Alumina-rich glasses and methods for making the same

Patent metadata

Field	Value
Publication number	US-9359244-B2
Application number	US-201414283510-A
Country	US
Kind code	B2
Filing date	May 21, 2014
Priority date	May 21, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The invention relates to new glass formulations with alumina contents greater than 35 mol % and methods for making these glasses. The glass may be a porous glass or a dense glass.

First claim

What is claimed is:

1. A method for producing a porous high alumina content glass, comprising:
mixing greater than about 20 mol % alumina and between about 30 mol % and about 80 mol % of an oxide to produce a mixture;
heat treating the mixture to produce a phase separated material comprising an alumina-rich phase and an alumina-lean phase;
cooling the phase separated material; and
leaching the alumina-lean phase from the phase separated material to produce the porous high alumina content glass, wherein an acid utilized in the leaching is at least one of a hydrochloric acid, a nitric acid, a sulfuric acid, a phosphoric acid, a hydrobromic acid, a hydrofluoric acid, a halogen oxoacids water, or boiling water.

2. The method of claim 1 , wherein the oxide may be at least one of B 2 O 3 , P 2 O 5 , Na 2 O, K 2 O, Li 2 O, CaO, MgO, SrO, BaO, SiO 2 , and TiO 2 .

3. The method of claim 1 , wherein an alumina content of the porous high alumina content glass is between about 20 mol % and about 75 mol %.

4. The method of claim 1 , wherein the heat-treating step is at a temperature between about 300° C. and about 1000° C.

5. The method of claim 1 , wherein further comprising calcining the mixture.

6. The method of claim 1 , further comprising:
washing the porous high alumina content glass with a water to produce a washed glass;
drying the washed glass to produce a dry glass; and
firing the dry glass to produce a dense high alumina content glass.

7. The method of claim 6 , wherein a firing temperature is between about 500° C. and about 900° C.

8. A porous high alumina content glass comprising:
greater than about 20 mol % alumina;
an oxide; and
a dopant, wherein the dopant is at least one of tin oxide, cerium oxide, sulfur oxide, water, cobalt oxide, copper oxide, gold, or silver.

9. The glass of claim 8 , wherein the oxide is selected from the group consisting of B 2 O 3 , P 2 O 5 , Na 2 O, K 2 O, Li 2 O, CaO, MgO, SrO, BaO, SiO 2 , TiO 2 and mixtures thereof.

10. The glass of claim 8 , wherein an oxide content is between about 30 mol % and about 80 mol % of the porous high alumina content glass.

11. The glass of claim 8 , wherein a porosity of the porous high alumina content glass is between about 0% and about 35%.

12. A method to form a high content alumina glass, comprising:
mixing an alumina powder and an oxide powder to form a mixture, wherein the alumina powder comprises at least about 20 mol % of the mixture and wherein the oxide comprises at least about 30 mol % of the mixture;
calcining the mixture to form a calcined mixture;
melting the calcined mixture to form a melt;
quenching the melt to form a quenched material;
annealing the quenched material to form an annealed material;
nucleating the annealed material to form a material;
phase separating the material to form a separated material comprising an alumina-rich phase and an alumina-lean phase; and
leaching the separated material to leach the alumina-lean phase to produce the high content alumina glass.

13. The method of claim 12 , wherein the calcination occurs in air at a calcination temperature between about 300° C. and about 600° C.

14. The method of claim 12 , wherein a melting temperature is between about 1000° C. and about 1500° C.

15. The method of claim 12 , wherein an annealing temperature is between about 300° C. and about 600° C.

16. The method of claim 12 , wherein a nucleation is between about 300° C. and about 600° C.

17. The method of claim 12 , wherein an acid of the leaching step is at least one of a hydrochloric acid, a nitric acid, a sulfuric acid, a phosphoric acid, a hydrobromic acid, a hydrofluoric acid, or a halogen oxoacids water.

18. The method of claim 12 , further comprising:
washing the high content alumina glass to produce a washed glass;
drying the washed glass to produce a dry glass; and
firing the dry glass to produce a dense high content alumina glass.

19. The method of claim 1 , further comprising melting the mixture at a temperature between about 1000° C. and 1500° C.

20. The method of claim 1 , wherein the leaching occurs at a temperature between about 25° C. and about 100° C.

Assignees

• Colorado School Of Mines

Inventors

• Cornejo Ivan A
• Reimanis Ivar E

Classifications

• C03C11/005

  obtained by leaching after a phase separation step · CPC title

• C03C3/064 Primary

  containing boron · CPC title

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title

• C03C23/008

  comprising a lixiviation step · CPC title