Tool or instrument with a wear-resistant hard coating for working or processing organic materials
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United States of America Patent
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Sep 21, 1993
Issued Date -
N/A
app pub date -
Jun 1, 1992
filing date -
Nov 22, 1989
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Abstract
A coated tool or instrument has a wear-resistant hard coating (7) which is preferably titanium nitride for working organic material which is disposed on a separating layer (9) applied on a basic body (3). The separating layer (9) comprises a ceramic electrically non-conducting material. Such a material is preferably an oxide, nitride or oxynitride of silicon. The separating layer (9) protects the basic body (3) of the tool or instrument of e.g. a non-corrosion resistant steel. During the coating of the basic body (3) with the ceramic material, a pulsating dc voltage is applied to the basic body (3) or its holders. The pulse height is changed during the vapor deposition from high negative values to low negative values.
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