Transparent combeite glass-ceramics
A silicate-based composition includes, in mol. %: 35-65% SiO 2 , 20-40% CaO, 10-30% Na 2 O, 0-15% TiO 2 , >0-15% Al 2 O 3 , 0-10% P 2 O 5 , 0-15% ZrO 2 , and 0-3% SnO 2 . A method of forming a silicate-based composition includes ceramming a silicate-based composition such that the ceramming is a cycle has a first portion and a second portion, with the first portion conducted at a first temperature for a first time and the second portion conducted at a second temperature for a second time.
1 . A cerammed silicate-based composition, comprising, in mol. %:
35-65% SiO 2 ,
20-40% CaO,
10-30% Na 2 O,
>0-15% TiO 2 ,
>0-15% Al 2 O 3 ,
0-10% P 2 O5,
0-15% ZrO 2 , and
0-3% SnO 2 ,
wherein the cerammed silicate-based composition has at least one of:
fracture toughness ranging from 0.9-2.5 MPa·m 0.5 ,
Young's modulus ranging from 90-200 GPa, or
transparency exceeding 70%.
2 . The composition of claim 1 , wherein the composition comprises, in mol. %:
40-55% SiO 2 ,
25-40% CaO,
10-25% Na 2 O, and
0.5-15% Al 2 O 3 .
3 . The composition of claim 1 , wherein the composition comprises, in mol. %: 0.5-10% Al 2 O3.
4 . The composition of claim 1 , wherein the composition comprises, in mol. %: >0-10% TiO 2 .
5 . The composition of claim 1 , wherein the composition comprises, in mol. %: >0-10% ZrO 2 .
6 . The composition of claim 1 , wherein the composition comprises, in mol. %: >0-5% P 2 O 5 .
7 . The composition of claim 1 , wherein the composition comprises, in mol. %: >0-3% SnO 2 .
8 . The composition of claim 1 , wherein a totality of other oxides is, in mol. %, less than 1%.
9 . The composition of claim 1 , wherein the cerammed silicate-based composition comprises a major combeite crystallite phase.
10 . The composition of claim 9 , wherein the major combeite crystallite phase has a crystal size in a range of 100-300 μm.
11 . The composition of claim 1 , wherein the cerammed silicate-based composition comprises at least one minor phase including carnegieite, albite, nepheline, or combinations thereof.
12 . A method of forming the cerammed silicate-based composition of claim 1 , the method comprising:
ceramming a silicate-based composition comprising:
35-65% SiO 2 ,
20-40% CaO,
10-30% Na 2 O,
>0-15% TiO 2 ,
>0-15% Al 2 O 3 ,
0-10% P 2 O 5 ,
0-15% ZrO 2 , and
0-3% SnO 2
wherein the ceramming is a cycle comprising a first portion and a second portion, and
wherein the first portion is conducted at a first temperature for a first time and the second portion is conducted at a second temperature for a second time,
thereby forming the cerammed silicate-based composition.
13 . The method of claim 12 , wherein the first portion is conducted at a first temperature in a range of 500-1200° C. for a first time in a range of 12-36 hrs.
14 . The method of claim 12 , wherein the second portion is conducted at a second temperature in a range of 500-1200° C. for a second time in a range of 30 sec-1 hr.
15 . The method of claim 12 , wherein the cerammed silicate-based composition comprises a major combeite crystallite phase.
16 . The method of claim 15 , wherein the major combeite crystallite phase has a crystal size in a range of 100-300 μm.
17 . The composition of claim 1 , wherein the cerammed silicate-based composition comprises at least one minor phase including carnegieite, albite, or a combination thereof.
18 . A cerammed silicate-based composition, comprising, in mol. %:
35-65% SiO 2 ,
20-40% CaO,
10-30% Na 2 O,
>0-15% TiO 2 ,
>0-15% Al 2 O 3 ,
0-10% P 2 O 5 ,
0-15% ZrO 2 , and
0-3% SnO 2 ,
wherein the cerammed silicate-based composition comprises a major combeite crystallite phase.
19 . The composition of claim 18 , wherein the composition comprises, in mol. %:
40-55% SiO 2 ,
25-40% CaO,
10-25% Na 2 O, and
0.5-15% Al 2 O 3 .
20 . The composition of claim 18 , wherein the composition comprises, in mol. %, at least one of:
0.5-10% Al 2 O3,
>0-10% TiO 2 ,
>0-10% ZrO, and
>0-5% P 2 O 5 .
21 . The composition of claim 18 , wherein the major combeite crystallite phase has a crystal size in a range of 100-300 μm.
22 . The composition of claim 18 , wherein the cerammed silicate-based composition comprises at least one minor phase including carnegieite, albite, nepheline, or combinations thereof.
23 . A cerammed silicate-based composition, comprising, in mol. %:
35-65% SiO 2 ,
20-40% CaO,
10-30% Na 2 O,
>0-15% TiO 2 ,
>0-15% Al 2 O 3 ,
0-10% P 2 O 5 ,
0-15% ZrO 2 , and
0-3% SnO 2 ,
wherein the cerammed silicate-based composition comprises at least one minor phase including carnegieite, albite, nepheline, or combinations thereof.
24 . The composition of claim 23 , wherein the composition comprises, in mol. %:
40-55% SiO 2 ,
25-40% CaO,
10-25% Na 2 O, and
0.5-15% Al 2 O 3 .
25 . The composition of claim 23 , wherein the composition comprises, in mol. %, at least one of:
0.5-10% Al 2 O 3 ,
>0-10% TiO 2 ,
>0-10% ZrO, and
>0-5% P 2 O 5 .
26 . The composition of claim 23 , wherein the cerammed silicate-based composition comprises at least one minor phase including carnegieite, albite, or combinations thereof.