Abstract
Low-temperature humidity exposure of Yb2SiO5 is yet to be reported. Therefore, in this study, dense Yb2SiO5 pellets were subjected to hydrothermal degradation via water exposure (100% humidity) at 65 °C for 500 h. Scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy and Raman spectroscopy were employed to assess the pellets’ surface microstructure and to understand their water corrosion mechanisms. Prior to exposure, the pellets had minimal porosity; however, after exposure, the porosity increased significantly to 15%, with the formation of deep pit-like pores along with intergranular cracks. The Vickers hardness test was used to quantify changes in the mechanical properties as well as calculating the humidity affected depth. The residual indent and the fracture morphology of the exposed samples suggested that high humidity promoted crack propagation and spallation; however, Yb2SiO5 pellets only exhibited a slight decrease in hardness after water corrosion.
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