METHOD OF MAKING A COATED CERAMIC CUTTING INSERT

  • US 20130260035A1
  • Filed: 06/03/2013
  • Published: 10/03/2013
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
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1. A method of making a coated ceramic cutting insert comprising the steps of:

  • providing a ceramic substrate wherein the ceramic substrate being selected from the group consisting of silicon nitride-based ceramics and silicon aluminum oxynitride-based ceramics, the ceramic substrate having a rake surface and at least one flank surface, and a cutting edge formed at the juncture between the rake surface and the flank surface;

    forming a pre-blast coated member comprising the ceramic substrate and a pre-blasted coating scheme, and wherein the pre-blasted coating scheme is deposited by the following steps;

    depositing on the surface of the ceramic substrate by chemical vapor deposition an alumina-containing base coating layer region, and the alumina-containing base coating layer region comprising at least one outermost alumina coating layer;

    depositing on the alumina-containing base coating layer region by chemical vapor deposition a titanium-containing outer coating layer region comprising at least one titanium-based coating layer; and

    wet blasting off the titanium-containing outer coating layer region thereby exposing the outermost alumina coating layer to form an exposed alumina coating layer and changing the stress condition of the exposed outermost alumina coating layer from an initial stress condition ranging between about 50 MPa (tensile stress) and about 800 MPa (tensile stress) as measured by as measured by XRD using the Psi tilt method and the (024) reflection of alumina to a blasted stress condition ranging between about 50 MPa (tensile stress) and about −

    2 GPa (compressive stress) as measured by XRD using the Psi tilt method and the (024) reflection of alumina.

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