Given the thermal expansion behavior of various materials below:

When NiBased superalloy is coated with $A{l}_2{O}_3$ at elevated temperatures using thermal spraying. Calculate the thermal stresses that may occur during cooling from $900C$ to $25C$ at the interface between coating and substrate $E_{\text{N}\text{i}\text{b}\text{a}\text{s}\text{e}\text{d}\text{s}\text{u}\text{p}\text{e}\text{r}\text{a}\text{l}\text{l}\text{o}\text{y}}=210$GPa,$E_{Al2O3}=380$GPa. The data given in the ordinate are multiplied by $100$ meaning $1\mathrm{.}8eg$ is $0\mathrm{.}018.$ Linear thermal expansion $)=(\frac{L}{L_0}$