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US 6,270,907 B1Granted
Zirconia based article, use of such an article as a wear resistant exterior part for a wristwatch and method for obtaining such an article
AssigneeAsulab S.A.
InventorBéatrice Michel
Life of this patent
Estimating the term…
Abstract
A zirconia based article having a core of ZrO2 and/or partially reduced ZrO2, characterized in that it includes, over at least part of its surface, a superficial layer integral with the article, the thickness of the superficial layer including a plurality of regions of which one external region is formed of zirconium nitride having a gold metallic appearance.
Claims10
A wear resistant article, comprising:
- a core consisting of one or more elements selected from the group consisting of ZrO2 and partially reduced ZrO2 and
- an integral superficial layer over at least part of a surface of the core, said superficial layer including at least one external region formed of zirconium nitride having a brilliant, gold metallic appearance, said wear resistant article having a mirror polished surface.
A wear resistant article, comprising:
- a core consisting of one or more elements selected from the group consisting of ZrO2 and partially reduced ZrO2;
- and
- an integral superficial layer over at least part of a surface of the core, said superficial layer including at least one external region formed of zirconium nitride having a brilliant, gold metallic appearance, the superficial layer including a transition region situated between the core and the external region, said transition region including zirconium oxynitrides, the thickness of the superficial layer being between approximately 100 and 1,000 nm.
A wear resistant article, comprising:
- a core consisting of one or more elements selected from the group consisting of ZrO2 and partially reduced ZrO2;
- and
- an integral superficial layer over at least part of a surface of the core, said superficial layer including at least one external region formed of zirconium nitride having a brilliant, gold metallic appearance, the thickness of the external region of zirconium nitride being approximately between 20 and 150 nm.
Dependencies are inferred from the claim text.