Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Having wear liner – sheathing or insert
Patent
1987-05-28
1989-01-03
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Having wear liner, sheathing or insert
416241R, 22826321, 291568B, F01D 528, C23C 700
Patent
active
047953136
ABSTRACT:
A protective tip (5) for a titanium steam-turbine blade (1), comprises 28% to 40% TiC, 12% to 26% Cr+Co, 1% to 6% Mo, 3% to 8% Ni 0.3% to 1.5% Cu and a balance of Fe. The tip (5) is brazed to the blade (1) by interposing a copper-based strip (6) having a thickness lying between 7/100 mm and 15/100 mm therebetween, then raising the temperature of the blade (1) and its tip (5) to between 900.degree. C. and 950.degree. C. in a vacuum or inert atmosphere oven. This temperature is maintained for a period of between thirty minutes and seventy-five minutes, and the oven is allowed to cool to ambient temperature. Optimal brazing also serves to harden the tip (5) possesses very good resistance to abrasion by water droplets.
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patent: 4010530 (1977-03-01), Degrosso et al.
patent: 4342542 (1982-08-01), Tan et al.
patent: 4626295 (1986-12-01), Sasaki et al.
Alsthom
Garrett Robert E.
Pitko Joseph M.
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