Acceleration of the synthesis of single B-YB2SI2O7 feedstocks through modifying the grain size of SIO2

Abstract

The purpose of this study is to create single-phase β-Yb₂Si₂O₇ feedstocks. Firstly, the single-phase β Yb₂Si₂O₇ feedstocks were synthesized by using a micro-nano compound method. By adjusting the grain size of SiO₂, the synthesis of β-Yb₂Si₂O₇ was accelerated, and its mechanism was further investigated. Based on this, the appearance and phase structure of β-Yb₂Si₂O₇ were studied, and the physical properties of β-Yb₂Si₂O₇ were characterized. The results reveal that in the solid-phase synthesis of β-Yb₂Si₂O₇, nano SiO₂ exhibits greater advantages compared to micron SiO₂ due to its nano-adsorption capacity and heightened reactivity when reacting with Yb₂O₃. This enhanced reactivity accelerates the production of β-Yb₂Si₂O₇. When the molar ratio of Yb₂O₃ and SiO₂ is 1:2.3, the single phase β-Yb₂Si₂O₇ feedstocks were effectively manufactured by sintering at 1, 500°C for one hour. The β-Yb₂Si₂O₇ feedstocks have a particle size distribution with d₁₀, d₅₀, and d₉₀ values of 20.56 μm, 33.85 μm, and 52.65 μm, respectively. The β-Yb₂Si₂O₇ feedstocks have apparent and tap densities of 1.66 g/cm³ and 2.05 g/cm³, respectively. In summary, single-phase β-Yb₂Si₂O₇ feedstocks can be the preferred materials for EBCs.