A12O3 rich hard and crack resistant glasses and glass-ceramics
View Patent ↗Al 2 O 3 — rich compositions with desirable hardness and crack resistance for various functional applications. Also disclosed is a method of manufacturing the composition into various dimensions and shapes under a temperature much lower than in conventional methods.
1. A glass or glass ceramic composition comprising a lanthanide oxide, aluminum oxide, boron oxide, and an alkaline earth metal oxide selected from the group consisting of magnesium oxide, calcium oxide, and a combination thereof, wherein the aluminum oxide is present in an amount ranging from about 30 mol % to about 60 mol %.
2. The glass or glass ceramic composition of claim 1 , wherein the aluminum oxide is present in an amount ranging from about 30 mol % to about 45 mol %.
3. The glass or glass ceramic composition of claim 1 , comprising magnesium oxide ranging from about 8 mol % to about 12 mol %.
4. The glass or glass ceramic composition of claim 3 , further comprising calcium oxide ranging from about 40 mol % to about 50 mol %.
5. The glass or glass ceramic composition of claim 3 , wherein the oxide of the alkaline earth metal is present in an amount ranging from about 1 mol % to about 25 mol %.
6. The glass or glass ceramic composition of claim 1 , wherein the alkaline earth metal oxide is MgO ranging from about 2 mol % to about 25 mol %.
7. The glass or glass ceramic composition of claim 1 , wherein the lanthanide oxide is selected from the group consisting of lanthanum oxide and yttrium oxide.
8. The glass or glass ceramic composition of claim 1 , wherein the lanthanide oxide is present in an amount ranging from about 5 mol % to about 30 mol %.
9. The glass or glass ceramic composition of claim 1 , wherein the oxide of the lanthanide is La 2 O 3 ranging from about 5 mol % to about 25 mol %.
10. The glass or glass ceramic composition of claim 1 , wherein the oxide of the lanthanide is Y 2 O 3 ranging from about 5 mol % to about 20 mol %.
11. The glass or glass ceramic composition of claim 1 , wherein the boron oxide is present in an amount ranging from about 35 mol % to about 65 mol %.
12. The glass or glass ceramic composition of claim 1 , further comprising P 2 O 5 ranging from about 1 mol % to about 5 mol %.
13. The glass or glass ceramic composition of claim 1 , further comprising TiO 2 ranging from about 1 mol % to about 10 mol %.
14. The glass or glass ceramic composition of claim 1 , further comprising at least one of Nb 2 O 5 and Ta 2 O 5 , each independently ranging from about 1 mol % to about 10 mol %.
15. The glass or glass ceramic composition of claim 1 , wherein the respective amounts of lanthanide oxide, aluminum oxide, boron oxide, and alkaline earth metal oxide are selected so that the glass or glass ceramic composition has a density of less than about 3.5 g/cm 3 .
16. The glass or glass ceramic composition of claim 1 , wherein the respective amounts of lanthanide oxide aluminum oxide, boron oxide, and alkaline earth metal oxide are selected so that the glass or glass ceramic composition a density of ranging from about 2.0 to about 3.0 g/cm 3 .
17. The glass or glass ceramic composition of claim 1 , wherein the respective amounts of lanthanide oxide aluminum oxide, boron oxide, and alkaline earth metal oxide are selected so that the glass or glass ceramic composition has a Vickers hardness of more than about 7 GPa at about 200 g load.
18. The glass or glass ceramic composition of claim 1 , wherein the respective amounts of lanthanide oxide, aluminum oxide, boron oxide, and alkaline earth metal oxide are selected so that the glass or glass ceramic composition does not develop cracking until about more than 1000 gf load.
19. An article of manufacture comprising the glass or glass ceramic composition of claim 1 .
20. A method of manufacturing the glass or glass ceramic composition of claim 1 , comprising
(a) heating at a temperature ranging from about 1300 to about 1700° C. a mixture comprising a lanthanide oxide, aluminum oxide, boron oxide, and an alkaline earth metal oxide selected from the group consisting of magnesium oxide, calcium oxide, and a combination thereof to obtain a melt, wherein the aluminum oxide is present in an amount ranging from about 30 mol % to about 60 mol %; and
(b) quenching the melt in a desired shape and size.