Silicate glass and dental product
The present invention provides a silicate glass that can reduce a color change in base material zirconia even when simultaneously fired with an unsintered zirconia. The present invention also provides a dental product using same. The present invention relates to a silicate glass comprising: 65.0 to 90.0 mol % SiO 2 , 4.0 to 15.0 mol % Al 2 O 3 , 1.0 to 10.0 mol % K 2 O, 0.1 to 7.0 mol % Na 2 O, and 0.01 to 15.0 mol % CaO, the silicate glass being essentially free of B 2 O 3 , and satisfying the relation {(number of moles of Al 2 O 3 )/(total number of moles of RO+R 2 O)}≥0.70, wherein R in the metal oxide represented by RO represents a metallic element in group 2 or 12 of the periodic table, and R in the metal oxide represented by R 2 O represents a metallic element in group 1 of the periodic table. The present invention also relates to a composite comprising the silicate glass and a base material formed of a ceramic; a sintered body as a fired product of the composite; and a dental product comprising the sintered body.
1. A silicate glass comprising:
65.0 to 90.0 mol % SiO 2 ,
4.0 to 15.0 mol % Al 2 O 3 ,
1.0 to 10.0 mol % K 2 O,
0.1 to 7.0 mol % Na 2 O, and
0.01 to 15.0 mol % CaO,
the silicate glass being essentially free of B 2 O 3 ,
the content of Li 2 O being less than 0.1 mol %,
the content of an oxide of Tb being 0 mol %,
satisfying the relation {(number of moles of Al 2 O 3 )/(total number of moles of RO+R 2 O)}≅0.70, wherein R in the metal oxide represented by RO represents a metallic element in group 2 or 12 of the periodic table, and R in the metal oxide represented by R 2 O represents a metallic element in group 1 of the periodic table.
2. The silicate glass according to claim 1 , comprising:
69.0 to 89.0 mol % SiO 2 ,
5.0 to 13.0 mol % Al 2 O 3 ,
3.0 to 9.0 mol % K 2 O,
1.0 to 4.0 mol % Na 2 O, and
0.05 to 13.0 mol % CaO,
the silicate glass being essentially free of B 2 O 3 , and satisfying the relation {(number of moles of Al 2 O 3 )/(total number of moles of RO+R 2 O)}≥0.70.
3. The silicate glass according to claim 1 ,
wherein the silicate glass is essentially free of ZnO.
4. The silicate glass according to claim 1 ,
wherein the silicate glass is essentially free of MgO, BaO, and SrO.
5. The silicate glass according to claim 1 ,
wherein the silicate glass has a suitable firing temperature of 1,100° C. or more.
6. The silicate glass according to claim 1 ,
wherein the silicate glass has a coefficient of thermal expansion of 11.0×10 −6 K −1 or less as measured in compliance with ISO 6872:2015.
7. The silicate glass according to claim 1 ,
wherein the silicate glass further comprises at least one selected from the group consisting of a pigment and an opacifying agent.
8. A composite comprising the silicate glass of claim 1 , and a ceramic.
9. The composite according to claim 8 , wherein the ceramic is a zirconia ceramic.
10. A sintered body of the composite of claim 8 .
11. A dental product comprising the sintered body of claim 10 .