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Blades and vanes made from Ni – and Co – base superalloys that are used in the hot section of all gas turbine engines are coated to enhance resistance to hot corrosion. The most widely used coatings are those based on the intermetallic compounds NiAl and CoAl, which are formed by diffusion interaction of aluminium with surfaces of the nickel and cobalt alloys, respectively. Simple aluminide coatings...
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