Molded article made of a molybdenum-aluminum-titanium alloy

Patent metadata

Field	Value
Publication number	US-11306375-B2
Application number	US-202016796284-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 26, 2019
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Heraeus Deutschland Gmbh & Co Kg
• Deutschland Gmbh & Co Kg

Inventors

• Herbst Stephan
• Spaniol Bernd

Classifications

• C30B35/002

  Crucibles or containers · CPC title

• C22C27/04 Primary

  Alloys based on tungsten or molybdenum · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• B22D21/022 Primary

  Casting heavy metals, with exceedingly high melting points, i.e. more than 1600 degrees C, e.g. W 3380 degrees C, Ta 3000 degrees C, Mo 2620 degrees C, Zr 1860 degrees C, Cr 1765 degrees C, V 1715 degrees C · CPC title

• C30B15/10

  Crucibles or containers for supporting the melt · CPC title