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

• Published in: Powder technology 2023-06, Vol.423, p.118494, Article 118494
• Main Authors: Li, Kaiyun, Li, Hantao, Huang, Shuo, Luo, Xuewei, Jin, Hongyun
• Format: Article
• Language: English
• Subjects: Solid state reaction; SrY2O4; Thermal barrier coatings; Thermal properties
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2023.118494

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. [Display omitted] •Pure SrY2O4 was obtained by solid-state method at an ultra-low 950 °C.•The SrY2O4 were remained pure phase at 1600 °C continuous sintering 50 h.•The SrY2O4 has high thermal expansion coefficient and low thermal conductivity.