Abstract
It is well known, that thermally grown oxide (TGO) forms at the interface between the thermal barrier top coating (TBC) and the bond coating during service. In previous work, SEM images showed that the TOO layer contained at least two layers with different oxides. One layer was Al2O 3, and the other was a mixed oxide of NiO, CoO, Cr2O 3, and their spinels. It was supposed that a reason for macro-crack formation near an interface is due to a decrease in bond strength or to the formation of stress concentration sites caused by the formation of pores in the mixed oxide. In order to improve the bond strength, a modified bond coating material was developed, which is MCrAlY with Ce and Si added. Four -point bending tests were carried out to measure the bond strength of conventional TBC and of the modified TBC with MCrAlYCeSi bond coating. As a result, the TBC with modified bond coating had a bond strength superior to the conventional one. It is likely that the reason for the superior bond strength is due to a notable difference in oxidation behavior.
| Original language | English |
|---|---|
| Pages (from-to) | 1061-1066 |
| Number of pages | 6 |
| Journal | Key Engineering Materials |
| Volume | 261-263 |
| Issue number | II |
| Publication status | Published - 2004 Jan 1 |
| Event | Advances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan Duration: 2003 Oct 20 → 2003 Oct 22 |
Keywords
- Acoustic emission
- Alumina
- Bond coatings
- Bond strength
- Interface
- Mixed oxide
- Thermal barrier coatings (TBC)
- Thermally grown oxide (TGO)
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering