High performance blue glass
View Patent ↗A glass composition for forming a blue colored glass is disclosed. The glass composition is made up of a base glass portion, iron oxide, and at least one first additive compound selected from Nd 2 O 3 in an amount up to 1 weight percent and/or CuO in an amount up to 0.5 weight percent. The base glass portion has the following components: SiO 2 from 66 to 75 weight percent; Na 2 O from 10 to 20 weight percent; CaO from 5 to 15 weight percent; MgO from 0 to 5 weight percent; Al 2 O 3 from 0 to 5 weight percent; B 2 O 3 from 0 to 5 weight percent; and K 2 O from 0 to 5 weight percent. The total iron in the glass composition ranges from 0.3 to 1.2 weight percent, and the glass composition has a redox ratio ranging from 0.15 to 0.65.
1. A float glass composition for forming a blue colored glass, comprising:
a base glass portion comprising:
a. SiO 2 from 66 to 75 weight percent;
b. Na 2 O from 10 to 20 weight percent;
c. CaO from 5 to 15 weight percent;
d. MgO from 0 to 5 weight percent; e. Al 2 O 3 from 0 to 5 weight percent;
f. B 2 O 3 from 0 to 5 weight percent; and
g. K 2 O from 0 to 5 weight percent; and
additives consisting essentially of:
total iron from 0.3 to 1.2 weight percent;
a first additive compound comprising Nd 2 O 3 in an amount up to 1 weight percent;
CuO in an amount up to 0.3 weight percent based on the total weight of the glass composition; and
optionally one or more second additive compounds selected from CoO, Cr 2 O 3 , V 2 O 5 , CeO 2 , H 2 O, SO 3 , TiO 2 , ZnO, MoO 3 , NiO, La 2 O 0.3 , WO 3 , Er 2 O 3 , SnO 2 , and MnO 2 ,
wherein the redox ratio of the composition ranges from 0.35 to 0.40 and the glass has a blue color characterized by a dominant wavelength in the range of 480 nm to 495 nm and an excitation purity no greater than 18 percent and an Lta of at least 70% at a thickness of 0.154 inches.
2. The glass composition of claim 1 , wherein the total iron ranges from 0.4 to 0.8 weight percent.
3. The glass composition of claim 1 , wherein the glass has an ISO Tuv no greater than 45%, an SAE Tuv no greater than 60%, an SAE Tsol no greater than 60%, and a TSIR no greater than 45% at a thickness of 0.154 inches.
4. The glass composition of claim 1 , wherein the glass has a blue color characterized by a dominant wavelength up to 495 nm and an excitation purity up to 15 percent at a thickness of 0.154 inches.
5. The glass composition of claim 3 , wherein the glass has an ISO Tuv no greater than 43% at a thickness of 0.154 inches.
6. The glass composition of claim 3 , wherein the glass has an SAE Tuv no greater than 58% at a thickness of 0.154 inches.
7. The glass composition of claim 3 , wherein the glass has an SAE Tsol no greater than 57% at a thickness of 0.154 inches.
8. The glass composition of claim 3 , wherein the glass has a TSIR no greater than 35% at a thickness of 0.154 inches.
9. The glass composition of claim 1 , wherein CoO is present as a second additive compound in an amount up to 40 PPM.
10. The glass composition of claim 1 , wherein Cr 2 O 3 is present as a second additive compound in an amount up to 100 PPM.
11. The glass composition of claim 1 , wherein CeO 2 is present as a second additive compound in an amount up to 3.0 weight percent based on the total weight of the glass composition.
12. A float glass composition for blue glass, comprising: a base glass portion comprising:
a. SiO 2 from 66 to 75 weight percent;
b. Na 2 O from 10 to 20 weight percent;
c. CaO from 5 to 15 weight percent;
d. MgO from 0 to 5 weight percent; e. Al 2 O 3 from 0 to 5 weight percent;
f. B 2 O 3 from 0 to 5 weight percent; and
g. K 2 O from 0 to 5 weight percent;and
additives consisting essentially of:
total iron from 0.3 to 1.2 weight percent;
a first additive compound comprising Nd 2 O 3 in an amount up to 1 weight percent;
CuO in an amount up to 0.3 weight percent based on the total weight of the glass composition; and
optionally one or more second additive compounds selected from CoO, Cr 2 O 3 , V 2 O 5 , CeO 2 , H 2 O, SO 3 , TiO 2 , ZnO, MoO 3 , NiO, La 2 O 0.3 , WO 3 , Er 2 O 3 , SnO 2 , and MnO 2 ,
wherein the redox ratio of the composition ranges from 0.35 to 0.40, and wherein the glass composition at a thickness of 0.154 inches has a blue color with an LTA of at least 70%, an ISO Tuv no greater than 45%, an SAE Tuv no greater than 60%, an SAE Tsol no greater than 60%, and TSIR no greater than 45.
13. A method for making blue colored glass in a float process, the method comprising providing a glass composition according to claim 1 ; melting the glass composition; and processing the glass composition in a float glass process to form blue colored glass.