Tungsten containing forming mandrel for glass forming

1. A molding tool for reshaping hollow-body glass precursors, comprising a forming mandrel for reshaping at least a portion of a heated region of the glass precursor, the forming mandrel comprising a temperature-stable core material and an alloying element, the core material comprises a precious metal selected from the group consisting of iridium, palladium, rhenium, ruthenium, and any combinations or alloys based thereon, and the alloying element comprises tungsten in an amount of at least 0.01 wt % wherein the forming mandrel is configured to be introduced into an interior of each hollow-body glass precursor and configured to prevent introduction of impurities into an interior of the hollow-body glass precursors.

2. The molding tool as claimed in claim 1 , wherein the alloying element further comprises a material selected from the group consisting of zirconium, rhodium, molybdenum, ruthenium, and rhenium.

3. The molding tool as claimed in claim 1 , wherein the core material further comprises a material selected from the group consisting of platinum, rhodium, and any combinations or alloys based thereon.

4. The molding tool as claimed in claim 1 , wherein the core material further comprises at least 20 wt % of platinum.

5. The molding tool as claimed in claim 1 , wherein the core material further comprises at least 5 wt % of rhodium.

6. The molding tool as claimed in claim 1 , wherein the core material is a platinum-rhodium alloy including at least 20 wt % of platinum and at least 5 wt % of rhodium.

7. The molding tool as claimed in claim 1 , wherein the core material is a platinum-rhodium alloy including at least 25 wt % of platinum and at least 7 wt % of rhodium.

8. The molding tool as claimed in claim 1 , wherein the core material is a platinum-rhodium alloy including at least 30 wt % of platinum and at least 10 wt % of rhodium.

9. The molding tool as claimed in claim 1 , wherein the core material is a platinum-nickel alloy including at least 5 wt % of nickel.

10. The molding tool as claimed in claim 1 , wherein the core material is a platinum-iridium alloy including at least 5 wt % of iridium.

11. The molding tool as claimed in claim 1 , wherein the core material is a platinum-iridium alloy including at least 20 wt % of iridium.

12. The molding tool as claimed in claim 1 , wherein the core material comprises at least 20 wt % of iridium.

13. The molding tool as claimed in claim 1 , wherein the core material comprises at least 90 wt % of iridium.

14. The molding tool as claimed in claim 1 , wherein the amount of the tungsten is at least 0.9 wt %.

15. The molding tool as claimed in claim 1 , wherein the amount of the tungsten is at most 5 wt %.

16. The molding tool as claimed in claim 1 , wherein the core material is an iridium-tungsten alloy with at least 0.1 wt % of tungsten.

17. The molding tool as claimed in claim 16 , wherein the iridium-tungsten alloy comprises 0.96 wt % of tungsten, or 1.92 wt % of tungsten, or 3.84 wt % of tungsten.

18. An apparatus for reshaping hollow-body glass precursors, comprising:

a heater configured to locally heat a region of the glass precursor to above a softening point; and

a molding tool having a forming mandrel for reshaping at least a portion of the region of the glass precursor, the forming mandrel comprising a temperature-stable core material and an alloying element, the core material comprises a precious metal selected from the group consisting of iridium, palladium, rhenium, ruthenium, and any combinations or alloys based thereon, and the alloying element comprises tungsten in an amount of at least 0.01 wt %, wherein the forming mandrel is configured to be introduced into an interior of each hollow-body glass precursor and configured to prevent introduction of impurities into an interior of the hollow-body glass precursors.

19. The apparatus as claimed in claim 18 , wherein the heater is a laser and the apparatus further comprises a rotation device configured to rotate the molding tool and the glass precursor relative to each other, wherein the molding tool is configured so that a surface area of the portion is not covered by the molding tool so that, during reshaping, light from the laser is irradiated onto the portion.

20. A molding tool for reshaping hollow-body glass precursors, comprising:

a forming mandrel comprising a temperature-stable core material and an alloying element,

wherein the core material comprises a precious metal selected from the group consisting of iridium, palladium, rhenium, ruthenium, and any combinations or alloys based thereon, and

wherein the alloying element comprises tungsten in an amount of at least 0.01 wt % and a material selected from the group consisting of zirconium, rhodium, molybdenum, ruthenium, and rhenium, wherein the forming mandrel is configured to be introduced into an interior of each hollow-body glass precursor and configured to prevent introduction of impurities into an interior of the hollow-body glass precursors.

21. A molding tool for reshaping hollow-body glass precursors, comprising:

a forming mandrel for reshaping at least a portion of a heated region of the glass precursor, the forming mandrel comprising a temperature-stable core material and an alloying element,

wherein the temperature-stable core material comprises a material selected from the platinum group elements,

wherein the alloying element comprises tungsten in an amount of at least 0.01 wt % and a material selected from the group consisting of zirconium, rhodium, molybdenum, ruthenium, and rhenium, wherein the forming mandrel is configured to be introduced into an interior of each hollow-body glass precursor and configured to prevent introduction of impurities into an interior of the hollow-body glass precursors.

22. The molding tool as claimed in claim 21 , wherein the amount of the tungsten is at least 0.9 wt %.

23. The molding tool as claimed in claim 21 , wherein the amount of the tungsten is at most 5 wt %.