Magnesium aluminosilicate glass ceramics

Patent metadata

Field	Value
Publication number	US-12017947-B2
Application number	US-202217724810-A
Country	US
Kind code	B2
Filing date	Apr 20, 2022
Priority date	Jul 23, 2018
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A glass-ceramic includes SiO 2 in a range of 40 mol. % to 80 mol. %; Al 2 O 3 in a range of 5 mol. % to 20 mol. %; MgO in a range of 5 mol. % to 20 mol. %; and at least one of B 2 O 3 , ZnO, and TiO 2 , each in a range of 0 mol. % to 10 mol. %, such that the glass-ceramic further comprises a magnesium aluminosilicate crystalline phase at a concentration in a range of 5 wt. % to 80 wt. % of the glass-ceramic.

First claim

What is claimed is:

1. A glass-ceramic, comprising:
SiO 2 in a range of 40 mol. % to 80 mol. %;
Al 2 O 3 in a range of 5 mol. % to 20 mol. %;
MgO in a range of 5 mol. % to 20 mol. %; and
at least one of B 2 O 3 , ZnO, and TiO 2 , each in a range of 0 mol. % to 10 mol. %,
wherein the glass-ceramic further comprises a magnesium aluminosilicate crystalline phase at a concentration in a range of 5 wt. % to 80 wt. % of the glass-ceramic, the magnesium aluminosilicate crystalline phase comprising MgTi 2 O 5 , and
wherein the glass-ceramic is alkali free.

2. The glass-ceramic of claim 1 , comprising:
SiO 2 in a range of 55 mol. % to 75 mol. %;
Al 2 O 3 in a range of 9 mol. % to 15 mol. %; and
MgO in a range of 7 mol. % to 15 mol. %.

3. The glass-ceramic of claim 1 , comprising:
at least two of B 2 O 3 , ZnO, and TiO 2 , each in a range of 0 mol. % to 10 mol. %.

4. The glass-ceramic of claim 1 , wherein the magnesium aluminosilicate crystalline phase further comprises one or more of MgAl 2 O 4 /ZnAl 2 O 4 , TiO 2 , MgSiO 3 , ZrO 2 , Mg 2 Al 4 Si 5 O 18 , Mg-stuffed β-quartz, and SiO 2 .

5. The glass-ceramic of claim 1 , wherein the magnesium aluminosilicate crystalline phase further comprises two or more of MgAl 2 O 4 /ZnAl 2 O 4 , TiO 2 , MgSiO 3 , ZrO 2 , Mg 2 Al 4 Si 5 O 18 , Mg-stuffed β-quartz, and SiO 2 .

6. The glass-ceramic of claim 1 , wherein the magnesium aluminosilicate crystalline phase further comprises at least three of MgAl 2 O 4 /ZnAl 2 O 4 , TiO 2 , MgSiO 3 , ZrO 2 , Mg 2 Al 4 Si 5 O 18 , Mg-stuffed β-quartz, and SiO 2 .

7. The glass-ceramic of claim 1 , wherein the magnesium aluminosilicate crystalline phase further comprises MgAl 2 O 4 /ZnAl 2 O 4 .

8. The glass-ceramic of claim 7 , wherein the magnesium aluminosilicate crystalline phase further comprises: ZrO 2 ; TiO 2 ; MgSiO 3 ; TiO 2 and ZrO 2 ; TiO 2 and MgSiO 3 ; ZrO 2 and MgSiO 3 ; TiO 2 , MgSiO 3 , and Mg 2 Al 4 Si 5 O 18 ; TiO 2 , MgSiO 3 , and Mg-stuffed β-quartz; or TiO 2 , MgSiO 3 , Mg 2 Al 4 Si 5 O 18 , and Mg-stuffed β-quartz.

9. The glass-ceramic of claim 1 , wherein the glass-ceramic is configured for a dielectric loss of 0.001 or less for signals having a frequency of 1 GHz or less.

10. The glass-ceramic of claim 1 , wherein the glass-ceramic is configured for a dielectric loss of 0.001 or less for signals having a frequency of 10 GHz or less.

11. The glass-ceramic of claim 1 , wherein the glass-ceramic is configured for a dielectric loss of 0.001 or less for signals having a frequency of 10 GHz or more.

12. The glass-ceramic of claim 11 , wherein the glass-ceramic is configured for a dielectric loss of 0.001 or less for signals having a frequency in a range of 25 GHz to 60 GHz.

13. The glass-ceramic of claim 1 , wherein the glass-ceramic is configured for a dielectric constant below 6.0.

14. The glass-ceramic of claim 1 , wherein the glass-ceramic is configured as a two-dimensional plane having at least one minimum dimension of 1 cm.

15. An antenna, semiconductor circuit, or signal transmission structure comprising the glass-ceramic of claim 1 .

16. The glass-ceramic of claim 1 , wherein the magnesium aluminosilicate crystalline phase is at a concentration in a range of 10 wt. % to 75 wt. % of the glass-ceramic.

17. A method of forming a glass-ceramic, comprising:
mixing a plurality of oxides to form a precursor composition;
melting the precursor composition at a temperature of at least 1500° C. for a time in a range of 1 hr to 24 hrs;
annealing at a temperature of at least 500° C.; and
ceramming at a temperature in a range of 750° C. to 1150° C. for a time in a range of 1 hr to 10 hrs to form the glass-ceramic, the glass-ceramic comprising:
SiO 2 in a range of 40 mol. % to 80 mol. %;
Al 2 O 3 in a range of 5 mol. % to 20 mol. %;
MgO in a range of 5 mol. % to 20 mol. %;
at least one of B 2 O 3 , ZnO, and TiO 2 , each in a range of 0 mol. % to 10 mol. %; and
a magnesium aluminosilicate crystalline phase at a concentration in a range of 5 wt. % to 80 wt. % of the glass-ceramic, the magnesium aluminosilicate crystalline phase comprising MgTi 2 O 5 ,
wherein the glass-ceramic is alkali free.

18. The method of claim 17 , wherein the plurality of oxides includes at least two of SiO 2 , Al 2 O 3 , MgO, B 2 O 3 , ZnO, TiO 2 , or ZrO 2 .

19. The method of claim 17 , further comprising:
drigaging the melt prior to the step of annealing.

20. The method of claim 17 , wherein the ceramming is conducted at a temperature in a range of 800° C. to 1000° C. for a time in a range of 2 hrs to 6 hrs.

Assignees

• Corning Inc

Inventors

• Beall George Halsey
• Boek Heather Debra
• Cai Ling
• Weller Mark Owen

Classifications

• C03C2203/10

  Melting processes · CPC title

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title

• C03C4/16

  for dielectric glass · CPC title

• C03B27/012

  by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling (C03B27/008, C03B27/016 take precedence) · CPC title

• C03C3/091

  containing aluminium · CPC title