Glass article
To provide a glass article suitable for a top plate for a cooker, in which a color tone of a colored layer is not impaired. A glass article is characterized by including a Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet having lightness L* of 70 or greater, chromaticity a* of within ±5, and chromaticity b* of within ±5 at a thickness of 3 mm, and a colored layer formed on a back surface of the glass sheet.
1 . A glass article comprising:
a Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet having lightness L* of 70 or greater, chromaticity a* of within ±5, and chromaticity b* of within ±5 at a thickness of 3 mm; and
a colored layer formed on a back surface of the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet; wherein
the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet includes, in mass %, TiO 2 from 0 to less than 2% and ZrO 2 from 2.1 to 20%, and
the mass ratio of (Li 2 O+Na 2 O+K 2 O)/ZrO 2 is 1.98 or less.
2 . The glass article according to claim 1 , wherein the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet includes, in mass %, SiO 2 from 40 to 90%, Al 2 O 3 from 5 to 30%, Li 2 O from 1 to 10%, SnO 2 from 0 to 20%, MgO from 0 to 10%, P 2 O 5 from 0 to 10%, and Sb 2 O 3 +As 2 O 3 from 0 to less than 2%.
3 . The glass article according to claim 1 , wherein appearance of the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet is colorless and transparent.
4 . The glass article according to claim 1 , wherein the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet has a transmittance of 10% or greater at a thickness of 3 mm and a wavelength of 300 nm.
5 . The glass article according to claim 1 , wherein the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet has a thermal expansion coefficient of 30×10 −7 /° C. or less at 30 to 380° C.
6 . The glass article according to claim 1 , wherein the Li 2 O—Al 2 O 3 —SiO 2 -based crystallized glass sheet has a thermal expansion coefficient of 30×10 −7 /° C. or less at 30 to 750° C.
7 . A top plate for a cooker comprising the glass article according to claim 1 .