US 11,891,976 B2
Wind turbine blade and method for manufacturing the same
Naota Watanabe, Tokyo (JP); Masaaki Shibata, Tokyo (JP); Toshikazu Shigetomi, Tokyo (JP); Hiroaki Takeuchi, Tokyo (JP); and Atsushi Yuge, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Sep. 9, 2022, as Appl. No. 17/941,427.
Application 17/941,427 is a division of application No. 16/681,871, filed on Nov. 13, 2019, granted, now 11,493,020.
Claims priority of application No. 2018-215617 (JP), filed on Nov. 16, 2018.
Prior Publication US 2023/0003187 A1, Jan. 5, 2023
Int. Cl. F03D 1/06 (2006.01); C23C 4/134 (2016.01); F03D 13/00 (2016.01)
CPC F03D 1/0675 (2013.01) [C23C 4/134 (2016.01); F03D 13/00 (2016.05)] 12 Claims
OG exemplary drawing
 
1. A wind turbine blade comprising:
a base member formed of FRP and having a blade shape;
an intermediate layer arranged on the base member and formed of metal, cermet, ceramic, or a composite material of resin and at least one of the metal, the cermet, or the ceramic; and
an erosion-resistant overcoat arranged on the intermediate layer and formed of a spray film having a porosity of 5% or lower,
wherein
the spray film forming the erosion-resistant overcoat is formed of cobalt alloy or cermet including tungsten carbide, and
the intermediate layer includes an intermediate spray film having a higher porosity than that of the spray film forming the erosion-resistant overcoat.