Erosion resistant coatings
AssigneeHontek Corporation
InventorShek C. Hong
Life of this patent
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Abstract
An erosion resistant article such as rotor blades for helicopters and wind turbines having the leading edge surface protected from damage from high speed impingement of rain or sand with a protective coating formed from specific polyurethane or polyurea coating having a defined set of minimum physical properties where the protective coating can be applied as a liquid coating and cured in place or as a preformed complementary shaped covering to protect the leading edge against erosion damage in service.
Claims17
An erosion resistant article comprising an airfoil shaped substrate having a leading edge surface exposed in use to high speed impingement of liquid or solid particles, said leading edge surface covered with a protective coating comprising:
- a polyurethane or polyurea coating selected from the group consisting of an isocyanate-terminated prepolymer cured with a curing agent, a polyisocyanate cured with a curing agent, and a water dispersion of a pre-reacted polyurethane, said curing agent selected from a group consisting of an aldimine, a ketimine, a polyaspartic ester, a polyamine, one or more polyols and mixtures thereof having a tensile strength greater than 1000 psi (70 kg/cm2), an elongation at break greater than 350%, a tensile set of less than 150%, and a Shore A hardness of 44 A to 95 A as measured at 68° F. when tested without any filler.
Dependencies are inferred from the claim text.