Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Having wear liner – sheathing or insert
Patent
1994-12-23
1996-08-06
Kwon, John T.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Having wear liner, sheathing or insert
F04D 2918
Patent
active
055428207
ABSTRACT:
An engineered ceramic component for the leading edge of a rotor blade provides enhanced erosion protection therefor. In one embodiment, the engineered ceramic component includes a strain isolator member, an aerodynamic ceramic member, a first adhesive bond layer, and a second adhesive bond layer. The strain isolator member, which is operative to minimize strain transfer between the rotor blade infrastructure and the aerodynamic ceramic member, is configured so that inner mold line surface thereof is complementary to outer mold line surface of the rotor blade infrastructure. The aerodynamic ceramic member, which is operative to provide enhanced erosion protection for the respective leading edge of the rotor blade, is configured so that the outer mold line surface thereof defines the aerodynamic configuration of the respective leading edge and the inner mold line surface is complementary to the outer mold line surface of the strain isolator member. The aerodynamic ceramic member is fabricated from an engineered ceramic material, which are defined in the present context as ceramic materials having a hardness greater than 1200 kg/mm.sup.2 and an average flexural strength equal to or greater than 40 ksi. The first adhesive bond layer is operative to bond the strain isolator member to the rotor blade infrastructure and the second adhesive bond layer is operative to bond the aerodynamic ceramic member to the strain isolator member. In another embodiment, the engineered ceramic member includes the aerodynamic ceramic member described hereinabove and a thick adhesive layer. The thick adhesive layer is operative to minimize strain transfer between the rotor blade infrastructure and the aerodynamic ceramic member and to bond the aerodynamic ceramic member in combination with the rotor blade infrastructure.
REFERENCES:
patent: 3999888 (1976-12-01), Zincone
patent: 4097193 (1978-06-01), Brunsch et al.
patent: 4842663 (1989-06-01), Kramer
patent: 4895491 (1990-01-01), Cross
Eaton Harry E.
Holowczak John E.
Reinfelder William C.
Kwon John T.
Radke Terrance J.
United Technologies Corporation
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