Zirconia based ceramic article as wear-resistant exterior part for wristwatch
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United States of America Patent
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Jul 27, 1999
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N/A
app pub date -
Dec 10, 1997
filing date -
Dec 23, 1996
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Abstract
The invention concerns a zirconia based ceramic 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 said article, the thickness of said superficial layer including a plurality of regions of which one external region is formed of zirconium carbide having a metallic appearance.
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