Inorganic fiber with improved shrinkage and strength

Patent metadata

Field	Value
Publication number	US-9708214-B2
Application number	US-201414580400-A
Country	US
Kind code	B2
Filing date	Dec 23, 2014
Priority date	Jul 16, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

An inorganic fiber containing silica and magnesia as the major fiber components and which further includes intended addition of lithium oxide to improve the thermal stability of the fiber. The inorganic fiber exhibits good thermal performance at 1260° C. and greater, low linear shrinkage, retains mechanical integrity after exposure to the use temperature, and exhibits low biopersistence in physiological fluids. Also provided are thermal insulation product forms prepared from a plurality of the inorganic fibers, methods of preparing the inorganic fiber and of thermally insulating articles using thermal insulation prepared from a plurality of the inorganic fibers.

First claim

The invention claimed is:

1. An inorganic fiber comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.45 weight percent lithium oxide, wherein said inorganic fiber does not melt until exposed to a temperature of 1500° C. or greater.

2. The inorganic fiber of claim 1 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.35 weight percent lithium oxide.

3. The inorganic fiber of claim 2 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.3 weight percent lithium oxide.

4. The inorganic fiber of claim 3 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.25 weight percent lithium oxide.

5. The inorganic fiber of claim 4 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.2 weight percent lithium oxide.

6. The inorganic fiber of claim 5 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.175 weight percent lithium oxide.

7. The inorganic fiber of claim 6 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.15 weight percent lithium oxide.

8. The inorganic fiber of claim 7 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.1 weight percent lithium oxide.

9. The inorganic fiber of claim 8 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.075 weight percent lithium oxide.

10. The inorganic fiber of claim 9 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.05 weight percent lithium oxide.

11. The inorganic fiber of claim 10 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.01 weight percent lithium oxide.

12. The inorganic fiber of claim 11 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 0.005 weight percent lithium oxide.

13. The inorganic fiber of claim 1 , comprising the fiberization product of about 65 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and lithium oxide in any one of the following ranges: (i) greater than 0 to about 0.05 weight percent, (ii) greater than 0 to about 0.045 weight percent, (iii) about 0.002 to about 0.04 weight percent, (iv) from about 0.005 to about 0.04 weight percent, (v) from about 0.01 to about 0.04 weight percent, (vi) from about 0.02 to about 0.04 weight percent, (vii) from about 0.03 to about 0.04 weight percent, or (viii) from about 0.035 to about 0.04 weight percent.

14. The inorganic fiber of claim 1 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.45 weight percent lithium oxide.

15. The inorganic fiber of claim 14 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.35 weight percent lithium oxide.

16. The inorganic fiber of claim 15 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.3 weight percent lithium oxide.

17. The inorganic fiber of claim 16 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.25 weight percent lithium oxide.

18. The inorganic fiber of claim 17 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.2 weight percent lithium oxide.

19. The inorganic fiber of claim 18 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.175 weight percent lithium oxide.

20. The inorganic fiber of claim 19 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.15 weight percent lithium oxide.

21. The inorganic fiber of claim 20 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.1 weight percent lithium oxide.

22. The inorganic fiber of claim 21 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.075 weight percent lithium oxide.

23. The inorganic fiber of claim 22 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.01 weight percent lithium oxide.

24. The inorganic fiber of claim 23 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and greater than 0 to about 0.005 weight percent lithium oxide.

25. The inorganic fiber of claim 14 , comprising the fiberization product of about 70 to about 80 weight percent silica, about 20 to about 30 weight percent magnesia, and lithium oxide in any one of the following ranges: (i) greater than 0 to about 0.05 weight percent, (ii) greater than 0 to about 0.045 weight percent, (iii) about 0.002 to about 0.04 weight percent, (iv) from about 0.005 to about 0.04 weight percent, (v) from about 0.01 to about 0.04 weight percent, (vi) from about 0.02 to about 0.04 weight percent, (vii) from about 0.03 to about 0.04 weight percent, or (viii) from about 0.035 to about 0.04 weight percent.

26. The inorganic fiber of claim 1 , comprising the fiberization product of about 75 to about 80 weight percent silica, about 20 to about 25 weight percent magnesia, and greater than 0 to about 0.45 weight percent lithium oxide.

27. The inorganic fiber of claim 26 , comprising the fiberization product of about 75 to about 80 weight percent silica, about 20 to about 25 weight percent magnesia, and greater than 0 to about 0.35 weight percent lithium oxide.

28. The inorganic fiber of claim 27 , comprising the fiberization product of about 75 to about 80 weight percent silica, about 20 to about 25 weight percent magnesia, and greater than 0 to about 0.3 weight percent lithium oxide.

29. The inorganic fiber of claim 28 , comprising the fiberization pro

Assignees

• Unifrax I Llc

Inventors

• Zhao Donghui
• Zoitos Bruce K
• Andrejcak Michael J
• Hamilton Jason M

Classifications

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• B29K2509/08

  Glass · CPC title

• C04B2235/3244

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

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title