Production of a refractory metal component
View Patent ↗The embodiments relate to a method for the production of a refractory metal component by casting. The method includes providing a slip that contains a powder including at least one refractory metal or a compound thereof, in addition to at least one binding agent. The method further includes processing the slip by casting, (e.g., film casting or slip casting), to form at least one slip coating, the slip being devoid of a metal binding agent. A component was produced by this method. The embodiments may be used, in particular, on X-ray tubes, accelerator targets, or fusion reactors, such as for a surface of an X-ray anode, or a wall of a fusion reactor.
1. A process for producing a surface of an X-ray anode or a wall of a fusion reactor by casting, wherein the process comprises:
providing a slip comprising a powder of at least one refractory metal or a compound thereof and also at least one binder, wherein a proportion of the refractory metal in the slip is 70% by weight to 99% by weight; and
tape casting or slip casting the slip to provide a plurality of slip layers having individual slip layers stacked on top of one another,
wherein the slip is free of a metal binder.
2. The process as claimed in claim 1 , wherein the slip further comprises ceramic particles.
3. The process as claimed in claim 2 , wherein the ceramic particles comprise one or more of the following: La 2 O 3 , Y 2 O 3 , TiC, or HfC.
4. The process as claimed in claim 2 , wherein a median of a particle size of the powder is less than two microns.
5. The process as claimed in claim 1 , wherein the powder is a powder of pure tungsten, WRe, or WTa.
6. The process as claimed in claim 1 , wherein the binder comprises at least one organic binder.
7. The process as claimed in claim 1 , wherein a layer thickness of a slip layer of the plurality of slip layers is 20 microns to 3 millimeters.
8. A process for producing a surface of an X-ray anode or a wall of a fusion reactor by casting, wherein the process comprises:
providing a slip comprising a powder of at least one refractory metal or a compound thereof and also at least one binder, wherein a proportion of the refractory metal in the slip is 70% by weight to 99% by weight; and
tape casting the slip to a carrier tape to provide at least one flexible slip layer,
wherein the slip is free of a metal binder.
9. The process as claimed in claim 1 , wherein at least two slip layers of the plurality of slip layers differ in terms of their respective properties.
10. The process as claimed in claim 1 , wherein the processing of the slip is followed by heat-treating the plurality of slip layers.
11. The process as claimed in claim 10 , wherein the heat-treating comprises sintering below a maximum sintering temperature to a density below a maximum density and subsequently a further heat-treating of further densification.
12. The process as claimed in claim 10 , wherein the plurality of slip layers becomes at least closed-pored as a result of the heat-treating.
13. The process as claimed in claim 1 , wherein the plurality of slip layers comprises green sheets.
14. The process as claimed in claim 10 , wherein the heat-treating comprises sintering of the plurality of slip layers.
15. The process as claimed in claim 1 , wherein the plurality of slip layers is a gradient structure achieved by layering tungsten sheets with tungsten-rhenium sheets.
16. The process as claimed in claim 1 , wherein the plurality of slip layers is a gradient structure achieved by layering alternating dense tungsten sheets and porous tungsten sheets.
17. The process as claimed in claim 1 , wherein the slip further comprises a plasticizer.