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IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering
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IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering
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Journal Article
IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering
2021
Overview
A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-Gd
2
O
3
nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and Gd
2
O
3
phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200 °C. Near full dense high IR-transparent composite ceramics were fabricated by spark plasma sintering (SPS) at 1140 °C and 60 MPa. The in-line transmittance of 1 mm thick MgO-Gd
2
O
3
ceramics exceeded 70% in the range of 4–5 mm and reached a maximum of 77% at a wavelength of 5.3 mm. The measured microhardness HV0.5 of the MgO-Gd
2
O
3
ceramics is 9.5±0.4 GPa, while the fracture toughness (
K
IC
) amounted to 2.0±0.5 MPa·m
1/2
. These characteristics demonstrate that obtained composite MgO-Gd
2
O
3
ceramic is a promising material for protective infra-red (IR) windows.
Publisher
Tsinghua University Press,Lobachevsky State University of Nizhny Novgorod,Nizhny Novgorod 603950,Russia%Lobachevsky State University of Nizhny Novgorod,Nizhny Novgorod 603950,Russia%G.G.Devyatykh Institute of Chemistry of High-Purity Substances of the RAS,Nizhny Novgorod 603137,Russia%\"Joint-stock company\"Research and Production Enterprise\"Salut\",Nizhny Novgorod 603950,Russia%G.A.Razuvaev Institute of Organometallic Chemistry of the RAS,Nizhny Novgorod 603137,Russia,G.G.Devyatykh Institute of Chemistry of High-Purity Substances of the RAS,Nizhny Novgorod 603137,Russia
