Silicoborate and borosilicate glasses with high refractive index and low density

Patent metadata

Field	Value
Publication number	US-11802073-B2
Application number	US-202117398541-A
Country	US
Kind code	B2
Filing date	Aug 10, 2021
Priority date	Sep 10, 2020
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

Glasses containing silicon dioxide (SiO2) and/or boron oxide (B2O3) as glass formers and having a refractive index nd of greater than or equal to 1.9, as measured at 587.56 nm, and a density of less than or equal to 5.5 g/cm3, as measured at 25° C., are provided. Optionally, the glasses may be characterized by a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum and/or good glass forming ability.

First claim

What is claimed is:

1. A glass, comprising:
SiO 2 of from 14.0 mol % to 50.0 mol %;
B 2 O 3 at greater than 0.7 mol %;
TiO 2 from 5.0 mol % to 40.0 mol %;
Nb 2 O 5 from 2.2 mol % to 50.0 mol %;
ZrO 2 from 2.5 mol % to 25.0 mol %;
a total content of rare earth metal oxides (RE m O n ) of from 0.0 mol % to 30.0 mol %; and
a sum of SiO 2 , B 2 O 3 , TiO 2 , Nb 2 O 5 , ZrO 2 and RE m O n (SiO 2 +B 2 O 3 +TiO 2 +Nb 2 O 5 +ZrO 2 +RE m O n ) is greater than or equal to 99.5 mol %, and
wherein a ratio of an amount of B 2 O 3 to an amount of SiO 2 (B 2 O 3 /SiO 2 ), in mole percent of oxide, is at least 0.050, and
wherein the glass is substantially free of Y 2 O 3 .

2. The glass of claim 1 , wherein the glass comprises at least one of:
TiO 2 from 12.0 mol % to 40.0 mol %;
ZrO 2 from 2.5 mol % to 13.0 mol %; and
Nb 2 O 5 from 2.2 mol % to 30.0 mol %.

3. The glass of claim 1 , wherein at least one of the one or more rare earth metal oxides is selected from the group of La 2 O 3 , Gd 2 O 3 and Yb 2 O 3 .

4. The glass of claim 1 , wherein the glass has:
a refractive index n d of from 1.90 to 2.10, as measured at a wavelength of 587.56 nm; and
a density d RT of 5.5 g/cm 3 or less, as measured at 25° C.

5. The glass of claim 1 , wherein the glass satisfies at least one of formula (I) and formula (II), based on an amount of each oxide, in mole percent of oxides:
0.0≤(SiO 2 +Nb 2 O 5 +ZrO 2 −RE m O n )≤12.0  (I)

and

(

RE
m

⁢

O
n

-

ZrO
2

-

Nb
2

⁢

O
5

)

×

(

RE
m

⁢

O
n

-

ZrO
2

-

Nb
2

⁢

O
5

-

SiO
2

)

(

RE
m

⁢

O
n

+

ZrO
2

+

Nb
2

⁢

O
5

+

SiO
2

)

≤
0.

(
II
)

where RE m O n is the total content of rare earth metal oxides in terms of mole percent.

6. The glass of claim 1 , wherein the glass is characterized by an ability to cool, in air, from 1100° C. to 500° C. in 2.5 minutes without crystallizing.

7. A glass, comprising:
B 2 O 3 of from 1.0 mol % to 40.0 mol %;
La 2 O 3 at 13.5 mol % or greater;
SiO 2 at greater than or equal to 0.0 mol %, wherein a sum of (SiO 2 +B 2 O 3 ) is from 1.0 mol % to 50.0 mol %; and
at least one oxide selected from Al 2 O 3 , Nb 2 O 5 , TiO 2 , ThO 2 , GeO 2 , P 2 O 5 , ZnO, Y 2 O 3 , BaO, Bi 2 O 3 , CaO, Er 2 O 3 , Gd 2 O 3 , K 2 O, La 2 O 3 , Li 2 O, Na 2 O, Nd 2 O 3 , PbO, TeO 2 , WO 3 , Yb 2 O 3 , ZrO 2 , and other rare earth metal oxides, subject to the proviso that:
Nb 2 O 5 is from 0.0 mol % to 12.3 mol %;
TiO 2 is from 0.0 mol % to 33.0 mol %;
ThO 2 is from 0.0 mol % to 5.0 mol %;
GeO 2 is from 0.0 mol % to 10.0 mol %;
P 2 O 5 is from 0.0 mol % to 20.0 mol %;
Al 2 O 3 is from 0.0 mol % to 2.5 mol %, and
a sum of (ZnO+Y 2 O 3 ) is from 0.0 mol % to 2.5 mol %, and

wherein the glass satisfies formula (X):
P n −(0.815+0.25* P d )>0.000  (X)

where P n is a refractive index parameter of the glass and is calculated according to formula (VIII):
P n =1.817−0.0035654*Al 2 O 3 −0.0038101*B 2 O 3 +0.00081216*BaO+0.010373*Bi 2 O 3 +0.00013728*CaO+0.0073116*Er 2 O 3 +0.0055226*Gd 2 O 3 −0.003343*K 2 O+0.0060806*La 2 O 3 −0.0009011*Li 2 O−0.001967*Na 2 O+0.0093799*Nb 2 O 5 +0.0060396*Nd 2 O 3 −0.0061024*P 2 O 5 +0.0040356*PbO−0.0032812*SiO 2 +0.0030562*TeO 2 +0.0034148*TiO 2 +0.004267*WO 3 +0.0034424*Y 2 O 3 +0.0071109*Yb 2 O 3 +0.00096907*ZnO+0.0026412*ZrO 2   (VIII)

and
P d is a density parameter and is calculated according to formula (IX):
P d =4.17−0.018843*Al 2 O 3 −0.020477*B 2 O 3 +0.021988*BaO+0.074733*Bi 2 O 3 −0.0024274*CaO+0.100258*Er 2 O 3 +0.074270*Gd 2 O 3 −0.018568*K 2 O+0.060370*La 2 O 3 −0.0089006*Li 2 O−0.0090924*Na 2 O+0.0062468*Nb 2 O 5 +0.068993*Nd 2 O 3 −0.038868*P 2 O 5 +0.048530*PbO−0.018196*SiO 2 +0.013124*TeO 2 −0.005285*TiO 2 +0.044564*WO 3 +0.022887*Y 2 O 3 +0.097857*Yb 2 O 3 +0.0077032*ZnO+0.012501*ZrO 2   (IX)

and each oxide listed in formula (VIII) and formula (IX) refers to the amount of the oxide, expressed in m

Assignees

• Corning Inc

Inventors

• Luo Jian
• Ma Lina
• Priven Alexander I

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C3/068 Primary

  containing rare earths · CPC title

• C03C3/072

  containing boron · CPC title

• C03C3/155

  containing zirconium, titanium, tantalum or niobium · CPC title

• C03C4/0085

  for UV-transmitting glass · CPC title