Effect of pre-aluminization on the properties of ZrO2-8wt.% Y2O3/Co-29Cr-6Al-1Y thermal-barrier coatings |
| |
| Authors: | W. Lih E. Chang C. H. Chao M. L. Tsai |
| |
| Affiliation: | (1) Department of Materials Engineering, National Cheng-Kung University, Tainan, Taiwan R.O.C.;(2) Aero Industry Development Center, Aero Engine Factory, Kang-San, Taiwan, R.O.C. |
| |
| Abstract: | Specimens of investment-cast Mar-M247 superalloy were vacuum-plasma sprayed with Co-29Cr-6Al-1Y bond coat, and part of the specimens were further pre-aluminized at 980°C for 2, 4, 6, 8, and 10 hours. All the specimens were then deposited with ZrO2-8 wt.% Y2O3 thermal-barrier coatings (TBCs) and thermally cycled at 1050°C to evaluate the effect of time of the prealuminizing treatment on the performance and failure mechanism of the modified system. Results showed that TBC specimens with pre-aluminized bond coatings exhibited lower oxidation rates and significantly higher cyclic life when compared with unaluminized specimens. The failure of bond-coat pre-aluminized TBC specimens was observed to propagate mainly along the lamellar splats of the top coat, whereas the failure of conventional TBC specimens occurred mainly along the top-coat/spinel oxides interface. |
| |
| Keywords: | thermal-barrier coatings pre-aluminized Co-Cr-Al-Y bond coat thermal-cyclic oxidation |
| 本文献已被 SpringerLink 等数据库收录！ |
|
