Study on the Sintering Mechanism of Y₂O₃ on CaZrO₃ Ceramic

In order to research the sintering mechanism of Y₂O₃ on CaZrO₃, CaZrO₃ was synthesized by solid reaction using analytical ZrO₂ and CaCO₃ as raw materials and Y₂O₃ as additive. The liner change rate, the relative density, XRD and the microstructure of the CaZrO₃ samples were determined, and the effect of Y₂O₃ on sintering of CaZrO₃ was researched. The results show that the sintering property of CaZrO₃ is enhanced by adding Y₂O₃. When the content of Y2O3 is lower than 2 % (mass-%), the lattice volume of CaZrO₃ increases to 0.262 nm³, which is attributed to Zr⁴⁺ being replaced by Y³⁺ in the CaZrO₃ crystal. However, the content of Y₂O₃ is up to 4 %, and the lattice volume decreases due to Ca²⁺ being replaced by Y³⁺. The liner change rate of the samples increases with increasing Y₂O₃ additive. When Y₂O₃ is 4 %, the liner change rate of CaZrO₃ reaches maximum (26.9 %). The relative density of the samples increases from 63.99 to 84.45 % with increasing addition of Y₂O₃, and the average grain size of CaZrO₃ increases from 1.64 to 2.65 μm when the additive increases from 0 to 4 %.