Investigation on the phase stability, sintering and thermal conductivity of Sc2O3–Y2O3–ZrO2 for thermal barrier coating application
Investigation on the phase stability, sintering and thermal conductivity of Sc2O3–Y2O3–ZrO2 for thermal barrier coating application
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DOI：
10.1016/j.matdes.2009.12.019
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发表时间：
2010-06
影响因子：
8.4
通讯作者：
Huaifei Liu;Songlin Li;Qilian Li;Yongming Li
中科院分区：
文献类型：
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作者：
Huaifei Liu;Songlin Li;Qilian Li;Yongming Li
稀土氧化物共掺杂氧化锆已被开发用于热障涂层系统，以提高燃气轮机的性能和耐用性。采用化学共沉淀法合成了8mol%Sc2O3、0.6mol% y2o3稳定的ZrO2（ScYSZ）粉体。研究了ScYSZ和8wt% y2o3稳定ZrO2（8YSZ）的相稳定性、烧结性能和热物理性能。结果表明：ScYSZ和8YSZ在热处理前均表现为单一的四方相；经1500℃热处理300h后，ScYSZ具有良好的相稳定性，具有100%亚稳四方（t′）相，而8YSZ的单斜相含量达到49.4mol%。与8YSZ相比，ScYSZ具有更高的烧结阻力和更低的导热系数。ScYSZ可以被认为是TBC应用的候选材料。
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. 8mol%Sc2O3, 0.6mol%Y2O3–stabilized ZrO2(ScYSZ) powder was synthesized by chemical co-precipitation method. The phase stability, sintering resistance and thermo-physical properties of ScYSZ and 8wt%Y2O3stabilized ZrO2(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 300h, ScYSZ exhibits excellent phase stability with 100% metastable tetragonal (t′) phase, whereas the content of monoclinic phase in 8YSZ reached 49.4mol%. 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.