Method of producing coating using negative DC pulses with specified duty factor
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United States of America Patent
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Mar 9, 1993
Grant Date -
N/A
app pub date -
Nov 14, 1990
filing date -
Nov 22, 1989
priority date (Note) -
Expired
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Abstract
For coating workpieces having basic bodies (3), with a ceramic, electrically non-conducting material, during the coating process a pulsating dc voltage is applied to the basic bodies (3) or their holders (36). Preferably the pulse height is changed during vaporization used for the coating process, from high negative values to smaller negative values. A further layer can be applied onto the workpieces coated in this way whereby these work-pieces, due to their excellent corrosion resistance, are suited as pieces of jewelry which can be exposed in particular to ocean water and body perspiration, as rolling bodies in which the use of oil or grease as corrosion protection can be dispensed with, and as separating and cutting tools for organic materials.
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