain size increased from 132 to 199 μm with HIPing temperature from 1500 to 1600 °C. The in-line transmission of the MgO specimen HIPed at 1600 °C for 0.5 h increased from 52 to 55% with increasing wavelength from 500 to 900 nm and corresponded to approximately 65%, compared to that of the MgO single crystal. The thermal conductivity of this MgO specimen attained 53.5 W m-1 K-1, whereas the thermal diffusivity decreased gradually to reach 0.0416 cm2 s-1 with increasing test temperature up to 873 K.

Original languageEnglish
Pages (from-to)639-645
Number of pages7
JournalJournal of the European Ceramic Society
Volume26
Issue number4-5
DOIs
Publication statusPublished - Jan 11 2006

Keywords

  • Grain size
  • Hot-isostatic pressing
  • MgO
  • Optical properties
  • Thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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