Synthesis of Y 2 O 3 -MgO nanopowder and infrared transmission of the sintered nanocomposite

Abstract

A sol-gel method was successfully used to synthesize Y 2 O 3 -MgO composite powder with a grain size below 30nm. Results from X-ray diffraction revealed how the microstructure evolved with increasing heat treating temperature. Taking advantage of high heating rate, spark plasma sintering (SPS) technique was used to sinter the nanopowder, resulting in a fully dense nanocomposite with grain size below 100nm. The transmittance can be enhanced by optimizing sintering parameters as well as appropriate post-sinter annealing. The fully consolidated nanocomposite exhibits an optical transmittance between 75% and 84% over infrared wavelength range between 3µm and 6µm. This kind of nanocomposite has a great potential to be used as infrared transparent material.

A Foaming Esterification Sol–Gel Route for the Synthesis of Magnesia–Yttria Nanocomposites

“…A less costly derivative of the sol–gel technique is esterification sol–gel (ESG) processing, which utilizes esterification of less expensive precursors to create a similar sol–gel environment under a wider range of synthesis conditions 18,19 . This ESG approach has been used recently for the synthesis of catalytic nanoparticles and metal oxide/polymer nanocomposites, but to our knowledge the only previous report on synthesis of oxide/oxide composites via this route is by Jiang and Mukherjee 20 . In their study chloride precursors were used to produce magnesia–yttria (MgO–Y 2 O 3 ) nanocomposites via an ESG process, but no microstructural details were reported.…”

“…18,19 This ESG approach has been used recently for the synthesis of catalytic nanoparticles and metal oxide/polymer nanocomposites, but to our knowledge the only previous report on synthesis of oxide/oxide composites via this route is by Jiang and Mukherjee. 20 In their study chloride precursors were used to produce magnesia-yttria (MgO-Y 2 O 3 ) nanocomposites via an ESG process, but no microstructural details were reported.…”

Scalable and tunable Y2O3‐MgO composite for infrared transparency applications

“…2,3 Recently polycrystalline IR transparent ceramics were found to have tremendous potential in IR windows and dome applications. [5][6][7] The monolithic systems like Y 2 O 3 , MgO, Al 2 O 3 , and MgAl 2 O 4 are commonly used as transparent ceramics. 2,8,9 Generally, cubic systems are preferred as there is no anisotropic scattering in cubic structure which impedes transmittance property.…”

“…Polycrystalline materials have the advantage of better mechanical property, mass‐scale production, commercially favorable 2,3 . Recently polycrystalline IR transparent ceramics were found to have tremendous potential in IR windows and dome applications 5–7 . The monolithic systems like Y 2 O 3 , MgO, Al 2 O 3 , and MgAl 2 O 4 are commonly used as transparent ceramics 2,8,9 .…”

Effect of Powder Calcination Conditions on IR Transmission in Y₂O₃-MgO Nanocomposites Fabricated by Pulsed Electric Current Sintering Technique

“…Recently, Y 2 O 3 -MgO nanocomposite ceramics have attracted much attention owing to their superior infrared (IR) transmission, low heat emissivity, high mechanical properties, moderate thermal properties and high thermal shock resistance comparable to sapphire [1][2][3][4][5][6][7][8] .…”