CRYSTALLIZED GLASS OF THREE-DIMENSIONAL SHAPE, CHEMICALLY STRENGTHENED GLASS OF THREE-DIMENSIONAL SHAPE, AND METHOD FOR PRODUCING CRYSTALLIZED GLASS OF THREE-DIMENSIONAL SHAPE AND CHEMICALLY STRENGTHENED GLASS OF THREE-DIMENSIONAL SHAPE
The present invention provides crystallized glass of three-dimensional shape for easily producing chemically strengthened glass of three-dimensional shape that resists damage and has exceptional transparency. This crystallized glass of three-dimensional shape: contains crystals; has light transmittance in terms of a thickness of 0.8 mm of 80% or higher; and contains 45-74% SiO 2 , 1-30% Al 2 O 3 , 1-25% Li 2 O, 0-10% Na 2 O, 0-5% K 2 O, a total of 0-15% of SnO 2 and/or ZrO 2 , and 0-12% P 2 O 5 , these amounts expressing the oxide-based mass percentage.
1 . A three-dimensionally shaped crystallized glass comprising a crystal, the glass having a light transmittance of 80% or more in terms of a thickness of 0.8 mm and comprising, in mass % on an oxide basis:
from 45 to 74% of SiO 2 ;
from 1 to 30% of Al 2 O 3 ;
from 1 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 12% of P 2 O 5 .
2 . The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis:
from 58 to 74% of SiO 2 ;
from 5 to 30% of Al 2 O 3 ;
from 1 to 14% of Li 2 O;
from 0 to 5% of Na 2 O;
from 0 to 2% of K 2 O;
from 0.5 to 12% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 6% of P 2 O 5 .
3 . The three-dimensionally shaped crystallized glass according to claim 2 , comprising, in mass % on an oxide basis:
from 58 to 70% of SiO 2 ;
from 15 to 30% of Al 2 O 3 ;
from 2 to 10% of Li 2 O;
from 0 to 5% of Na 2 O;
from 0 to 2% of K 2 O;
from 0.5 to 6% of SnO 2 ;
from 0.5 to 6% of ZrO 2 ; and
from 0 to 6% of P 2 O 5 ,
in which Na 2 O+K 2 O is from 1 to 5%.
4 . The three-dimensionally shaped crystallized glass according to claim 1 , comprising, in mass % on an oxide basis:
from 45 to 70% of SiO 2 ;
from 1 to 20% of Al 2 O 3 ;
from 10 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% of ZrO 2 ; and
from 0 to 12% of P 2 O 5 .
5 . The three-dimensionally shaped crystallized glass according to claim 1 , comprising a β-spodumene crystal.
6 . The three-dimensionally shaped crystallized glass according to claim 1 , comprising a petalite crystal.
7 . The three-dimensionally shaped crystallized glass according to claim 1 , comprising a lithium metasilicate crystal.
8 . The three-dimensionally shaped crystallized glass according to claim 1 , having a Vickers hardness of 780 or more.
9 . A three-dimensionally shaped chemically strengthened glass having a compressive stress layer on a surface thereof, the glass being a crystallized glass comprising a crystal, having a light transmittance of 80% or more in terms of a thickness of 0.8 mm and comprising, in mass % on an oxide basis:
from 45 to 74% of SiO 2 ;
from 1 to 30% of Al 2 O 3 ;
from 1 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 12% of P 2 O 5 .
10 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , comprising, in mass % on an oxide basis:
from 58 to 74% of SiO 2 ;
from 5 to 30% of Al 2 O 3 ;
from 1 to 14% of Li 2 O;
from 0 to 5% of Na 2 O;
from 0 to 2% of K 2 O;
from 0.5 to 12% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 6% of P 2 O 5 .
11 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , comprising, in mass % on an oxide basis:
from 45 to 70% of SiO 2 ;
from 1 to 20% of Al 2 O 3 ;
from 10 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% of ZrO 2 ; and
from 0 to 12% of P 2 O 5 .
12 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , comprising a β-spodumene crystal.
13 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , comprising a lithium metasilicate crystal.
14 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , having a Vickers hardness of 800 or more.
15 . The three-dimensionally shaped chemically strengthened glass according to claim 9 , having a surface compressive stress of 600 MPa or more and a depth of the compressive stress layer of 80 μm or more.
16 . A production method of a glass for chemical strengthening, the method comprising: heating and crystallizing a glass comprising, in mass % on an oxide basis:
from 45 to 74% of SiO 2 ;
from 1 to 30% of Al 2 O 3 ;
from 1 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 12% of P 2 O 5 ; and
bend-forming a resulting crystallized glass under heating.
17 . The production method of a glass for chemical strengthening according to claim 16 , wherein the glass comprises, in mass % on an oxide basis:
from 58 to 74% of SiO 2 ;
from 5 to 30% of Al 2 O 3 ;
from 1 to 14% of Li 2 O;
from 0 to 5% of Na 2 O;
from 0 to 2% of K 2 O;
from 0.5 to 12% in total of either one or more of SnO 2 and ZrO 2 ; and
from 0 to 6% of P 2 O 5 ,
in which Na 2 O+K 2 O is from 1 to 5%.
18 . The production method of a glass for chemical strengthening according to claim 16 , wherein the glass comprises, in mass % on an oxide basis:
from 45 to 70% of SiO 2 ;
from 1 to 20% of Al 2 O 3 ;
from 10 to 25% of Li 2 O;
from 0 to 10% of Na 2 O;
from 0 to 5% of K 2 O;
from 0 to 15% of ZrO 2 ; and
from 0 to 12% of P 2 O 5 .
19 . A production method of a chemically strengthened glass, the method comprising chemically strengthening a glass for chemical strengthening obtained by the method according to claim 16 .