Gas turbine rotor bimetallic ring seal and method therefor
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United States of America Patent
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Apr 2, 2002
Grant Date -
N/A
app pub date -
Oct 21, 1999
filing date -
Oct 21, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for making a bimetallic ring seal having a nickel core covered by a first layer of platinum having a inner dense portion and a second outer portion both of which plastically deform in the presence of a load. The method includes the step of applying a porous layer of platinum over the dense layer by electroless plating in a platinum bath comprising 0.8-1.2 gram/liter platinum as diammine dinitrite salt Pt(NH.sub.3).sub.2 (NO.sub.2).sub.2, 50-100 milliliter/liter of 25% ammonium hydroxide NH.sub.4 OH; and 0.3-1.5 gram/liter hydrazine hydrate N.sub.2 H.sub.4 --H.sub.2 O, at a temperature in the range of 75-90.degree. C. and at a plating rate in the range of 0.5-3.0 micron/hour and then plastically deforming the ring seal under load.
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