By coating metal components with intermetallics, the surface properties, such as hardness, wear- and corrosion resistance can be improved . Because of the good thermal properties and excellent YK-4-279 resistance, NiAl-Al2O3 composites can be used as oxidation-preventing bond-coats in thermal barrier coating (TBC) systems . One such application is on exhaust manifolds of heavy-duty diesel engines where the gray cast-iron, SiMo51, commonly used today, needs oxidation protection by a bond coat and thermal isolation from the exhaust gases by a thermal-barrier top-coating . The engine development, driven by increasingly restricted exhaust-emission regulations, predicts increased gas temperatures, to as high as 1000 °C, in the near future . In addition to protecting the cast-iron, insulation of exhaust gases also improves the efficiency of systems recovering energy from the hot gases. NiAl is supposed to work well as a bond coat due to its good oxidation-preventing properties  and .