Type of Shell

Inner FGM layer

Isotropic Layer

Outer FGM layer

Shell I

Nickel-Zarconia

Stainless Steel

Nickel-Zarconia

Shell II

Nickel-Zarconia

Stainless Steel

Zarconia-Nickel

Shell III

Zarconia-Nickel

Stainless Steel

Nickel-Zarconia

Shell IV

Zarconia-Nickel

Stainless Steel

Zarconia-Nickel