IR-transparent MgO–Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering

• 作者: 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
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Research Article
• 页码范围: 237-246
• 页数: 10页
• 语种: 英文

摘要

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 MPa·m1/2. These characteristics demonstrate that obtained composite MgO–Gd2O3 ceramic is a promising material for protective infra-red (IR) windows.