Melted product with a high zirconium content

Patent metadata

Field	Value
Publication number	US-10239793-B2
Application number	US-201615552015-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Feb 20, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A fused-cast refractory product including, as mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO 2 +HfO 2 : remainder to 100%, with HfO 2 ≤5%; SiO 2 : 1.5% to 7.5%; Al 2 O 3 : 1.0% to 3.0%; CaO+SrO: 1.2% to 3.0%; Y 2 O 3 : 1.5% to 3.0%; Na 2 O+K 2 O: <0.15%; B 2 O 3 : <1.0%; P 2 O 5 : <0.15%; Fe 2 O 3 +TiO 2 : <0.55%; oxide species other than ZrO 2 , HfO 2 , SiO 2 , Al 2 O 3 , Na 2 O, K 2 O, B 2 O 3 , CaO, SrO, Y 2 O 3 , P 2 O 5 , Fe 2 O 3 and TiO 2 : <1.5%.

First claim

The invention claimed is:

1. Fused-cast refractory product comprising, as mass percentages on the basis of the oxides and for a total of 100% of the oxides:
ZrO 2 +HfO 2 : remainder to 100%, with HfO 2 ≤5%;
SiO 2 : 1.5% to 7.5%;
Al 2 O 3 : 1.0% to 3.0%;
CaO +SrO: 1.2% to 3.0%;
Y 2 O 3 : 1.5% to 3.0%;
Na 2 O [+] and K 2 O: <0.15%;
B 2 O 3 : <1.0%;
P 2 O 5 : <0.15%;
Fe 2 O 3 +TiO 2 : <0.55%;
oxide species other than ZrO 2 , HfO 2 , SiO 2 , Al 2 O 3 , Na 2 O, K 2 O, B 2 O 3 , CaO, SrO, Y 2 O 3 , P 2 O 5 , Fe 2 O 3 and TiO 2 : <1.5%.

2. Product according to claim 1 , in which the mass content of Y 2 O 3 is less than or equal to 2.5%.

3. Product according to claim 1 , in which the mass content of Y 2 O 3 is greater than or equal to 1.7%.

4. Product according to claim 1 , in which the mass content of CaO+SrO is less than or equal to 2.5%.

5. Product according to claim 1 , in which the mass content of CaO+SrO is greater than or equal to 1.3%.

6. Product according to claim 1 , in which the mass content of CaO+SrO is greater than or equal to 1.8%.

7. Product according to claim 1 , in which the mass content of silica SiO 2 is greater than or equal to 2.5%.

8. Product according to claim 1 , in which the mass content of silica SiO 2 is less than or equal to 7.0%.

9. Product according to claim 1 , in which the mass content of silica SiO 2 is less than or equal to 6.0%.

10. Product according to claim 1 , in which the mass content of Al 2 O 3 is less than or equal to 2.5%.

11. Product according claim in which the mass content of Al 2 O 3 is less than or equal to 2.3%.

12. Product according to claim 1 , in which the mass content of Al 2 O 3 is greater than or equal to 1.5%.

13. Product according to claim 1 , in which the mass content of B 2 O 3 is less than or equal to 0.5%.

14. Product according to claim 1 , in which:
the mass content of Na 2 O +K 2 O is less than or equal to 0.10%, and
the mass content of iron oxide and/or titanium oxide, Fe 2 O 3 +TiO 2 , is less than 0.4%, and
the mass content of P 2 O 5 is less than or equal to 0.05%, and
the total mass content of the oxide species other than ZrO 2 , HfO 2 , SiO 2 , Al 2 O 3 , Na 2 O, K 2 O, B 2 O 3 , CaO, SrO, Y 2 O 3 , P 2 O 5 , Fe 2 O 3 and TiO 2 is less than 1.0%.

15. Product according to claim 1 , in which the ratio of the mass content of silica to the content of boron oxide SiO 2 /B 2 O 3 is greater than or equal to 8.

Assignees

• Saint Gobain Ct Recherches
• Saint Gobain Centre De Rech Et Detudes European

Inventors

• Cabodi Isabelle
• Gaubil Michel Marc
• Morand Christel

Classifications

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title

• C04B2235/447

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

• C04B2235/3218

  Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title