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 °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-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 MPa·m1/2. These characteristics demonstrate that obtained composite MgO-Gd2O3 ceramic is a promising material for protective infra-red (IR) windows.
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The study was funded by the Russian Science Foundation (Research Project No. 19-73-10127). The IR spectral studies were performed on the equipment of the Analytical Centre of the G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences.
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Permin, D.A., Boldin, M.S., Belyaev, A.V. et al. IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering. J Adv Ceram (2021). https://doi.org/10.1007/s40145-020-0434-1
- self-propagating high-temperature synthesis (SHS)
- spark plasma sintering (SPS)
- optical properties
- infra-red (IR) ceramics