C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 14/06 (2006.01)
Patent
CA 2317234
The invention provides improved razors, razor blades, and processes for producing razor blades or similar cutting tools with sharp and durable cutting edges. With this invention a hard carbon coating is applied to a blade having a cutting edge bounded by a first inclined surface and a second inclined surface, with an included blade angle enclosed by the inclined surfaces. An arc discharge is applied to an evaporable carbon surface of a cathode to generate a plasma stream of vaporized carbon in a generally directional stream resolvable into a set of roughly parallel lines. The blade to be coated is oriented within the plasma stream so that an angle measured from a line bisecting the included blade angle and one of the set of roughly parallel lines is with the range of 20° to 90°, so as to exposes one of the inclined surfaces to the plasma stream at that angle. The blade is presented to the plasma stream so that deposition of vaporized carbon occurs on both inclined surfaces of the blade cutting edge. The deposition takes place at an approximately equal rate of deposition on the two inclined surfaces. The coated blade is stiff and rigid while maintaining a high aspect ratio.
Decker Thomas G.
Lundie Gregory P.
Pappas David L.
Parent C. Robert
Welty Richard P.
Macrae & Co.
The Gillette Company
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