Ceramics wringing

Abstract

The object of the present invention is an integrally bonded composite component, a method for the production thereof, and the use thereof. The invention particularly relates to integrally bonded transparent ceramic composite components, to a method for the production of such ceramic composite components, and to the use thereof.

Claims

1. The composite component created by bonding of first and second components, wherein the first component is a transparent technical ceramic having a surface bonded to the second component, the surface of the first component bonded to the second component having an evenness of <10 m and a roughness r.sub.a<20 nm, and the second component comprises a ceramic, a glass, or a plastic, wherein the first and second components are bonded without using a bonding material at a temperature between room temperature and a temperature below a melting/softening temperature of the first component and below a melting/softening temperature of the second component, and wherein the second component is made of a material different from the material of which the first component is made.

2. The composite component according to claim 1, wherein the first and second components are integrally bonded to each other, forming a chemical reaction zone.

3. The composite component according to claim 1, wherein the second component is selected from a ceramic that is a second technical ceramic, a glass which is pretensioned by pressure in a layer near a surface, or a glass that is a hardened glass.

4. The composite component according to claim 1, wherein the transparent technical ceramic has a polycrystalline structure.

5. A composite component created by bonding of first and second components, wherein the first component is a transparent technical ceramic having a surface bonded to the second component, the surface of the first component bonded to the second component having an evenness of <10 m and a roughness r.sub.a<20 nm, and the second component comprises a ceramic, a glass, or a plastic, wherein the first and second components are bonded without using a bonding material at a temperature between room temperature and a temperature below a melting/softening temperature of the first component and below a melting/softening temperature of the second component, and wherein the first component has a thickness <1 mm.

6. The composite component according to claim 1, wherein the transparent technical ceramic comprises MgAl spinel (MgAl.sub.2O.sub.4) or polycrystalline aluminum oxide (-Al.sub.2O.sub.3).

7. The composite component according to claim 1, wherein the composite component is transparent.

8. The composite component according to claim 1, wherein the composite component is transparent and has an RIT >60%, spot frequencies <10%, and haze <10%.

9. A display comprising the composite component according to claim 1.

10. An oven or chimney window display comprising the composite component according to claim 1.

11. The composite component according to claim 5, wherein the first component has a thickness <0.5 mm.

12. The composite component according to claim 5, wherein the first component has a thickness <0.1 mm.

13. The composite component according to claim 5, wherein the first component has a thickness <300 m.

14. The composite component according to claim 5, wherein the first component has a thickness <200 m.

15. The composite component according to claim 5, wherein the first component has a thickness <100 m.

16. The composite component according to claim 1, wherein a surface of the second component bonded to the first component has an evenness of <10 m.

17. The composite component according to claim 1, wherein the surface of the first component bonded to the second component and a surface of the second component bonded to the first component both have an evenness of <1 m.

18. The composite component according to claim 1, wherein the surface of the first component bonded to the second component and a surface of the second component bonded to the first component both have an evenness of <100 nm.

19. The composite component according to claim 1, wherein the surface of the first component bonded to the second component and a surface of the second component bonded to the first component both have a roughness r.sub.a<20 nm.

20. The composite component according to claim 1, wherein the surface of the first component bonded to the second component and a surface of the second component bonded to the first component both have a roughness ra<10 nm.

21. The composite component according to claim 1, wherein the surface of the first component bonded to the second component and a surface of the second component bonded to the first component both have a roughness ra<1 nm.

22. The composite component according to claim 1, wherein the composite component is transparent and has an RIT >70%, spot frequencies <3%, and haze <5%.

23. The composite component according to claim 1, wherein the composite component is transparent and has an RIT >75%, spot frequencies <1%, and haze <2%.

24. A composite component created by bonding of first and second components, wherein the first component is a transparent technical ceramic having a surface bonded to the second component, the surface of the first component bonded to the second component having an evenness of <10 m and a roughness r.sub.a<20 nm, and the second component comprises a glass, wherein the first and second components are bonded without using a bonding material at a temperature between room temperature and a temperature below a melting/softening temperature of the first component and below a melting/softening temperature of the second component.

25. The composite component according to claim 1, wherein the second component is a glass which is pretensioned by pressure in a layer near a surface or a hardened glass.

Description

EXAMPLE 1

(1) Two square spinel tiles with polished (r.sub.a<20 nm, preferably r.sub.a<10 nm and more preferably r.sub.a<4 nm) surface are pretreated with chemical agents and plasma cleaning. In a clean room environment, the surfaces are brought into contact at room temperature, aligned, and tempered in a hot isostatic press using isostatic pressure of >500 bar, preferably >1000 bar and more preferably >1500 bar. The necessary temperatures are >1200 C., preferably >1350 C., and more preferably >1500 C. After the heat treatment, an integral bond has formed by diffusion processes which makes possible the transparent composite components with RIT values >75%.

EXAMPLE 2

(2) An alkali aluminum silicate glass which can be pretensioned with pressure in the layer near the surface is wrung with a transparent spinel ceramic. The dimensions of the square samples are 10 mm10 mm. The glass has a thickness of 1 mm, and the ceramic thickness is 500 m. The evenness is <5 m, and the roughness is less than 1 nm. Chamfered edges of both joining surfaces allow a precise alignment before the heat treatment. The joining surfaces are pre-cleaned. The spinel ceramic is provided with a thin SiO.sub.2 layer which is made hydrophilic by a treatment with chemical agents such as nitric acid and an aqueous NH.sub.4OH:H.sub.2O.sub.2 solution at elevated temperatures >80 C. After alignment of the samples, the temperature treatment is performed in a high vacuum oven at temperatures between 200 and 400 C. After the heat treatment, an integral bond has formed which makes possible the transparent composite components with RIT values >75%.

EXAMPLE 3

(3) An alkali aluminum silicate glass, which can be pretensioned with pressure in the layer near the surface, is wrung with a transparent spinel ceramic. The dimensions of the square samples are 10 mm10 mm. The glass has a thickness of 1 mm, and the ceramic thickness is about 200 m. The evenness is <500 nm, and the roughness is less than 1 nm. Chamfered edges of both joining surfaces allow a precise alignment before the heat treatment. The joining surfaces are plasma cleaned, uncoated and hydrophilic. After alignment of the samples, the heat treatment is performed in a high-vacuum oven at temperatures between 200 and 400 C. After the heat treatment, an integral bond has formed which makes possible the transparent composite components with RIT values >75%.