Coatings for glass shaping molds and molds comprising the same
AssigneeEntegris, Inc.
InventorsTroy Scoggins, Rex Gerald Sheppard
Life of this patent
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AssigneeEntegris, Inc.
InventorsTroy Scoggins, Rex Gerald Sheppard
Estimating the term…
Precision glass molds are described, which are formed by coating a mold made from high purity, fme grain sized graphite, with a coating including titanium. In various implementations, the titanium coating is overcoated with yttria (Y2O3) to provide a high precision glass mold of superior performance character. The resultant glass molds can be used to form glass articles having a highly smooth finish, for high precision applications such as consumer electronic device applications, medical instruments, and optical devices. The use of high purity, fme grain size graphite allows molds to be machined at low cost, thereby eliminating the need to fabricate a metal mold that must be coated with multiple layers including metal diffusion barrier layers to meet operational requirements for such precision applications.
-40. (canceled)
An encapsulated graphite mold body comprising:
The encapsulated graphite mold body of claim 57, where the graphite grain size is 10 microns or less than 10 microns.
The encapsulated graphite mold body of claim 57, wherein the one or more mold feature(s) include a forming surface on which the encapsulating coating is coated so that the resultant coated forming surface is configured for shaping glass in contact therewith during glass molding operation.
The encapsulated graphite mold body of claim 57, wherein the graphite body is at least partially encapsulated with the encapsulating coating, including the forming surface of the graphite body.
The encapsulated graphite mold body of claim 59, wherein the encapsulating coating comprises the titanium carbide layer or region on the graphite body and an outer layer or region of yttria.
The encapsulated graphite mold body of claim 57, wherein the encapsulating coating includes the titanium carbide layer or region on the graphite body, on which in turn is a layer or region of titanium metal, on which in turn is a layer or region of yttria.
The encapsulated graphite mold body of claim 57, wherein the encapsulation coating includes the titanium carbide layer or region on the graphite body, on which in turn is a layer or region of titanium metal, on which in turn is a layer or region of titanium oxide, on which in turn is a layer or region of yttria.
The encapsulated graphite mold body of claim 57, further comprising a pyrolyzed carbon layer or region in or under the encapsulating coating.
The encapsulated graphite mold body 57, wherein the fine-grained graphite body has a coefficient of thermal expansion in a range of from 7 to 9 parts per million/° C.
The encapsulated graphite mold body of claim 57, wherein the metal is deposited by physical vapor deposition (PVD), chemical vapor deposition (CVD), or evaporation of a metal source material.
Dependencies are inferred from the claim text.