Transparent ceramic with complex geometry

Patent metadata

Field	Value
Publication number	US-2020317578-A1
Application number	US-202016908102-A
Country	US
Kind code	A1
Filing date	Jun 22, 2020
Priority date	Oct 16, 2015
Publication date	Oct 8, 2020
Grant date	—

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

What is claimed is:

1 . A method of forming a ceramic product comprising:
heating a transparent ceramic panel; and bending the panel to conform to a non-planar geometry.

2 . The method of claim 1 , wherein the non-planar geometry includes a bend, having at the bend a thickness variation, a dislocation density variation, or a combination thereof.

3 . The method of claim 1 , wherein the transparent ceramic panel has a planar geometry prior to bending.

4 . The method of claim 1 , further comprising polishing the transparent ceramic panel prior to bending.

5 . The method of claim 4 , wherein the transparent ceramic panel retains at least a portion of the polish after bending.

6 . The method of claim 1 , wherein the transparent ceramic panel comprises a sapphire, an AlON, or a spinel.

7 . The method of claim 6 , wherein the transparent ceramic panel comprises a sapphire.

8 . The method of claim 7 , wherein the sapphire comprises a major surface that lies along an a-plane or a c-plane.

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

10 . The method of claim 1 , wherein the transparent ceramic panel, prior to bending, has a length of at least 35 cm.

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

12 . A method of forming a ceramic product comprising:
heating a transparent ceramic panel; and bending the panel to conform to a non-planar geometry, wherein the transparent ceramic panel, prior to bending, has a length of at least 30 cm.

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

14 . The method of claim 12 , wherein the transparent ceramic panel, prior to bending, has a width of at least 15 cm.

15 . The method of claim 12 , wherein the non-planar geometry includes a bend, having at the bend a haze variation.

16 . The method of claim 12 , wherein the non-planar geometry includes a bend, having at apex of the bend a dislocation density variation.

17 . The method of claim 12 , wherein the transparent ceramic panel has a length greater than a width.

18 . A method of forming a ceramic product comprising:
heating a transparent ceramic panel; and bending the panel to conform to a non-planar geometry, wherein the non-planar geometry includes a bend, having at the bend a thickness variation, a dislocation density variation, or a combination thereof.

19 . The method of claim 18 , wherein the transparent ceramic panel has a planar geometry prior to bending.

20 . The method of claim 18 , further comprising polishing the transparent ceramic panel prior to bending.

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

• C30B29/20

  Aluminium oxides · CPC title

• C30B29/26

  with formula BMe2O4, wherein B is Mg, Ni, Co, Al, Zn, or Cd and Me is Fe, Ga, Sc, Cr, Co, or Al · CPC title