Methods of making coated glass-based parts
Making a glass-based article having a coating and a target shape which comprises a planar central portion and a perimeter portion which borders at least part of the planar central portion and extends out of the plane of the planar central portion, the perimeter portion having a perimeter edge and a target edge-to-opposite edge dimension. The method includes forming a glass-based part to provide an initial formed part having an initial three-dimensional shape that is different from the target shape for at least the target edge-to-opposite edge dimension. Applying a coating to the initial formed part to form the glass-based article having a coating, the coating imparting a stress to the initial molded part that causes a calculated, warp-induced change to the initial shape.
1. A method of making a glass-based article comprising:
forming a glass-based part comprising an initial shape that is different from a predetermined target shape for at least a target edge-to-opposite edge dimension, the initial shape comprising a planar central portion and a perimeter portion which borders at least part of the planar central portion, the perimeter portion comprising a perimeter edge;
applying a coating to the formed glass-based part, the coating imparting a stress that causes a predetermined calculated, warp-induced change to the initial shape to form the predetermined target shape; and
wherein the target edge-to-opposite edge dimension is equal to a predetermined calculated value based on a modeling calculation taking into account a thickness of the coating, a Young's modulus of the coating, and a thickness of the glass-based part comprising the initial shape.
2. The method of claim 1 , wherein the initial shape comprises a three-dimensional shape, the three-dimensional shape comprising a planar central portion and a perimeter portion which borders at least part of the planar central portion and extends out of a plane of the planar central portion.
3. The method of claim 2 , wherein the forming the glass-based article comprises forming the glass-based article in a mold comprising a molding surface, and wherein the molding surface is designed and sized to compensate for the predetermined calculated, warp-induced change to the initial shape such that the coated glass-based article comprises the predetermined target shape and the target edge-to-opposite edge dimension.
4. The method of claim 3 , wherein the predetermined target shape is three-dimensional comprising a planar central portion and a perimeter portion which borders at least part of the planar central portion and extends out of a plane of the planar central portion.
5. The method of claim 1 , wherein the glass-based part comprises a substrate selected from a group consisting of a laminated glass-based substrate, an ion-exchangeable glass-based substrate, a thermally strengthened glass-based substrate, and a combination thereof.
6. The method of claim 1 , wherein the glass-based article comprises an ion exchangeable alkali aluminosilicate glass composition.
7. The method of claim 1 , wherein the glass-based article comprises an ion exchangeable alkali aluminoborosilicate glass composition.
8. The method of claim 1 , wherein the coating imparts a compressive stress in a range of from 100 MPa to 950 MPa.
9. The method of claim 1 , wherein the coating has a thickness from 5 nanometers to 5 micrometers.
10. The method of claim 1 , wherein prior to the forming the glass-based part determining the initial shape of the glass-based part that will produce the predetermined target shape upon applying the coating to the formed glass-based part.
11. A method of making a glass-based article comprising:
forming a glass-based part comprising an initial shape that is different from a predetermined target shape for at least a target edge-to-opposite edge dimension, the initial shape comprising a planar central portion and a perimeter portion which borders at least part of the planar central portion, the perimeter portion comprising a perimeter edge;
applying a coating to the formed glass-based part, the coating imparting a stress that causes a predetermined calculated, warp-induced change to the initial shape to form the predetermined target shape;
generating a model that incorporates a thickness of the coating, a Young's modulus of the coating, a thickness of the glass-based part, and a Young's modulus of the glass-based part; and
using the model to determine the initial shape of the glass-based part that will produce the predetermined target shape of the resulting glass-based article in response to the predetermined calculated, warp-induced change to the initial shape from applying the coating, wherein the forming the glass-based part comprises using a mold comprising a molding surface to achieve the initial shape determined by using the model.