Cutting tool with oxide coating
AssigneeWalter AG
InventorVeit Schier
Life of this patent
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Abstract
By using the PVD process, cutting tools are provided with a coating that is a mono-phase ternary or more complex oxide. By appropriately defining the involved major component and minor component in terms of atom percent, the distortions of the formed oxide can be controlled in a specific manner and in order to influence the properties of said oxide. Alternatively, the layer may contain an amorphous oxide phase with oxide crystallites embedded therein. The oxide crystallites may be binary, ternary or more complex. One or more different types of crystallites may be present adjacent to each other.
Claims7
A cutting tool comprising a base body, which supports a layer system comprising at least one mono-phase metastable at least ternary oxide layer, wherein the at least one mono-phased metastable at least ternary oxide layer is produced using a physical vapor deposition process (PVD),
- wherein the at least one mono-phased metastable at least ternary oxide layer is a substitution mixed crystal,
- wherein the at least one mono-phased metastable at least ternary oxide layer includes a main component and at least one minor component,
- wherein the main component forms a predominant proportion and the at least one minor component forms a smaller proportion of more than 1 atomic percent and up to 4 atomic percent,
- wherein the main component is aluminum and the at least one minor component is chromium, titanium, or zirconium, and
- wherein the at least one mono-phased metastable at least one ternary oxide layer has the structure of a γ-aluminum oxide layer.
Dependencies are inferred from the claim text.