Abstract
Two types of agglomerates powder with grain sizes in the submicron- /nano-range were used as the feedstock to deposit yttria partially stabilized zirconia (YPSZ) thermal barrier coatings (TBCs). The dual-modal submicron-coating and multi-modal nano-coating were fabricated. The results from thermal shock test indicated that, due to the weak bond and higher densification rate of unmelted nano-particles in the nano-coating, the interface between recrystallization zone and unmelted nano-particles linked up, which resulted in the decrease of content of unmelted nano-particles from 13% to 7%. The weak bond and higher shrinking rate of nano-particles led to the formation of coarse cracks that ran along the recrystallization zone/unmelted nano-particles interfaces. These cracks caused the premature failure of nano-coating. The submicron-coating can overcome the inherent deficiencies of nano-coating at high temperatures and show a higher thermal shock resistance, it is expected to become a candidate for high-performance TBCs.
| Original language | English |
|---|---|
| Pages (from-to) | 101-112 |
| Number of pages | 12 |
| Journal | Applied Surface Science |
| Volume | 363 |
| DOIs | |
| State | Published - 15 Feb 2016 |
Keywords
- Nano-coating
- Submicron-coating
- Thermal barrier coatings
- Thermal shock resistance
- Yttria partially stabilized zirconia