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. 08, 2015
Filed:
Sep. 17, 2012
Walter Ag, Tubingen, DE;
Dirk Stiens, Reutlingen, DE;
Sakari Ruppi, Tubingen, DE;
Walter AG, Tübingen, DE;
Abstract
Cutting tool insert has a substrate and a coating with a total thickness of 5 to 40 μm, the coating being one or more refractory layers of which at least one layer is an α-AlOlayer having thickness of 1 to 20 μm. The length of Σ3-type grain boundaries in the at least one α-AlOlayer is more than 80% of the total length of the sum of grain boundaries of Σ3, Σ7, Σ11, Σ17, Σ19, Σ21, Σ23 and Σ29-type grain boundaries (grain boundary character distribution measured by EBSD). The at least one α-AlOlayer is deposited by chemical vapor deposition (CVD) using reaction gases comprising H, CO, AlCland X and optional additions of Nand Ar, with X being gaseous HS, SO, HF, SFor combinations thereof. The volume ratio of COand X in the CVD reaction chamber lies within the range 2<CO/X<10.