Method of manufacturing high performance glass fibers in a refractory lined melter and fiber formed thereby
View Patent ↗A method of forming high strength glass fibers in a refractory lined glass melter is disclosed. The refractory lined melter is suited to the batch compositions disclosed for the formation high modulus, and high-strength glass fibers. The glass composition for use in the method of the present invention is up to about 70.5 Weight % SiO 2 , 24.5 weight % Al 2 O 3 , 22 weight % alkaline earth oxides and may include small amounts of alkali metal oxides and ZrO 2 . Oxide based refractories included alumina, chromic oxide, silica, alumina-silica, zircon, zirconia-alumina-silica and combinations thereof. By using oxide based refractory lined furnaces the cost of production of glass fibers is substantially reduced in comparison with the cost of fibers using a platinum lined melting furnace. Fibers formed by the present invention are also disclosed.
1. A process for producing glass fibers from raw glass batch in a refractory lined glass melter, the process comprising the steps of:
charging raw glass batch to the melting zone of the glass melter, the glass batch comprising:
about 60.5 to about 70.5 weight percent SiO 2 ;
about 10 to about 24.5 weight percent Al 2 O 3 ;
about 15.0 to about 20.0 weight percent RO, where RO equals the sum of MgO, CaO, SrO and BaO in the batch composition, 5 to 11.33 weight percent of the RO being MgO; and
about 0 to about 3 weight percent alkali metal oxides;
heating the glass batch to a forming temperature in excess of the liquidus temperature of a resulting glass to form a fiberizable molten glass; and
fiberizing said molten glass.
2. The process of claim 1 , wherein the glass batch comprises:
less than 4 weight percent of compounds selected from the group consisting of ZnO, SO 3 , Fluorine, B 2 O 3 , TiO 2 and Fe 2 O 3 .
3. The process of claim 1 , wherein glass produced from said batch has a fiberizing temperature of less than about 2650° F., and a ΔT of at least about 80° F.
4. The process of claim 3 wherein glass produced from said batch has a ΔT of at least 120° F.
5. The process of claim 1 , wherein the glass melter is lined with a refractory material selected from the group consisting essentially of alumina, silica, chromic oxide, alumina-silica, zircon, zirconia-alumina-silica and combinations thereof.
6. The process of claim 1 , wherein glass produced from the batch is fiberized at a forming temperature of less than about 2650° F.
7. A process for producing glass from raw glass-forming material in a refractory lined glass melter, the glass melter having a roof, a bottom and side walls defining an elongated channel having a melting zone and a downstream refining zone, the process comprising the steps of:
charging raw glass batch to the melting zone of the glass melter, the glass batch comprising:
60.5-70.5 weight percent SiO 2 ;
10-24.5 weight percent Al 2 O 3 ;
15.0 to 20.0 weight percent RO, where RO equals the sum of MgO, CaO, SrO and BaO in the batch composition, 5 to 11.33 weight percent of the RO being MgO; and
0 to 3 weight percent alkali metal oxides; and
0 to 3 weight percent ZrO 2
providing at least one burner within the roof of the glass melter; and
melting the glass batch to form a fiberizable molten glass.
8. The process of claim 7 , wherein the glass melter is lined with a refractory material selected from the group consisting essentially of alumina, chromic oxide, silica, alumina-silica, zircon, zirconia-alumina-silica and combinations thereof.
9. The process of claim 7 , wherein the glass produced from the batch is fiberized at a forming temperature of less than 2650° F.
10. A process for producing glass from a raw glass-forming material in a refractory lined glass melter; the glass melter having a root a bottom and side walls defining an elongated channel having a melting zone and a downstream refining zone, the process comprising the steps of:
charging raw glass batch to the melting zone of the glass melter; the glass batch comprising:
60.5-70.5 weight percent SiO 2;
10-24.5 weight percent Al 2 O 3;
15.0 to 20.0 weight percent RO, where RO equals the sum of MgO, CaO, SrO and BaO in the batch composition, 5 to 11.33 weight percent of the RO being MgO; and
0 to 3 weight percent alkali metal oxides providing at least one burner within the roof of the glass melter; and
melting the glass batch to form a fiberizable molten glass.
11. The process of claim 10 , wherein the glass melter is lined with a refractory material selected from the group consisting essentially of alumina, chromie oxide, silica, alumina-silica, zircon, zirconia-alumina-silica and combinations thereof
12. The process of claim 10 , wherein the glass produced from the batch is fiberized at a foiming temperature of less than 2650° F.
13. The process of claim 10 , wherein the glass batch comprises:
less than 4 weight percent of compounds selected from the group consisting of ZnO, ZrO 2 , SO 3 , Fluorine, B 2 O 3 , TiO 2 and Fe 2 O 3 .
14. The process of claim 13 , wherein the glass melter is lined with a refractory material selected from the group consisting essentially of alumina, chromic oxide, silica, alumina-silica, zircon, zirconia-alumina-silica and combinations thereof.
15. The process of claim 13 , wherein the glass produced from the batch is fiberized at a forming temperature of less than 2650° F.