Lithium silicate glass ceramic and glass with rubidium oxide content
The invention relates to the use of lithium silicate glass ceramics and glasses with rubidium oxide content for coating an oxide ceramic, a metal or an alloy.
1. Composite material which comprises a lithium silicate glass ceramic or a lithium silicate glass, which comprise the following components
Component
wt.-%
SiO 2
56.0 to 73.0
Li 2 O
13.0 to 19.0
Rb 2 O
3.0 to 9.0
A1 2 O 3
2.0 to 5.0
P 2 O 5
2.0 to 6.0
ZrO 2
0 to 4.5
on a substrate selected from oxide ceramics, metals and alloys.
2. Composite material according to claim 1 , wherein the substrate is a dental restoration.
3. Process for coating a substrate selected from oxide ceramics, metals and alloys, in which a lithium silicate glass ceramic or a lithium silicate glass which comprise the following components
Component
wt.-%
SiO 2
56.0 to 73.0
Li 2 O
13.0 to 19.0
Rb 2 O
3.0 to 9.0
A1 2 O 3
2.0 to 5.0
P 2 O 5
2.0 to 6.0
ZrO 2
0 to 4.5
is applied to the substrate.
4. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise at least one of the following components in the given amounts
Component
wt.-%
SiO 2
56.9 to 72.0
Li 2 O
14.2 to 18.0
Rb 2 O
3.7 to 7.7
Al 2 O 3
2.5 to 4.5
P 2 O 5
3.1 to 5.0
ZrO 2
0 to 4.0
Transition
0 to 7.5,
metal oxide
wherein the transition metal oxide is selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.
5. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 58.0 to 72.0 wt.-% SiO 2 .
6. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 3.7 to 7.7 wt.-% Rb 2 O.
7. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 2.5 to 4.0 wt.-% Al 2 O 3 .
8. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% Cs 2 O.
9. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 4.0 wt.-% Na 2 O and/or K 2 O.
10. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.8 wt.-% BaO.
11. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase and has a bending strength in the range of about 180 to 300 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .
12. Process according to claim 11 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .
13. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase and has a bending strength in the range of about 400 to 700 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .
14. Process according to claim 13 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .
15. Process according to claim 3 , in which a lithium silicate glass is used.
16. Process according to claim 15 , wherein the lithium silicate glass comprises nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.
17. Process according to claim 3 , in which the substrate is an oxide ceramic.
18. Process according to claim 17 , in which the substrate comprises a zirconium oxide ceramic.
19. Process according to claim 3 , in which the substrate is a metal or an alloy.
20. Process according to claim 19 , wherein the alloy comprises a non-precious metal alloy.
21. Process according to claim 3 , in which the substrate is a dental restoration.
22. Process according to claim 21 , wherein the dental restoration comprises a bridge, an inlay, an onlay, a veneer, an abutment, a partial crown, a crown or a facet.
23. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass is applied to the substrate by sintering.
24. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass is applied to the substrate by joining.
25. Process according to claim 24 , in which the lithium silicate glass ceramic or the lithium silicate glass is shaped to a desired geometry by machining or by hot pressing before joining.
26. Process according to claim 3 , in which a coating is obtained which comprises a lithium silicate glass ceramic that comprises lithium disilicate as main crystal phase, and which has a bending strength in the range of about 400 to 700 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .
27. Process according to claim 26 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .
28. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise at least one of the following components in the given amounts
Component
wt.-%
SiO 2
56.9 to 72.0
Li 2 O
14.2 to 18.0
Rb 2 O
3.7 to 7.7
Al 2 O 3
2.5 to 4.5
P 2 O 5
3.1 to 5.0
ZrO 2
0 to 4.0
Transition
0 to 7.0.
metal oxide
29. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 60.0 to 71.0 wt.-% SiO 2 .
30. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 3.0 to 3.5 wt.-% Al 2 O 3 .
31. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 1.5 wt.-% Cs 2 O.
32. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass is substantially free of Cs 2 O.
33. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.5 wt.-% Na 2 O and/or K 2 O.
34. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.0 wt.-% Na 2 O and/or K 2 O.
35. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% BaO.
36. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass is substantially free of BaO.
37. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass is applied to the substrate by pressing-on.
38. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase.
39. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase.
40. Process according to claim 3 , in which a coating is obtained which comprises a lithium silicate glass ceramic that comprises lithium metasilicate as main crystal phase.
41. Process according to claim 3 , in which a coating is obtained which comprises a lithium silicate glass ceramic that comprises lithium disilicate as main crystal phase.
42. Process for coating a substrate selected from oxide ceramics, metals and alloys, in which a lithium silicate glass ceramic or a lithium silicate glass which comprise the following components
Component
wt.-%
SiO 2
56.0 to 73.0
Li 2 O
13.0 to 19.0
Rb 2 O
3.0 to 9.0
Al 2 O 3
2.0 to 5.0
P 2 O 5
2.0 to 6.0
is applied to the substrate and in which a coating is obtained which comprises a lithium silicate glass ceramic that comprises lithium metasilicate as main crystal phase, and which has a bending strength in the range of about 180 to 300 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .
43. Process according to claim 42 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .
44. Lithium silicate glass ceramic, which comprises the following components in the given amounts
Component
wt.-%
SiO 2
56.0 to 72.5
Li 2 O
13.0 to 19.0
Rb 2 O
3.0 to 9.0
Al 2 O 3
2.0 to 5.0
P 2 O 5
2.0 to 6.0
ZrO 2
0 to 4.5
Transition
0 to 7.5,
metal oxide
wherein the transition metal oxide is selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.
45. Lithium silicate glass, which comprises the components of the glass ceramic according to claim 44 .
46. Lithium silicate glass ceramic, which comprises the following components in the given amounts
Component
wt.-%
SiO 2
56.9 to 72.0
Li 2 O
14.2 to 18.0
Rb 2 O
3.7 to 7.7
Al 2 O 3
2.5 to 4.5
P 2 O 5
3.1 to 5.0
ZrO 2
0 to 4.0
Transition
0 to 7.0,
metal oxide
wherein the transition metal oxide is selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.