Optical and luminescent properties of translucent YSZ ceramics manufactured using dry powder compaction under powerful ultrasound assistance

Reference	Presenter	Authors (Institution)	Abstract
09-096	Oleg L. Khasanov	Khasanov, O.L.(Tomsk Polytechnic University); Dvilis, E.S.(Tomsk Polytechnic University); Paygin, V.D.(Tomsk Polytechnic University); Polisadova, E.F.(Tomsk Polytechnic University); Stepanov, S.A.(Tomsk Polytechnic University); Valiev, D.T.(Tomsk Polytechnic University); Tolkachev, O.S.(Tomsk Polytechnic University);	Translucent yttria-stabilized zirconia (YSZ) ceramic samples have been manufactured as a matrix for luminescent ceramics. Dry commercial powders from TOSOH were compacted without any plasticizers or binders using the method of powerful ultrasound assistance (PUA) simultaneously with uniaxial static pressing [Khasanov O. et al., Adv. Appl. Ceram., 2008, No.3, p.135-141]. Optimal conditions for PUA-pressing (compaction pressure, ultrasound power) and for following free sintering (temperature, heating rate, holding time) were investigated to sinter high dense (99.2%) translucent YSZ ceramics having pure cubic phase and uniform microstructure. The SEM (JEOL JSM-7500FA), XRD (Shimadzu XRD-7000S) techniques were used to characterize the microstructure and phase composition of sintered ceramics. The high-current electron accelerator GIN-400 (average electron energy 250 keV) was applied for cathodoluminescence excitation. The integrated spectra of cathodoluminescence were recorded using AvaSpec-2048 optical fiber spectrometer (in the wavelength range 200-1100 nm). Optical transmittance in the visible and near IR regions of the ceramics consisted of about 35%. The reflection coefficient in the visible and IR for all samples was around 20%. It was shown that PUA treatment at dry powder pressing leads to the shift of the optical absorption edge of sintered YSZ ceramics to longer wavelengths, increases the luminescence intensity without changing of spectrum and so influences the spectral-kinetic cathodoluminescence characteristics. This work has been supported by the Russian Science Foundation, project No.17-13-01233.
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