Transparent ceramic as a component for fracture-resistant optical units

Patent metadata

Field	Value
Publication number	US-11639312-B2
Application number	US-201615736247-A
Country	US
Kind code	B2
Filing date	Jun 16, 2016
Priority date	Jun 16, 2015
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

The present invention relates to parts of transparent corundum ceramics and the production and use of said parts.

First claim

The invention claimed is:

1. A part of transparent corundum ceramic, wherein the ceramic is singly or multiply doped with at least one dopant comprising magnesium oxide, yttrium oxide, and/or lanthanum oxide, wherein a total amount of doping agent is ≤2000 ppm, the part has a thickness of <800 μm, the part is a consolidated part having a porosity <0.01%, average grain sizes D50 of the corundum ceramic in the consolidated part are <500 nm, and the part is in the shape of a wafer.

2. The part according to claim 1 , wherein the part has a haze of <10%.

3. The part according to claim 1 , wherein the part has a thickness of <500 μm.

4. A laminate, comprising a layer of the part of transparent corundum ceramic according to the invention according to claim 1 and at least one further layer of a substrate material.

5. Use of the laminate according to claim 4 for displays of dive computers, mobile telephones, tablets, notepads, or watches, watch crystals, scratch-resistant sensors, ground lights, machine windows, or camera lenses.

6. A display of a dive computer, comprising the laminate according to claim 4 .

7. A display of a mobile telephone, comprising the laminate according to claim 4 .

8. A display of a tablet, comprising the laminate according to claim 4 .

9. A display of a notepad, comprising the laminate according to claim 4 .

10. A display of a watch, comprising the laminate according to claim 4 .

11. A watch crystal, comprising the laminate according to claim 4 .

12. A scratch-resistant sensor, comprising the laminate according to claim 4 .

13. A ground light, comprising the laminate according to claim 4 .

14. A camera lens, comprising the laminate according to claim 2 .

15. The part according to claim 1 , wherein the part has a haze of <6%.

16. The part according to claim 1 , wherein the part has a haze of <3%.

17. The part according to claim 1 , wherein the part has a thickness of <250 μm.

18. The part according to claim 1 , wherein the average grain sizes D50 of the corundum ceramic in the consolidated part are <350 nm.

19. The part according to claim 1 , wherein the at least one dopant consists of magnesium oxide, yttrium oxide, and/or lanthanum oxide.

Assignees

• Ceram Etec Gmbh
• Fraunhofer Ges Forschung

Inventors

• Schnetter Lars
• Schreiner Tino
• Waidhas Jürgen

Classifications

• C04B2235/5445

  submicron sized, i.e. from 0,1 to 1 micron · CPC title

• C04B2235/605

  Making or treating the green body or pre-form in a magnetic field · CPC title

• C04B2235/785

  Submicron sized grains, i.e. from 0,1 to 1 micron · CPC title

• C04B2237/704

  of one or more of the ceramic layers or articles · CPC title

• C04B2235/787

  Oriented grains · CPC title