Chemistry: electrical and wave energy – Processes and products
Patent
1989-07-31
1991-08-06
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
427180, C25D 1500, B05D 112
Patent
active
050375130
ABSTRACT:
A process for the production by electrolytic or electroless deposition on a workpiece of a composite coating comprising a metal matrix containing particles is particularly suitable for workpieces of complex geometry or having abrupt changes of shape or sharp edges such as gas turbine blades. The process in which the particles are codeposited with the metal from a solution in which the particles are insoluble comprises inducing circulation generally upwards in one zone and generally downwards in a second zone, locating the workpiece in the second zone and rotating the workpiece about an axis having a horizontal component, the rotational cycle including periods of higher angular velocity and periods of lower angular velocity, preferably a stop/go cycle. Preferably, the workpiece is also rotated about a second axis which is non-parallel with and preferably perpendicular to the first.
REFERENCES:
patent: 3830711 (1974-08-01), Kedward
patent: 4249998 (1981-02-01), Wilder
patent: 4305792 (1981-12-01), Kedward
patent: 4789441 (1988-12-01), Foster
Baj Limited
Tufariello T. M.
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