Refractory product having a high content of zirconia

Patent metadata

Field	Value
Publication number	US-12559403-B2
Application number	US-202017429525-A
Country	US
Kind code	B2
Filing date	Feb 11, 2020
Priority date	Feb 11, 2019
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

Fused cast refractory product including, as weight percentages on the basis of the oxides and for a total of 100%: ZrO 2 : balance to 100%, Hf 2 O: <5%, SiO 2 : 8.1% to 12.0%, B 2 O 3 : 0.20% to 0.90%, Na 2 O+K 2 O: 0.40% to 0.80%, Al 2 O 3 : 0.3% to 2.0%, Y 2 O 3 : <2.0%, Fe 2 O 3 +TiO 2 : <0.6%, and other species: <1.5%.

First claim

The invention claimed is:

1 . A glass melting furnace comprising a block positioned in the superstructure and made of a fused cast refractory product comprising, as weight percentages on the basis of the oxides and for a total of 100%:

ZrO 2 :
balance to 100%

Hf 2 O:
<5%

SiO 2 :
 8.1% to 12.0%

B 2 O 3 :
0.20% to 0.90 %

Na 2 O + K 2 O:
0.40% to 0.80%

Al 2 O 3 :
 0.3% to 2.0%

Y 2 O 3 :
<2.0%

Fe 2 O 3 + TiO 2 :
<0.6%

other species:
<1.5%.

2 . The glass melting furnace as claimed in claim 1 , wherein, in the fused cast refractory product:

83.0% <
ZrO 2 + HfO 2 < 92.0%; and/or

8.4% <
SiO 2 < 11.5%; and/or

0.25% <
B 2 O 3 < 0.75%; and/or

0.45% <
Na 2 O + K 2 O < 0.75%; and/or

0.6% <
Al 2 O 3 < 1.9%; and/or

0.5% <
Y 2 O 3 < 1.9%; and/or

Fe 2 O 3 +
TiO 2 < 0.4%; and/or

other species <
1.2%.

3 . The glass melting furnace as claimed in claim 2 , wherein, in the fused cast refractory product:

84.0% <
ZrO 2 + HfO 2 < 90.0%; and/or

8.8% <
SiO 2 < 11.0%; and/or

0.40% <
B 2 O 3 < 0.70%; and/or

Na 2 O +
K 2 O < 0.65%; and/or

0.8% <
Al 2 O 3 < 1.7%; and/or

0.7% <
Y 2 O 3 < 1.7%; and/or

Fe 2 O 3 +
TiO 2 < 0.3%; and/or

other species <
1.0%.

4 . The glass melting furnace as claimed in claim 3 , wherein, in the fused cast refractory product:

85.0% <
ZrO 2 + HfO 2 < 90.0%; and/or

9.1% <
SiO 2 < 10.8%; and/or

B 2 O 3 <
0.60%; and/or

0.9% <
Al 2 O 3 ; and/or

1.0% <
Y 2 O 3 < 1.6%; and/or

Fe 2 O 3 +
TiO 2 < 0.2%; and/or

species other than
ZrO 2 , HfO 2 , SiO 2 , Y 2 O 3 ,

B 2 O 3 , Al 2 O 3 , Na 2 O, K 2 O,

TiO 2 and Fe 2 O 3 : < 0.5%.

5 . The glass melting furnace as claimed in claim 1 , wherein the fused cast refractory product comprises, as weight percentages on the basis of the oxides:

SiO 2 :
 8.5% to 11.0%

B 2 O 3 :
0.30% to 0.80%

Na 2 O + K 2 O:
0.40% to 0.70%

Al 2 O 3 :
 0.6% to 2.0%.

6 . The glass melting furnace as claimed in claim 1 , wherein the fused cast refractory product comprises, as weight percentages on the basis of the oxides:

SiO 2 :
 8.5% to 10.8%

B 2 O 3 :
0.30% to 0.70%

Na 2 O + K 2 O:
0.40% to 0.70%

Al 2 O 3 :
 1.0% to 1.8%.

7 . The glass melting furnace as claimed in claim 1 , wherein the fused cast refractory product comprises, as weight percentages on the basis of the oxides:

SiO 2 :
 9.1% to 11.0%

B 2 O 3 :
0.30% to 0.70%

Na 2 O + K 2 O:
0.40% to 0.70%

Al 2 O 3 :
 1.1% to 1.8%.

Assignees

• Saint Gobain Ct Recherches

Inventors

• Cabodi Isabelle
• Vespa Pierrick Fabien

Classifications

• C04B2235/72

  Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics · CPC title

• C04B2235/6565

  Cooling rate · CPC title

• C04B2235/6562

  Heating rate · CPC title

• C04B2235/447

  Phosphates or phosphites, e.g. orthophosphate or hypophosphite · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title