Highly IR transparent ZnS ceramics sintered by vacuum hot press using hydrothermally produced ZnS nanopowders

Boo Hyun Choi, Dae Su Kim, Ku Tak Lee, Bum Joo Kim, Jeong Su Kang, Sahn Nahm

Research output: Contribution to journalArticle

Abstract

Hydrothermally synthesized ZnS nanopowders comprising small and large particles were used to synthesize ZnS ceramics. Small particles (200 nm) existed in the gaps between the large particles (0.7 μm) and assisted the densification of the ZnS ceramics. ZnS ceramics sintered at low temperatures (<1000°C) exhibited small grains with large grain-boundary areas that provided diffusion paths for carbon ions from the graphite mold, resulting in carbonate absorption bands. ZnS ceramics sintered at high temperatures (≥1000°C) for a long time (≥2.0 hours) exhibited a dense microstructure with very large grains (>500 μm). The ZnS liquid phase, which was formed at approximately 980°C, assisted the densification and grain growth of the ZnS ceramics. A 3.0-mm-thick ZnS ceramic sintered at 1000°C for 16 hours showed a high Knoop hardness (321 kgf/mm2) and a high transmittance of 71% in the wavelength range 6.0-12 μm without carbonate absorption bands.

Original languageEnglish
Pages (from-to)2663-2673
Number of pages11
JournalJournal of the American Ceramic Society
Volume103
Issue number4
DOIs
Publication statusPublished - 2020 Apr 1

Keywords

  • fourier transform infrared spectroscopy
  • hardness
  • hot pressing
  • hydrothermal

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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