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Preventing Silicon Corrosion

IP.com Disclosure Number: IPCOM000083294D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

Silicon ink jet nozzles suffer attack by the combination of a pH9 alkaline ink and an imposed voltage. The cracks in the SiO(2) coating let the ink erode the Si when the Si is a cathode. Experiments show the rate of attack is very slow when bare Si is an anode, very fast when a cathode.

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Preventing Silicon Corrosion

Silicon ink jet nozzles suffer attack by the combination of a pH9 alkaline ink and an imposed voltage. The cracks in the SiO(2) coating let the ink erode the Si when the Si is a cathode. Experiments show the rate of attack is very slow when bare Si is an anode, very fast when a cathode.

A method of preventing attack is to impose a fixed potential between the Si nozzle and the ink, so that the Si is always positive.

This can be accomplished with a gold or platinum cathode placed in the ink. Connection is made to a low current, 1.0 to 2.0 volt supply and to the silicon. For inks of lower pH (< 7), other bias conditions may need to be specified; even these inks (magnetic) could be made pH > 7.

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