Glass-ceramics with high elastic modulus and hardness
A composition includes 30 mol % to 60 mol % SiO 2 ; 15 mol % to 40 mol % Al 2 O 3 ; 5 mol % to 25 mol % Y 2 O 3 ; 5 mol % to 15 mol % TiO 2 ; and 0.1 mol % to 15 mol % RO, such that RO is a sum of MgO, CaO, SrO, and BaO.
1. A composition, comprising:
30 mol % to 60 mol % SiO 2 ;
15 mol % to 40 mol % Al 2 O 3 ;
5 mol % to 25 mol % Y 2 O 3 ;
5 mol % to 15 mol % TiO 2 ;
0.1 mol % to 6 mol % R 2 O; and
0.1 mol % to 15 mol % RO,
wherein RO is a sum of MgO, CaO, SrO, and BaO, and
wherein R 2 O is a sum of Na 2 O, K 2 O, Li 2 O, Rb 2 O, and Cs 2 O.
2. The composition of claim 1 , comprising at least 4 mol % RO.
3. The composition of claim 1 , wherein RO comprises:
0 mol % to 10 mol % MgO, or
0 mol % to 10 mol % CaO, or
0 mol % to 10 mol % SrO, or
0 mol % to 10 mol % BaO.
4. The composition of claim 1 , wherein the composition comprises non-zero amounts of two or more of MgO, CaO, SrO, and BaO.
5. The composition of claim 1 , wherein the composition comprises non-zero amounts of three or more of MgO, CaO, SrO, and BaO.
6. The composition of claim 1 , further comprising 0 mol % to 10 mol % B 2 O 3 .
7. The composition of claim 1 , wherein the composition comprises a non-zero amount of Li 2 O, Na 2 O, or a combination thereof.
8. The composition of claim 1 , wherein R 2 O comprises 0 mol % to 5 mol % Li 2 O.
9. The composition of claim 1 , wherein R 2 O comprises 0.1 mol % to 5 mol % Na 2 O.
10. The composition of claim 1 , wherein the composition is a glass composition.
11. The composition of claim 1 , wherein the composition is a glass-ceramic composition.
12. The composition of claim 11 , wherein the glass-ceramic composition comprises at least one of Y 2 Ti 2 O 7 , Y 2 Si 2 O 7 , or a combination thereof.
13. The composition of claim 11 , wherein the glass-ceramic composition comprises at least one Mg-based compound.
14. The composition of claim 13 , wherein the at least one Mg-based compound comprises Mg 2 Al 4 Si 5 O 18 , Mg 2 SiO 4 , Mg 4 Al 8 Si 2 O 20 , MgAl 2 Si 3 O 10 , or a combination thereof.
15. The composition of claim 11 , wherein the glass-ceramic composition further comprises at least one compound selected from the group consisting of Y 3 Al 5 O 12 , LiAlSi 2 O 6 , Al 6 Si 2 O 13 , SrAl 2 Si 2 O 8 , and BaAl 2 Si 2 O 8 .
16. The composition of claim 1 , wherein a ratio of RO to Al 2 O 3 is in a range of 0.01 to 0.5.
17. The composition of claim 10 , wherein the composition comprises a Young's modulus in a range of 117 GPa to 136 GPa.
18. The composition of claim 13 , wherein the composition comprises a Young's modulus in a range of 150 GPa to 196 GPa.
19. A composition, comprising:
30 mol % to 60 mol % SiO 2 ;
15 mol % to 40 mol % Al 2 O 3 ;
5 mol % to 25 mol % Y 2 O 3 ;
5 mol % to 15 mol % TiO 2 ; and
0.1 mol % to 15 mol % RO,
wherein RO is a sum of MgO, CaO, SrO, and BaO, and
further wherein the composition is a glass-ceramic composition.