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A glass composition includes about 60 mol. % to about 80 mol. % SiO 2 , 0 mol. % to about 11 mol. % Al 2 O 3 , about 4.0 mol. % to about 12 mol. % B 2 O 3 , about 0.5 mol. % to about 20 mol. % of K 2 O, 0 mol. % to about 18.5 mol. % MgO, and 0 mol. % to about 1 mol. % SnO 2 . The glass composition has a range of CTE, which can be adjusted based on the composition, and can be used for display applications.
1 . A glass composition consisting essentially of:
about 60 mol. % to about 80 mol. % SiO 2 ;
2 mol. % to about 11 mol. % Al 2 O 3 ;
about 4.0 mol. % to about 12 mol. % B 2 O 3 ;
about 0.5 mol. % to about 10 mol. % K 2 O;
0 mol. % to about 18.5 mol. % MgO; and
0 mol. % to about 1 mol. % SnO 2 ,
wherein a molar ratio of SiO 2 /B 2 O 3 is in a range of about 6 to about 15.
2 . The glass composition of claim 1 , wherein Al 2 O 3 has a content in a range of from about 4 mol. % to about 10.5 mol. %.
3 . The glass composition of claim 1 , wherein K 2 O has a content in a range of from about 3 mol. % to 10 mol. %.
4 . The glass composition of claim 1 , wherein SiO 2 has a content in a range of from about 65 mol. % to 75 about mol. %.
5 . The glass composition of claim 1 , wherein MgO has a content in a range of from about 10 mol. % to about 18.5 mol. %.
6 . The glass composition of claim 1 , wherein B 2 O 3 has a content in a range of from about 8 mol. % to about 11 mol. %.
7 . The glass composition of claim 1 , wherein SnO 2 has a content in a range of from about 0.05 mol. % to about 0.15 mol. %.
8 . The glass composition of claim 1 , wherein a molar ratio of K 2 O/Al 2 O 3 is in a range of from about 0.4 to about 360.
9 . The glass composition of claim 1 , wherein a molar ratio of MgO/Al 2 O 3 is in a range of 0 to about 10.
10 . The glass composition of claim 1 , wherein a molar ratio of MgO/Al 2 O 3 is in a range of 0 to about 4.
11 . The glass composition of claim 1 , wherein a R′ value defined as ([K 2 O]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.7 to about 0.7, and a R″ value defined as ([K 2 O]+0.5*[MgO]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.3 to about 1.3, wherein [K 2 O], [MgO], [Al 2 O 3 ], and [B 2 O 3 ] each respectively represent a molar content of K 2 O, MgO, Al 2 O 3 , and B 2 O 3 .
12 . The glass composition of claim 1 , wherein the glass composition has a coefficient of thermal expansion in a range of from about 40×10 −7 /° C. to about 85×10 −7 /° C. at a temperature from 20° C. to 300° C.
13 . A glass composition consisting essentially of:
about 60 mol. % to about 75 mol. % SiO 2 ;
about 4 mol. % to about 10.5 mol. % Al 2 O 3 ;
about 5 mol. % to about 11 mol. % B 2 O 3 ;
about 3.5 mol. % to about 10 mol. % K 2 O;
0 mol. % to about 6 mol. % MgO; and
0 mol. % to about 1 mol. % SnO 2 ,
wherein a molar ratio of K 2 O/Al 2 O 3 is in a range of from about 0.4 to about 2, and a molar ratio of MgO/Al 2 O 3 is in a range of 0 to about 4.
14 . The glass composition of claim 13 , wherein a molar ratio of SiO 2 /B 2 O 3 is in a range of about 6 to about 15.
15 . The glass composition of claim 13 , wherein a R′ value defined as ([K 2 O]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.7 to about 0.7, and a R″ value defined as ([K 2 O]+0.5*[MgO]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.3 to about 1.3, wherein [K 2 O], [MgO], [Al 2 O 3 ], and [B 2 O 3 ] each respectively represent a molar content of K 2 O, MgO, Al 2 O 3 , and B 2 O 3 .
16 . A glass article comprising the glass composition of claim 1 .
17 . A display device comprising the glass composition of claim 1 or a glass substrate comprising the glass composition of claim 1 .
18 . The display device of claim 17 , wherein the glass composition or the glass substrate is a cover or backplane in an electronic device for display application.
19 . A display device comprising the glass composition of claim 13 or a glass article comprising the glass composition of claim 13 .
20 . A glass composition consisting essentially of:
about 60 mol. % to about 80 mol. % SiO 2 ;
2 mol. % to about 11 mol. % Al 2 O 3 ;
about 4.0 mol. % to about 12 mol. % B 2 O 3 ;
about 0.5 mol. % to about 10 mol. % K 2 O;
0 mol. % to about 18.5 mol. % MgO; and
0 mol. % to about 1 mol. % SnO 2 ,
wherein a R′ value defined as ([K 2 O]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.7 to about 0.7, and a R″ value defined as ([K 2 O]+0.5*[MgO]—[Al 2 O 3 ])/[B 2 O 3 ] is in a range of from about −0.3 to about 1.3, wherein [K 2 O], [MgO], [Al 2 O 3 ], and [B 2 O 3 ] each respectively represent a molar content of K 2 O, MgO, Al 2 O 3 , and B 2 O 3 .