Investigation on the phase stability, sintering and thermal conductivity of Sc2O3–Y2O3–ZrO2 for thermal barrier coating application

✍ Scribed by Huaifei Liu; Songlin Li; Qilian Li; Yongming Li

• Publisher: Elsevier Science
• Year: 2010
• Weight: 420 KB
• Volume: 31
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2009.12.019

✦ Synopsis

Rare earth oxides co-doped zirconia have been developed for application in thermal barrier coating systems to promote the performance and durability of gas turbines. 8 mol%Sc 2 O 3 , 0.6 mol%Y 2 O 3 -stabilized ZrO 2 (ScYSZ) powder was synthesized by chemical co-precipitation method. The phase stability, sintering resistance and thermo-physical properties of ScYSZ and 8 wt%Y 2 O 3 stabilized ZrO 2 (8YSZ) were investigated. The results indicated that both ScYSZ and 8YSZ show single tetragonal phase before heat treatment. After heat treating at 1500 °C for 300 h, ScYSZ exhibits excellent phase stability with 100% metastable tetragonal (t 0 ) phase, whereas the content of monoclinic phase in 8YSZ reached 49.4 mol%. ScYSZ also exhibits higher sintering resistance and lower thermal conductivity than 8YSZ. ScYSZ can be considered to be explored as candidate material for TBC application.