Aluminum oxynitride coated article and method of making the same

US8574728B2 · kind B2 · utility

Assignee

• KENNAMETAL INC. · US

Inventors

• Volkmar Sottke · Bad Hersfeld, DE
• Hartmut Westphal · Dermbach, DE
• Hendrkus Van Den Berg · Venlo, NL
• Zhigang Ban · Latrobe, US
• Yixiong Liu · Greensburg, US
• Mark S. Greenfield · Greenville, US

Key dates

• Filing date: Mar 15, 2011
• Grant date: Nov 5, 2013
• Expiry date: Jul 2, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C29/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A coated article such as a coated cutting tool or coated wear part, which includes a substrate and a coating scheme on the substrate. The coating scheme has a titanium-containing coating layer, and an aluminum oxynitride coating layer on the titanium-containing coating layer. The aluminum oxynitride includes a mixture of phases having a hexagonal aluminum nitride type structure (space group: P63mc), a cubic aluminum nitride type structure (space group: Fm-3m), and optionally amorphous structure. The aluminum oxynitride coating layer has a composition of aluminum in an amount between about 20 atomic percent and about 50 atomic percent, nitrogen in an amount between about 40 atomic percent and about 70 atomic percent, and oxygen in an amount between about 1 atomic percent and about 20 atomic percent. The method of making the coated article includes a step of providing a substrate and depositing an aluminum oxynitride coating layer from a gaseous mixture that includes nitrogen, aluminum tri-chloride, ammonia, carbon dioxide, hydrogen chloride, optionally carbon monoxide, optionally argon, and hydrogen.