Russian Journal of Physical Chemistry A ( IF 0.7 ) Pub Date : 2021-08-22 , DOI: 10.1134/s0036024421080057 A. K. Bachina 1 , V. I. Popkov 1 , O. V. Almjasheva 2 , D. P. Danilovich 3
Abstract
Inconsistencies between ZrO2–TiO2 phase diagrams with regard to structure and phase field of the zirconium titanate existence especially in a low-temperature range motivate a detailed study of its formation. Here, nanocrystals of ZrTiO4 with scrutinyite (α-PbO2) structure were successfully synthesized by co-precipitation followed by calcination in air. The phase formation was examined in the temperature range of 25–1100°C using simultaneous thermal analysis, high-temperature diffraction, and microscopy. The crystallization of ZrTiO4 was established to occur above 700°C after complete water removal. Then nanoceramics based on ZrTiO4 were obtained via sintering of nanopowder at 1200°C for 5 h and were analyzed for thermophysical performance using laser flash analysis and thermomechanical analysis. Resulting ceramics show advanced thermal insulating properties (α = 0.138–0.187 mm2/s, λ = 5.446–11.512 W/(m K)) and low thermal expansion coefficient (CTE = (3.45–7.38) × 10–6 K–1) in the temperature range of 25–800°C which makes it promising as material for thermal barrier coatings.
中文翻译:
ZrTiO4纳米陶瓷的合成、晶体结构和热物理性质
摘要
ZrO 2 -TiO 2相图与钛酸锆存在的结构和相场之间的不一致,尤其是在低温范围内,促使对其形成进行详细研究。在这里,通过共沉淀然后在空气中煅烧成功合成了具有细密纹石(α-PbO 2)结构的 ZrTiO 4纳米晶体。使用同步热分析、高温衍射和显微镜检查在 25-1100°C 的温度范围内的相形成。在完全去除水分后,ZrTiO 4的结晶被确定为在 700°C 以上发生。然后是基于ZrTiO 4 的纳米陶瓷通过将纳米粉末在 1200°C 下烧结 5 小时获得,并使用激光闪光分析和热机械分析来分析热物理性能。所得陶瓷显示出先进的绝热性能(α = 0.138–0.187 mm 2 /s,λ = 5.446–11.512 W/(m K))和低热膨胀系数(CTE = (3.45–7.38) × 10 –6 K –1 ) 在 25–800°C 的温度范围内,这使其有望作为热障涂层材料。