Effect of thermal treatment at high temperature on phase stability and transformation of Yb2O3 and Y2O3 co-doped ZrO2 ceramics

Abstract

Y2O3 doped ZrO2 (YSZ) ceramic material is used to protect alloy components worked in high-temperature. But its phase transformation between tetragonal phase and monoclinic phase occurred at 1150 °C leads to YSZ invalid. Therefore, enhancing the phase stability of YSZ is necessary for meeting the demands of the development of thermal barrier coatings (TBC). In this study, X-ray diffraction and Raman spectra were used to explore the phase stability and phase transformation of Yb2O3 and Y2O3 co-doped ZrO2 (YbYSZ) ceramics after heat treatment at 1300 °C with different times. The stability of tetragonal phase is improved by tetragonality decreasing with Yb3+ doped. Simultaneously, the incorporation of Yb3+ leads to O–O coupling, which is beneficial for increasing the concentration of oxygen vacancies near the substituted ions, thereby improving the stability of the crystal. The 6.5YbYSZ ceramic has the best stability after heat treatment at 1300 °C for different times.

Low Overpotential Amperometric Sensor Using Yb2O3.CuO@rGO Nanocomposite for Sensitive Detection of Ascorbic Acid in Real Samples

“…However, the presence of carbon in Yb 2 O 3 .CuO@rGO was established by XPS, EDS, SEM, and TEM. Figure 2 b shows the Raman spectra, where bands at 359.3, 718, and 1060 cm −1 can be related to Yb 2 O 3 , while bands at 328 and 850 cm −1 were connected to CuO [ 57 ]. The characteristic carbon bands at 1344 and 1676 cm −1 are related to the D and G bands of rGO [ 58 ].…”

Low Overpotential Amperometric Sensor using Yb2O3.CuO@rGO Nanocomposite for Sensitive Detection of Ascorbic Acid in Real Samples

“…Fig. 2b shows the Raman spectra, where bands at 359.3, 718, and 1060 cm -1 can be related to Yb2O3; while bands at 328, and 850 cm -1 were connected to CuO [57]. Characteristic carbon bands at 1344 and 1676 cm -1 are related to D and G bands of rGO [58].…”

A study on thermal behaviour of thermal barrier coating: investigation of particle size, YSZ/polysilazane, time and temperature curing effect

“…The existence of the tetragonal YSZ phase indicates the high stability of YSZ when exposed to high temperatures compared to other phases. 41 Fig. 3 shows that there are two phases in ZrO 2 , namely t-ZrO 2 is the phase required in the coating process and m-ZrO 2 .…”