| Resistive Heating Assisted Microwave Sintering of Y2O3
/
Dy2O3
Nanocomposite Ceramics: Tailoring Optical
Transmittance and Microhardness Properties for Infrared
Transparency Applications |
Steffy Maria Jose,a, b Rini Varghese,a, c Lakshmi Jayachandran Santhakumari,a, d Jijimon
Kumpukattu Thomasa, *
Pages : 161-175
DOI: 10.1080/0371750X.2025.2515378 |
| Abstract |
| The fabrication of an infrared-transparent yttria/dysprosia (Y2O3
/Dy2O3
) nanocomposite
ceramics using an innovative resistive heating assisted microwave (RHAM) sintering
technique is reported. X-ray diffraction of the auto-combustion synthesized
nanocomposite powder revealed a body-centered cubic structure with Y2O3
as the
primary phase and Dy2O3
as the secondary phase. Fourier transform infrared
spectroscopy confirmed chemical bonding. The compacted nanocomposite,
consisting of 80% Y2O3
and 20% Dy2O3
(YD82), achieved 99.2% of its theoretical density
after RHAM sintering at 1410o±10oC for 30 min with a heating rate of 40oC/min and the
field emission scanning electron microscopy showed a mean grain size of 0.15 m.
Vicker’s microhardness tests indicated load-dependent behaviour, with the modified
proportional specimen resistance model yielding a load-independent microhardness
of 9.29 GPa. The RHAM-sintered sample demonstrated 81.5% transmittance in the
infrared (IR) spectrum and 80.5% in the UV-visible spectrum. A comparative study
showed RHAM-sintered samples outperformed those sintered with silicon carbide
susceptor-assisted microwave sintering. These results highlight the potential of Y2O3
/
Dy2O3
nanocomposite for high-quality IR-transparent applications, such as IR windows,
domes, and transparent armors.
[Keywords: Infrared transparent ceramics, Y2O3
/Dy2O3
, Nanocomposite, Resistive
heating assisted microwave sintering, Microhardness] |
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