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-Yb 2 Si 2 O 7 feedstocks. Firstly, the single-phase β Yb 2 Si 2 O 7 feedstocks were synthesized by using a micro-nano compound method. By adjusting the grain size of SiO 2 , the synthesis of β-Yb 2 Si 2 O 7 was accelerated, and its mechanism was further investigated. Based on this, the appearance and phase structure of β-Yb 2 Si 2 O 7 were studied, and the physical properties of β-Yb 2 Si 2 O 7 were characterized. The results reveal that in the solid-phase synthesis of β-Yb 2 Si 2 O 7 , nano SiO 2 exhibits greater advantages compared to micron SiO 2 due to its nano-adsorption capacity and heightened reactivity when reacting with Yb 2 O 3 . This enhanced reactivity accelerates the production of β-Yb 2 Si 2 O 7 . When the molar ratio of Yb 2 O 3 and SiO 2 is 1:2.3, the single phase β-Yb 2 Si 2 O 7 feedstocks were effectively manufactured by sintering at 1, 500°C for one hour. The β-Yb 2 Si 2 O 7 feedstocks have a particle size distribution with d 10 , d 50 , and d 90 values of 20.56 μm, 33.85 μm, and 52.65 μm, respectively. The β-Yb 2 Si 2 O 7 feedstocks have apparent and tap densities of 1.66 g/cm 3 and 2.05 g/cm 3 , respectively. In summary, single-phase β-Yb 2 Si 2 O 7 feedstocks can be the preferred materials for EBCs.