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| 001 | 894452 | ||
| 005 | 20240711113618.0 | ||
| 024 | 7 | _ | |a 10.3390/met11071089 |2 doi |
| 024 | 7 | _ | |a 2128/28479 |2 Handle |
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| 037 | _ | _ | |a FZJ-2021-03231 |
| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |a Raumann, Leonard |0 P:(DE-Juel1)169774 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Improving the W Coating Uniformity by a COMSOL Model-Based CVD Parameter Study for Denser Wf/W Composites |
| 260 | _ | _ | |a Basel |c 2021 |b MDPI |
| 336 | 7 | _ | |a article |2 DRIVER |
| 336 | 7 | _ | |a Output Types/Journal article |2 DataCite |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1628770323_1986 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a ARTICLE |2 BibTeX |
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| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 520 | _ | _ | |a Tungsten (W) has the unique combination of excellent thermal properties, low sputter yield, low hydrogen retention, and acceptable activation. Therefore, W is presently the main candidate for the first wall and armor material for future fusion devices. However, its intrinsic brittleness and its embrittlement during operation bears the risk of a sudden and catastrophic component failure. As a countermeasure, tungsten fiber-reinforced tungsten (Wf/W) composites exhibiting extrinsic toughening are being developed. A possible Wf/W production route is chemical vapor deposition (CVD) by reducing WF6 with H2 on heated W fabrics. The challenge here is that the growing CVD-W can seal gaseous domains leading to strength reducing pores. In previous work, CVD models for Wf/W synthesis were developed with COMSOL Multiphysics and validated experimentally. In the present article, these models were applied to conduct a parameter study to optimize the coating uniformity, the relative density, the WF6 demand, and the process time. A low temperature and a low total pressure increase the process time, but in return lead to very uniform W layers at the micro and macro scales and thus to an optimized relative density of the Wf/W composite. High H2 and low WF6 gas flow rates lead to a slightly shorter process time and an improved coating uniformity as long as WF6 is not depleted, which can be avoided by applying the presented reactor model. |
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| 536 | _ | _ | |a EUROfusion - Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium (633053) |0 G:(EU-Grant)633053 |c 633053 |f EURATOM-Adhoc-2014-20 |x 1 |
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| 773 | _ | _ | |a 10.3390/met11071089 |g Vol. 11, no. 7, p. 1089 - |0 PERI:(DE-600)2662252-X |n 7 |p 1089 - |t Metals |v 11 |y 2021 |x 2075-4701 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/894452/files/Raumann_2021b_green_access.pdf |y OpenAccess |
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