Amorphous diamond coating of blades

US5799549A · kind A · utility

Assignee

• The Gillette Company LLC · US

Inventors

• Thomas G. Decker · Wellesley, US
• Gregory P. Lundie · Westminster, US
• David L. Pappas · Waltham, US
• Richard P. Welty · Boulder, US
• C. Robert Parent · Westwood, US

Key dates

• Filing date: Mar 27, 1997
• Grant date: Sep 1, 1998
• Expiry date: Mar 27, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S76/12
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Improved razors and razor blades and processes for producing razor blades or similar cutting tools with sharp and durable cutting edges, by hard-carbon coating of blades with amorphous diamond, preferably using a filtered cathodic arc plasma source. A coating of amorphous diamond having at least 40 percent sp3 carbon bonding, a hardness of at least 45 gigapascals and a modulus of at least 400 gigapascals is applied to the sharpened edge of a substrate. The substrate may be mechanically honed, and there is no interlayer between the substrate and the amorphous diamond coating. The coating imparts stiffness and rigidity to a thin blade while maintaining a high aspect ratio.