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

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 (<1...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 103; no. 4; pp. 2663 - 2673
Main Authors Choi, Boo‐Hyun, Kim, Dae‐Su, Lee, Ku‐Tak, Kim, Bum‐Joo, Kang, Jeong‐Su, Nahm, Sahn
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.04.2020
Subjects
Absorption spectra
Ceramic molds
Ceramics
Densification
fourier transform infrared spectroscopy
Grain growth
hardness
hot pressing
hydrothermal
Knoop hardness
Liquid phases
Low temperature
Sintering
Synthesis
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Summary: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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16969