GLASS-CERAMIC WHICH IS AT LEAST PARTLY PROVIDED WITH A HARD MATERIAL LAYER
First Claim
1. A glass-ceramic comprising:
- a hard material layer that protects against external mechanical influences at least partially provided on the glass-ceramic,wherein the hard material layer comprises at least two phases that are present side by side and are mixed with one another, the at least two phases comprising at least one nanocrystalline phase and one amorphous phase,wherein the hard material layer has a hardness of at least 26 GPa and a layer thickness of at least 0.5 μ
m, is chemically resistant in the temperature range from 200°
C. to 1000°
C., and has a coefficient of thermal expansion (α
) that does not differ by more than +/−
20% from a coefficient of thermal expansion (α
) of the glass-ceramic.
1 Assignment
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Accused Products
Abstract
Glass-ceramic is provided that is at least partly provided with a hard material layer to protect against external mechanical influences. The hard material layer contains at least two phases, which are present side by side and are mixed with one another. The at least two phases include at least one nanocrystalline phase and one amorphous phase. The hard material layer has a hardness of at least 26 GPa and a layer thickness of at least 0.5 μm. The hard material layer is chemically resistant in the temperature range from 200° C. to 1000° C. The coefficient of thermal expansion (α) of the glass-ceramic does not differ by more than +/−20% from the coefficient of thermal expansion (α) of the hard material layer.
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Citations
23 Claims
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1. A glass-ceramic comprising:
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a hard material layer that protects against external mechanical influences at least partially provided on the glass-ceramic, wherein the hard material layer comprises at least two phases that are present side by side and are mixed with one another, the at least two phases comprising at least one nanocrystalline phase and one amorphous phase, wherein the hard material layer has a hardness of at least 26 GPa and a layer thickness of at least 0.5 μ
m, is chemically resistant in the temperature range from 200°
C. to 1000°
C., and has a coefficient of thermal expansion (α
) that does not differ by more than +/−
20% from a coefficient of thermal expansion (α
) of the glass-ceramic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification