Ultra-low temperature solid-state synthesis of single-phase SrY2O4 for thermal-barrier-coating applications

Abstract

Due to the thermal and chemical stability, SrY2O4 has a potential to be utilized as thermal barrier coatings materials. Unfortunately, the relative high synthesis temperature (> 1425 °C) of SrY2O4 leads to high energy consumption limits its industrial production. To address this issue, a novel and easy fabricating approach for single-phased SrY2O4 was explored at ultra-low temperature of 950 °C, in which isopropanol was used to disperse the powder slurry by ball milling. The XRD and high-resolution TEM results demonstrated that the obtained SrY2O4 possesses an anti-spinel orthorhombic crystal structure. In addition, SrY2O4 has good phase stability and high thermal expansion coefficient (11.06 × 10−6 K−1, RT ∼ 1200 °C) at high temperature, which implies that it is a good choice for thermal barrier coatings.