Persistent phosphorescent composite material
AssigneeRolex SA
InventorsDetlef Berner, Romain Girod, Ollivier Pujol, Isabelle Rigot
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Abstract
The invention relates to a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases, a first phase consisting of at least one metal oxide and a second phase consisting of a metal oxide containing at least one activating element in a reduced oxidation state. The invention furthermore relates to a method for the preparation of a phosphorescent ceramic composite material as defined in any of the previous claims, the method comprising the following steps: preparing a mixture of a metal oxide and a phosphor; fabricating a green body from the mixture; and heat treating the green body in a reducing atmosphere.
Claims32
Method for the preparation of a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases,
- a first phase consisting of at least one metal oxide and
- a second phase which is a persistent phosphor, wherein the persistent phosphor consists of a metal oxide containing at least one activating element in a reduced oxidation state,
- the method comprising the following steps:
- preparing a mixture of the first and second phases;
- fabricating a green body from the mixture;
- treating the fabricated green body with a first sintering step under an oxidizing atmosphere followed by heat treating in a reducing atmosphere as the second sintering step.
Method for the preparation of a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases,
- a first phase consisting of at least one metal oxide and
- a second phase which is a persistent phosphor, wherein the persistent phosphor consists of, a metal oxide containing at least one activating element in a reduced oxidation state,
- the method comprising the following steps:
- preparing a mixture of the first and second phases;
- fabricating a green body from the mixture;
- whereby a binder material is added to the mixed material and the fabricated green body is treated in the first step by a heat treatment to remove the binder material.
Dependencies are inferred from the claim text.