Razor blade technology
View Patent ↗A razor blade including a substrate with a cutting edge defined by a sharpened tip and adjacent facets, a layer of hard coating on the cutting edge, an overcoat layer of a chromium containing material on the layer of hard carbon coating, and an outer layer of polytetrafluoroethylene coating over the overcoat layer. Also disclosed is a method of making a razor blade including providing a substrate with a cutting edge defined by a sharpened tip and adjacent facets, and applying an aqueous solution including polytetrafluoroethylene coating over the sharpened tip to result in an outer layer, the polytetrafluoroethylene having a molecular weight of about 45,000.
1. A method of making a razor blade comprising
providing a substrate with a cutting edge defined by a sharpened tip and adjacent facets, and
applying an aqueous solution including polytetrafluoroethylene coating over said sharpened tip to result in an outer layer, said polytetrafluoroethylene having a molecular weight of about 45,000, and having a primary particle size less than 0.1 micron.
2. The method of claim 1 wherein said aqueous solution contains nonionic surfactant.
3. The method of claim 1 further comprising providing a layer of hard coating on said cutting edge before said applying.
4. The method of claim 3 further comprising providing an overcoat layer of a chromium containing material on said layer of hard coating before said applying.
5. The method of claim 3 further comprising providing an interlayer on said substrate before providing said layer of hard coating.
6. The method of claim 5 wherein said interlayer comprises niobium.
7. The method of claim 5 wherein said interlayer comprises a chromium containing material.
8. The method of claim 3 wherein said hard coating comprises diamond like carbon.
9. The method of claim 4 wherein said hard coating comprises amorphous diamond.
10. The method of claim 4 wherein said hard coating layer has a thickness less than 2,000 angstroms.
11. The method of claim 4 wherein said overcoat layer is between 100 and 500 angstroms thick.
12. The blade of claim 1 wherein said outer layer is between 100 and 5,000 angstroms thick.
13. The method of claim 4 wherein said overcoat layer consists of chromium.
14. The method of claim 4 wherein said overcoat layer consists of a chromium containing alloy.
15. The method of claim 4 wherein said overcoat layer consists of a chromium platinum alloy.