Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2008-03-28
2011-12-20
Turner, Archene (Department: 1784)
Stock material or miscellaneous articles
Composite
Of inorganic material
C051S307000, C051S309000, C407S119000, C428S336000, C428S697000, C428S699000, C428S701000, C428S702000
Reexamination Certificate
active
08080323
ABSTRACT:
A coated cutting insert for use in a chip-forming material removal operation wherein the coated cutting insert includes a substrate that has a flank surface and a rake surface and the flank surface intersects the rake surface to form a cutting edge at the intersection. There is a wear-resistant coating scheme that adheres to at least a portion of the substrate. The wear-resistant coating scheme includes one or more coating layers of one or more of alumina, hafnia and zirconia. There is a wear indicating coating that adheres to at least a portion of the wear-resistant coating scheme. The wear indicating coating includes M(OxCyNz) wherein M is selected from the group comprising one or more of the following titanium, hafnium, zirconium, chromium, titanium-aluminum alloy, hafnium-aluminum alloy, zirconium-aluminum alloy, chromium-aluminum alloy, and their alloys, and x>0, y≧0, z≧0 and y+z>0. A method of making a cutting insert with wear indicating coating including the steps of: providing a substrate with an outer alumina coating layer; applying an as-deposited non-wear indicating coating layer to the alumina coating layer; and treating the non-wear indicating coating layer to convert it to a wear indicating coating layer.
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Ban Zhigang
Gates, Jr. Alfred S.
Greenfield Mark S.
Liu Yixiong
Mizgalski Kent P.
Gordon Matthew W.
Kennametal Inc.
Turner Archene
LandOfFree
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