Abstract
The low-pressure plasma spray coating process has been established in the field of gas turbines and is used for parts (turbine blades, duct segments, etc. ) which are exposed to corrosive gases at high temperatures. Overlay coatings based on the MCrAlY alloy system (M is Ni, Co or Fe) are commonly employed as oxidation-and corrosion-resistant coatings. Crack growth behaviors of coatings from coated surface to substrate were analyzed in terms of the stress intensity factors using the finite-element method. Prevention of crack growth from the coated surface to the substrate was also investigated by measuring Young's modulus and thermal expansion coefficient for eleven kinds of MCrAlY alloy coatings, which were sprayed by the low-pressure plasma spray and heat-treated at 1393 K for 2 h in Ar atmosphere. Results showed that the MCrAlY coatings with low Young's modulus and low thermal expansion coefficient were useful for preventing crack growth from the coated surface to the substrate
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