Influence of sulfuric acid doping on sintering behaviors of nano-Yttria powder and production of transparent ceramics
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The present study investigated the effects of sulfuric acid doping on the structure, morphology, and sintering behavior of nanoY2O3 powders. The sintering kinetics of the resultant compacts during the initial sintering stage were assessed, using constantrates of heating (CRH). Compared to the undoped Y2O3 powder, the powder doped with sulfuric acid exhibited improvednano-scale uniformity in particle size and enhanced homogeneity in particle dispersion. The introduction of sulfuric acid asa dopant significantly boosted the densification rate of Y2O3 at temperatures exceeding ~1350 °C. This addition decreasedthe activation energy required for sintering and transformed the diffusion mechanism, shifting it from grain boundary (GB)diffusion to volume diffusion (VD) during the initial sintering stage. Microstructural and optical characterization of asfabricatedceramics were employed to further evaluate the sintering behavior of powders. When being sintered at 1500 ℃in vacuum, a homogeneous microstructure was observed in the ceramic derived from the doped Y2O3 powder, whereas largeamounts of pores were presented in the undoped sample. At a sintering temperature of 1700 ℃ for 5 h, the undoped ceramicappeared opaque, while the doped sample exhibited remarkable transparency, achieving a transmittance of approximately74% at a wavelength of 2000 nm.
Abstract
The present study investigated the effects of sulfuric acid doping on the structure, morphology, and sintering behavior of nanoY2O3 powders. The sintering kinetics of the resultant compacts during the initial sintering stage were assessed, using constantrates of heating (CRH). Compared to the undoped Y2O3 powder, the powder doped with sulfuric acid exhibited improvednano-scale uniformity in particle size and enhanced homogeneity in particle dispersion. The introduction of sulfuric acid asa dopant significantly boosted the densification rate of Y2O3 at temperatures exceeding ~1350 °C. This addition decreasedthe activation energy required for sintering and transformed the diffusion mechanism, shifting it from grain boundary (GB)diffusion to volume diffusion (VD) during the initial sintering stage. Microstructural and optical characterization of asfabricatedceramics were employed to further evaluate the sintering behavior of powders. When being sintered at 1500 ℃in vacuum, a homogeneous microstructure was observed in the ceramic derived from the doped Y2O3 powder, whereas largeamounts of pores were presented in the undoped sample. At a sintering temperature of 1700 ℃ for 5 h, the undoped ceramicappeared opaque, while the doped sample exhibited remarkable transparency, achieving a transmittance of approximately74% at a wavelength of 2000 nm.
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