Fabrication of infrared-transparent Y2O3–MgO composites using nanopowders synthesized via thermal decomposition

Preparation and study of the mechanical and optical properties of infrared transparent Y2O3–MgO composite ceramics

“…14,15 The resulting composites showed improved mechanical performance and were proposed could meet the future requirements of next-generation IR transparent windows and domes. Harris et al 16 A number of synthetic methods, such as thermal decomposition, 19 flame spray pyrolysis, 20 and the sol-gel method, 21,22 can be applied to produce composite nanopowders. Generally speaking, the sol-gel method is better than other techniques because of its homogeneous phase distribution and precise composition control.…”

“…The details of the molar ratio are similar to the previous study, 35,36 we investigated the influence of synthesis conditions of the sol-gel method on the properties of A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

“…Some attenuation could be clearly observed in the midinfrared ranges (3-5 µm), and deviations become more A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Synthesis of MgO Coating Gd2O3 Nanopowders for Consolidating Gd2O3-MgO Nanocomposite with Homogenous Phase Domain Distribution and High Mid-Infrared Transparency

“…Moreover, the two specimens have several absorption peaks at approximately 7 µm due to the asymmetrical and symmetrical stretching vibrations of the carboxylate groups, forming in the starting powders or subsequent sintering process because of the remaining carbon-containing groups. This is detrimental to the optical performance of a nanocomposite in the infrared wavelength range [38]. Therefore, the production of carbonfree nanocomposite powders with good dispersion and a uniform phase domain is key to further improving the infrared transmittance performance of nanocomposites.…”

Control of the nanostructure of MgO–Y2O3 composite ceramics using two-step sintering for high temperature mid infrared window applications

“…Several authors have developed dense MgO-Y2O3 nanocomposite ceramics with a homogeneous microstructure. Many powder synthesis routes have been reported: the mains are flame spray pyrolysis [10], colloidal dispersion of commercial powders [17], thermal decomposition [18] and sol-gel method [19]. For sintering, natural sintering [8], hot pressing [12], [20] or Spark Plasma Sintering (SPS) [21], [22] have been considered before an air annealing and/or a Hot Isostatic Pressing (HIP) post treatments.…”