Transparent ceramic with complex geometry

Patent metadata

Field	Value
Publication number	US-10875812-B2
Application number	US-201615294375-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 16, 2015
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A ceramic product includes a transparent ceramic panel having a non-planar geometry including a bend having a slippage plane, an increased haze, a non-uniform thickness, or a combination thereof. A method includes providing a transparent ceramic panel, heating the panel, bending the panel to conform to a non-planar geometry.

First claim

The invention claimed is:

1. A ceramic product comprising:
a transparent ceramic panel, wherein the transparent ceramic panel comprises:
a top surface;
a bottom surface, wherein the top surface and the bottom surface have a non-planar geometry; and
a bend having a dislocation density variation localized at the apex of the bend,

wherein the transparent ceramic panel comprises a sapphire, an AlON, or a spinel, and wherein the transparent ceramic panel has a length greater than a width.

2. The ceramic product of claim 1 , wherein the non-planar geometry includes at least two bends.

3. The ceramic product of claim 1 , wherein the ceramic product is polished.

4. The ceramic product of claim 1 , wherein the ceramic product includes a transparent ceramic material comprising a sapphire.

5. The ceramic product of claim 4 , wherein the sapphire comprises a major surface that lies along an a-plane or a c-plane.

6. The ceramic product of claim 1 , wherein the non-planar geometry has a radius of curvature of no greater than 120 cm.

7. The ceramic product of claim 1 , wherein the transparent ceramic panel, prior to bending, has a length of at least 30 cm.

8. The ceramic product of claim 1 , wherein the transparent ceramic panel, prior to bending, has a width of at least 10 cm.

9. The ceramic product of claim 1 , wherein the ceramic product includes a region of low dislocation density and a region of high dislocation density, wherein the region of high dislocation density has a dislocation density of at least 10 8 dislocation lines per cm 2 .

10. The ceramic product of claim 9 , wherein the region of low dislocation density has a dislocation density of at most 500 dislocation lines per cm 2 .

11. The ceramic product of claim 6 , wherein the radius of curvature extends greater than 70% of a length of the ceramic product.

12. The ceramic product of claim 1 , wherein the non-planar geometry has a radius of curvature of no greater than 100 cm.

13. The ceramic product of claim 1 , wherein the non-planar geometry has a radius of curvature of no greater than 30 cm.

14. The ceramic product of claim 1 having a thickness variation localized at the apex of the bend.

15. The ceramic product of claim 14 , wherein the thickness variation includes a thickness that decreases approaching an apex of the bend.

16. The ceramic product of claim 14 , wherein the ceramic product includes a transparent ceramic material comprising a sapphire.

17. The ceramic product of claim 1 , wherein the bend exhibits a slippage plane.

Assignees

• Saint Gobain Ceramics

Inventors

• Haven Drew T
• Zanella Steven A
• Drouin William J

Classifications

• B28B11/005 Primary

  Using heat to allow reshaping, e.g. to soften ceramic articles · CPC title

• B28B11/003 Primary

  the shaping of preshaped articles, e.g. by bending (B28B11/08 takes precedence) · CPC title

• G02B1/00

  Optical elements characterised by the material of which they are made; Optical coatings for optical elements · CPC title

• C30B15/34

  Edge-defined film-fed crystal-growth using dies or slits · CPC title

• C30B29/38

  Nitrides · CPC title