Erosion resistant blade and blade coating
Airfoil blades are disclosed having a coating thereon that includes a polyurethane, a polysiloxane, and a linking agent that promotes a connection between the polyurethane and the polysiloxane.
1. An airfoil blade having a coating disposed on a leading edge thereof, the coating comprising a polyurethane, a polysiloxane, and a linking agent that promotes a connection between the polyurethane and the polysiloxane; wherein the polyurethane and the polysiloxane are in separate layers with the linking agent disposed between the polyurethane layer and the polysiloxane layer.
2. The airfoil blade of claim 1 , wherein the linking agent is a polyurethane-polysiloxane copolymer.
3. The airfoil blade of claim 1 , wherein the linking agent is a coupling agent comprising functional groups reactive with groups on the polyurethane and functional groups reactive with groups on the polysiloxane.
4. The airfoil blade of claim 3 , wherein the coupling agent is a functionalized particle.
5. The airfoil blade of claim 1 , wherein the linking agent is a layer comprising a polyurethane-polysiloxane copolymer, disposed between the polyurethane layer and the polysiloxane layer.
6. The airfoil blade of claim 1 , wherein the linking agent is a multi-cellular structure disposed between the polyurethane layer and the polysiloxane layer.
7. The airfoil blade of claim 6 , wherein the multi-cellular structure is a polymer foam.
8. The airfoil blade of claim 7 , wherein the polymer foam is a polyurethane foam.
9. The airfoil blade of claim 1 , wherein the airfoil blade is a helicopter rotor blade.
10. The airfoil blade of claim 1 , wherein the airfoil blade further comprises polysiloxane layer on a surface of the airfoil blade away from of the leading edge.
11. An airfoil blade having a coating disposed on a leading edge thereof, the coating comprising a polyurethane, a polysiloxane, and a linking agent that promotes a connection between the polyurethane and the polysiloxane, wherein the coating comprises polyurethane segments and polysiloxane segments in a co-planar configuration in the same layer or planar segment.