The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 1999
Filed:
Nov. 09, 1995
A Bruce DeWald, Jr, Hickory, NC (US);
Kenneth Lewis Beattie, Lake Ridge, VA (US);
Diamond Black Technologies, Inc., Durham, NC (US);
Abstract
A coating of cubic boron nitride dispersed in a matrix of disordered boron and carbon, such as boron carbide, is provided by sputtering. The coating is wear resistant, adherent, lubricous, and suitable as a coating for tools, molds, and wear parts. The coating has first, second, and third regions. The first region is sputtered in an inert atmosphere onto a substrate such as tool steel and is at least one layer of disordered boron and carbon. The inert sputtering atmosphere is gradually replaced with nitrogen to form the second region, which has cubic boron nitride crystals in a gradually increasing concentration dispersed in a matrix of disordered boron and carbon. The third region atop the second region is an outer wear layer that has a substantially uniform concentration throughout of cubic boron nitride dispersed in disordered boron and carbon.