MgO-Gd2O3, self-propagating high-temperature synthesis (SHS), spark plasma sintering (SPS), optical properties, infra-red (IR) ceramics
A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-Gd2O3 nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and Gd2O3 phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200 ℃. Near full dense high IR-transparent composite ceramics were fabricated by spark plasma sintering (SPS) at 1140 ℃ and 60 MPa. The in-line transmittance of 1 mm thick MgO-Gd2O3 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-Gd2O3 ceramics is 9.5±0.4 GPa, while the fracture toughness (KIC) amounted to 2.0±0.5 МPa·m1/2. These characteristics demonstrate that obtained composite MgO-Gd2O3 ceramic is a promising material for protective infra-red (IR) windows.
Tsinghua University Press
Dmitry A. PERMIN, Maksim S. BOLDIN, Alexander V. BELYAEV, Stanislav S. BALABANOV, Vitaly A. KOSHKIN, Atrem A. MURASHOV, Igor V. LADENKOV, Evgeny A. LANTSEV, Ksenia E. SMETANINA, Nadia M. KHAMALETDINOVA. IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering. Journal of Advanced Ceramics 2021, 10(2): 237-246.