B.Zhao
,
B.X.Xu
,
J.Liu
,
Z.F.Yue
金属学报(英文版)
Indentation creep behavior with cylindrical flat indenters on the thermal barrier coating (TBC) was studied by finite element method (FEM). On the constant applied indentation creep stress, there is a steady creep rate for each case studied for different creep properties of the TBC system. The steady creep depth rate depends on the applied indentation creep stress and size of the indenters as well as the creep properties of the bond coat of the TBC and the substrate. The possibilities to determine the creep properties of a thermal barrier system from indention creep testing were discussed. As an example, with two different size indenters, the creep properties of bond coat of the TBC system can be derived by an inverse FEM method. This study not only provides a numerical method to obtain the creep properties of the TBC system, but also extends the application of indentation creep method with cylindrical flat indenters.
关键词:
thermal barrier coating (TBC) system
,
null
,
null
B.Zhao
,
F.Zeng
,
D.M.Li
,
F.Pan
金属学报(英文版)
The Cu25Nb75 and Ni45Nb55 amorphous films with about 50Onm thickness were pre-pared by ion beam assisted deposition (IBAD). Potentiodynamic polarization measure-ment was adopted to investigate the corrosion resistance of samples and the tests were carried out respectively in 1mol/L H2SO4 and NaOH aquatic solution. The corrosion performance of the amorphous films was compared with that of multilayered and pure Nb films. Experimental results indicated that the corrosion resistance of amorphous films was better than that of the corresponding multilayers and pure Nb films for both Ni-Nb system with negative heat of formation and Cu-Nb system with positive heat of formation.
关键词:
amorphous film
,
null
,
null
