Glass
The present invention relates to a glass including, represented by mole percent based on oxides: from 52% to 80% of SiO 2 ; from 5% to 30% of B 2 O 3 ; from 2% to 30% of Al 2 O 3 ; from 0.1% to 11% of P 2 O 5 ; and from 0.0001% to 5% of Na 2 O, in which the glass has an average thermal expansion coefficient α at from 50° C. to 350° C. of from 5×10 −7 /° C. or more and less than 33×10 −7 /° C.
1 . A heat-resistant member, comprising:
a glass sheet comprising a glass, and
a ceramic having a thermal conductivity of 25 Wm/K or more and bonded to the glass sheet by fluororesin bonding,
wherein
the glass comprises:
a composition comprising, by mole percent based on oxides,
52% to 80% of SiO 2 ,
5% to 30% of B 2 O 3 ,
2% to 30% of Al 2 O 3 ,
0.1% to 11% of P 2 O 5 , and
0.0001% to 5% of Na 2 O, and
wherein the glass has an average thermal expansion coefficient α in a range of 5×10 −7 /° C. to less than 33×10 −7 /° C. at a temperature in a range of 50° C. to 350° C.
2 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes 0.00001% to 0.03% of Fe 2 O 3 .
3 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes 76.5% to 85% of SiO 2 +Al 2 O 3 and 0.01% to 5% of R 2 O provided that R 2 O is at least one of Li 2 O and K 2 O.
4 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes from 0.1% to 10% of MgO.
5 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes 55% to 68% of SiO 2 , and 8.5% to 30% of Al 2 O 3 , and a ratio of the content of P 2 O 5 to the content of Al 2 O 3 , P 2 O 5 /Al 2 O 3 , by mole percent based on oxides, is from 0.1 to 1.0.
6 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes 89% to 99% of SiO 2 +Al 2 O 3 +B 2 O 3 +P 2 O 5 , and satisfies (Al 2 O 3 +B 2 O 3 )/(SiO 2 +P 2 O 5 )≥0.3, which is a ratio of a sum of the contents of Al 2 O 3 and B 2 O 3 to SiO 2 +P 2 O 5 , by mole percent based on oxides.
7 . The heat-resistant member according to claim 1 , wherein the glass sheet has a sheet thickness in a range of 4 mm to 150 mm.
8 . The heat-resistant member according to claim 1 . wherein
the ceramic has a difference in expansion coefficient within a range of±6.0×10 −7 /° C. in a region of 50° C. to 200° C.
9 . The heat-resistant member according to claim 1 , wherein a linear transmittance T 850 of the glass is 90% or more when the glass has a glass sheet thickness of 15 mm.
10 . The heat-resistant member according to claim 1 , wherein the average thermal expansion coefficient α is in a range of 24×10 −7 /° C. to less than 33×10 −7 /° C. at a temperature in a range of 50° C. to 350° C.
11 . The heat-resistant member according to claim 2 , wherein a linear transmittance T 850 of the glass is 90% or more when the glass has a glass sheet thickness of 15 mm.
12 . The heat-resistant member according to claim 2 , wherein the average thermal expansion coefficient α is in a range of 24×10 −7 /° C. to less than 33×10 −7 /° C. at a temperature in a range of 50° C. to 350° C.
13 . The heat-resistant member according to claim 3 , wherein a linear transmittance T 850 of the glass is 90% or more when the glass bas a glass sheet thickness of 15 mm.
14 . The heat-resistant member according to claim 3 , wherein the average thermal expansion coefficient α is in a range of 24× 10 −7 /° C. to less than 33×10 −7 /° C. at a temperature in a range of 50° C. to 350° C.
15 . The heat-resistant member according to claim 2 , wherein the composition of the glass, by mole percent based on oxides, includes 76.5% to 85% of SiO 2 +Al 2 O 3 and 0.01% to 5% of R2O provided that R 2 O is at least one of Li 2 O and K 2 O.
16 . The heat-resistant member according to claim 2 , wherein the composition of the glass, by mole percent based on oxides, includes from 0.1% to 10% of MgO.
17 . The heat-resistant member according to claim 1 , wherein a linear transmittance T 850 of the glass is 87.5% or more when the glass has a glass sheet thickness of 15 mm.
18 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, includes 0.1% to 3% of CaO.
19 . The heat-resistant member according to claim 1 , wherein the composition of the glass, by mole percent based on oxides, satisfies (CaO+Na 2 O+P 2 O 5 )/Al 2 O 3 ≥ 0 . 35 .