US 9,145,323 B2 · Molds for shaping glass and methods for making the same

Abstract

A mold for shaping glass can be made by a method that includes providing a mold body having a shaping surface comprising at least about 90% nickel and modifying the composition of the shaping surface of the mold body by exposing the shaping surface to an oxidizing heat treatment. The oxidizing heat treatment may include a ramping heat treatment, a fixed heat treatment, or both the ramping heat treatment and the fixed heat treatment. The ramping heat treatment may include increasing a heating temperature at a rate from about 20° C./hour to about 500° C./hour to a temperature from about 700° C. to about 1000° C. The fixed heat treatment may include holding the heating temperature from about 700° C. to about 1000° C. for a holding time of at least about 5 minutes.

Claims14

Dependent claims

A method of making a mold for shaping glass comprising:

providing a mold body having a shaping surface comprising at least about 90% nickel;
and
modifying the composition of the shaping surface by forming a nickel oxide layer on the shaping surface by exposing the shaping surface to an oxidizing heat treatment comprising:
a ramping heat treatment comprising increasing a heating temperature at a rate from about 20° C./hour to about 500° C./hour to a temperature from about 700° C. to about 1000° C.;
a fixed heat treatment comprising holding the heating temperature from about 700° C. to about 1000° C. for a holding time of at least about 5 minutes;
or
both the ramping heat treatment and the fixed heat treatment;
wherein the nickel oxide layer has an average thickness from about 500 nm to about 20 micron.

5 more elements

Dependencies are inferred from the claim text.

Molds for shaping glass and methods for making the same

Life of this patent

Molds for shaping glass and methods for making the same

Life of this patent

Abstract

Claims14