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:
Dec. 16, 1997
Filed:
May. 15, 1995
Scott M Packer, Pleasant Grove, UT (US);
Arturo A Rodriguez, Bloomfield, MI (US);
Stefan Ederyd, Saltsjoboo, SE;
Ghanshyam Rai, Sandy, UT (US);
Smith International, Inc., Houston, TX (US);
Sandvik AB, Sandviken, SE;
Abstract
A cutting tool for woodworking applications has a tungsten carbide substrate and a hard layer bonded to the substrate at high temperature and high pressure, i.e. where diamond or cubic boron nitride is thermodynamically stable. The hard layer comprises polycrystalline diamond or polycrystalline cubic boron nitride, and a supporting cobalt phase including adjuvant alloying materials for providing oxidation and corrosion resistance. Typical alloying elements include nickel, aluminum, silicon, titanium, molybdenum and chromium. Such materials also retard transformation of cobalt from the HCP to the FCC crystal structure at high temperature. The hard layer has an as-pressed surface parallel to the substrate and is only about 0.3 millimeters thick. An additional secondary phase including a carbide, nitride and carbonitride of metals such as titanium may also be present in the PCD or PCBN layer.