Method for reinforcing transparent ceramics, and ceramic
AssigneeForschungszentrum Juelich GmbH
InventorsOlivier Guillon, Marc Rubat Du Merac, Martin Bram
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Abstract
A method for producing a transparent polycrystalline ceramic includes forming at least one planar transparent region near a surface within the ceramic, wherein the at least one planar transparent region has a lower thermal expansion coefficient than other regions of the ceramic. The method further includes generating compressive stresses in the at least one planar transparent region near the surface after a thermal treatment and cooling.
Claims17
A transparent polycrystalline ceramic, comprising:
- a polycrystalline transparent ceramic body formed of a substrate material, the substrate material being a YSZ ceramic, wherein the YSZ ceramic is ZrO2 doped with Y2O3, wherein the YSZ ceramic is 8-YSZ;
- and
- a transparent ceramic surface region having a coating formed of Y2O3,
- wherein a thermal expansion coefficient ratio of a thermal expansion coefficient of the polycrystalline transparent ceramic body to a thermal expansion coefficient of the transparent ceramic surface region is greater than 1,
- wherein the thermal expansion coefficient ratio provides a compressive stress in the transparent ceramic surface region and further provides a tensile stress in the polycrystalline ceramic body, and
- wherein a ratio of the compressive stress to the tensile stress exceeds 25.
A transparent polycrystalline ceramic, comprising:
- a polycrystalline transparent ceramic body formed of a substrate material, the substrate material being a YSZ ceramic, the YSZ ceramic being ZrO2 doped with Y2O3;
- and
- a transparent ceramic surface region having a coating formed of pure Y2O3,
- wherein a thermal expansion coefficient ratio of a thermal expansion coefficient of the polycrystalline transparent ceramic body to a thermal expansion coefficient of the transparent ceramic surface region is greater than 1, and
- wherein the thermal expansion coefficient ratio provides a compressive stress in the transparent ceramic surface region.
A transparent polycrystalline ceramic, comprising:
- a polycrystalline transparent ceramic body formed of a substrate material, the substrate material being a YSZ ceramic, the YSZ ceramic being ZrO2 doped with Y2O3;
- and
- a transparent ceramic surface region having a coating formed of Y2O3,
- wherein a thermal expansion coefficient ratio of a thermal expansion coefficient of the polycrystalline transparent ceramic body to a thermal expansion coefficient of the transparent ceramic surface region is greater than 1, and
- wherein the thermal expansion coefficient ratio provides a compressive stress in the transparent ceramic surface region, and
- wherein the compressive stress is in a range of 150 to 750 MPa.
Dependencies are inferred from the claim text.