Molded article made of a molybdenum-aluminum-titanium alloy
The invention relates to a molded article made of a metallic molybdenum-based alloy with at least 3 wt. % up to a maximum of 8 wt. % aluminum, at least 3 wt. % up to a maximum of 6 wt. % titanium and, as the remainder, molybdenum including the usual impurities, wherein the molded article is produced directly or indirectly by means of solidification from a melt. The invention also relates to a method for producing a molded article and to the use of such a molded article.
1. A molded article consisting of a metallic molybdenum-based alloy, the metallic molybdenum-based alloy consisting of at least 4 wt. % up to a maximum of 8 wt. % aluminum, at least 3 wt. % up to a maximum of 6 wt. % titanium and, as the remainder, molybdenum and impurities associated therewith, wherein the molded article is produced by solidifying a melt in a casting mold.
2. The molded article of claim 1 , wherein the impurities are a maximum of 1 at % of the molybdenum-based alloy.
3. The molded article of claim 1 , wherein the impurities comprise one or more of the elements zirconium, carbon, hafnium, lanthanum, yttrium, cerium, copper, rhenium, niobium, tantalum and tungsten.
4. The molded article of claim 1 , wherein the molybdenum-based alloy has 5.3±0.5 wt. % aluminum and 4.7±0.5 wt. % titanium.
5. The molded article of claim 1 , wherein the molded article is a crucible, a rod, a rod having a point for use as a crystal nucleus for crystal growing, a sheet, a plate, a pipe, a heating coil or a heater rod.
6. The molded article of claim 1 , wherein the molded article has a cylindrical outer wall at least in certain areas.
7. The molded article of claim 1 , wherein the molded article contains 86 to 92 wt. % molybdenum.
8. The molded article of claim 1 , wherein the molded article contains 4 to 6 wt. % aluminum.
9. The molded article of claim 1 , wherein the molded article contains at least 4 wt. % up to a maximum of 6 wt. % titanium.
10. A method for producing a molded article from a molybdenum-based alloy consisting of 4 wt. % to 8 wt. % aluminum, 3 wt. % to 6 wt. % titanium and, as the remainder, molybdenum and impurities associated therewith, the method comprising the following chronologically successive steps:
A) producing a melt consisting of 4 wt. % to 8 wt. % aluminum, 3 wt. % to 6 wt. % titanium and, as the remainder, molybdenum and impurities associated therewith,
B) pouring the melt into a casting mold and solidifying the melt in the casting mold to form a molded article in the casting mold, and
C) releasing the molded article thus obtained from the casting mold.
11. The method of claim 10 , wherein the molded article obtained from the casting mold contains 86 to 92 wt. % molybdenum.
12. The method of claim 10 , wherein, in step A), the melt is melted from pure metals of molybdenum, aluminum and titanium, and the impurities associated therewith, wherein the impurities are present in an amount of less than 1 at %.
13. The method of claim 10 , further comprising:
D) reshaping the molded article,
wherein step D) is performed after step C).
14. The molded article of claim 1 , the molded article capable of replacing an iridium material.
15. A molded article formed by the method of claim 10 , the molded article capable of replacing an iridium material.
16. The method of claim 13 , wherein reshaping comprises one or more of deburring, cutting, rolling, drawing, polishing and milling.
17. The molded article of claim 1 , wherein the melt consists of aluminum, titanium, molybdenum and the associated impurities.
18. A molded article consisting of a metallic molybdenum-based alloy, the metallic molybdenum-based alloy consisting of at least 4 wt. % up to a maximum of 8 wt. % aluminum, at least 3 wt. % up to a maximum of 6 wt. % titanium and, as the remainder, molybdenum and impurities associated therewith, wherein
the molded article is a crucible, a rod, a rod having a point for use as a crystal nucleus for crystal growing, a sheet, a plate, a pipe, a heating coil or a heater rod; and
the molded article is produced directly or indirectly by means of solidification from a melt.
19. The molded article of claim 18 , wherein the impurities are a maximum of 1 at % of the molybdenum-based alloy.
20. The molded article of claim 18 , wherein the impurities comprise one or more of the elements zirconium, carbon, hafnium, lanthanum, yttrium, cerium, copper, rhenium, niobium, tantalum and tungsten.
21. The molded article of claim 18 , wherein the molybdenum-based alloy has 5.3±0.5 wt. % aluminum and 4.7±0.5 wt. % titanium.
22. The molded article of claim 18 , wherein the molded article is produced by a mold casting.
23. The molded article of claim 18 , wherein the molded article contains 86 to 92 wt. % molybdenum.
24. The molded article of claim 18 , wherein the molded article contains 4 to 6 wt. % aluminum.
25. The molded article of claim 18 , wherein the molded article contains at least 4 wt. % up to a maximum of 6 wt % titanium.