Coated cutting insert and method for making the same

US8668982B2 · kind B2 · utility

Assignee

• KENNAMETAL INC. · US

Inventors

• Peter R. Leicht · Latrobe, US
• Mark S. Greenfield · Greenville, US
• Volkmar Sottke · Bad Hersfeld, DE
• Zhigang Ban · Latrobe, US
• Hartmut Westphal · Dermbach, DE
• Yixiong Liu · Greensburg, US
• Michael Frank Beblo · Delmont, US

Key dates

• Filing date: Nov 18, 2011
• Grant date: Mar 11, 2014
• Expiry date: Jun 7, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated cutting insert for removing material from a workpiece that includes a substrate is disclosed. A wear-resistant coating on the substrate that includes an alumina layer and a Zr- or Hf-carbonitride outer layer deposited on the alumina layer. The Zr- or Hf-carbonitride outer layer is subjected to a post-coat wet blasting treatment. The wet blasting changes the stress condition of the exposed alumina coating layer from an initial tensile stress condition to a compressive stress condition.