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"Ladenkov, Igor V."
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IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering
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.
Journal Article
IR-transparent MgO-Gd.sub.2O.sub.3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering
A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-[Gd.sub.2][O.sub.3] nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and [Gd.sub.2][O.sub.3] phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200 [degrees]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.sub.2][O.sub.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.sub.2][O.sub.3] ceramics is 9.5 [+ or -] 0.4 GPa, while the fracture toughness ([K.sub.IC]) amounted to 2.0 [+ or -] 0.5 MPa*[m.sup.1/2]. These characteristics demonstrate that obtained composite MgO-[Gd.sub.2][O.sub.3] ceramic is a promising material for protective infra-red (IR) windows. Keywords: MgO-[Gd.sub.2][O.sub.3]; self-propagating high-temperature synthesis (SHS); spark plasma sintering (SPS); optical properties; infra-red (IR) ceramics
Journal Article