Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1981-11-17
1983-03-01
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412975, C25F 302
Patent
active
043753965
ABSTRACT:
A method is described for forming sharp tips on thin wires, in particular phosphor bronze wires of diameters such as one-thousandth inch used to contact micron size Schottky barrier diodes, which enables close control of tip shape and which avoids the use of highly toxic solutions. The method includes dipping and end (12) of a phosphor bronze wire (14) into a dilute solution (16) of sulfamic acid and applying a current through the wire to electrochemically etch it. The humidity in the room is controlled to a level of less than 50%, and the voltage applied between the wire (14) and another electrode (18) in the solution is a half wave rectified voltage. The current through the wire is monitored, and the process is stopped when the current falls to a predetermined low level.
REFERENCES:
patent: 2628936 (1953-02-01), Albano
patent: 3006827 (1961-10-01), Capuano
Beggs James M. Administrator of National Aeronautics and Space
Green Gordon
Mattauch Robert J.
Jones Thomas H.
Kaplan G. L.
Manning John R.
McCaul Paul F.
Nguyen Nam X.
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