材料科学
热障涂层
复合材料
温度循环
氧化钇稳定氧化锆
热冲击
微观结构
大气压等离子体
分层(地质)
断裂力学
开裂
立方氧化锆
等离子体
法律工程学
热的
图层(电子)
陶瓷
物理
气象学
古生物学
工程类
生物
构造学
量子力学
俯冲
作者
M. Karger,Robert Vaßen,D. Stöver
标识
DOI:10.1016/j.surfcoat.2011.06.032
摘要
Thermal barrier coatings (TBCs) with high strain tolerance are favorable for application in hot gas sections of aircraft turbines. To improve the strain tolerance of atmospheric plasma sprayed (APS) TBCs, 400 μm–500 μm thick coatings with very high segmentation crack densities produced with fused and crushed yttria stabilized zirconia (YSZ) were developed. Using a Triplex II plasma gun and an optimized spraying process, coatings with segmentation crack densities up to 8.9 cracks mm− 1, and porosity values lower than 6% were obtained. The density of branching cracks was quite low which is inevitable for a good inter-lamellar bonding. Thermal cycling tests yielded promising strain tolerance behavior for the manufactured coatings. Samples with high segmentation crack densities revealed promising lifetime in burner rig tests at rather high surface (1350 °C) and bondcoat temperatures (up to 1085 °C), while coatings with lower crack densities had a reduced performance. Microstructural investigations on cross-sections and fracture surfaces showed that the segmentation crack network was stable during thermal shock testing for different crack densities. The main failure mechanism was delamination and horizontal cracking within the TBC near the thermal grown oxide layer (TGOs) and the TBC.
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