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000894452 1001_ $$0P:(DE-Juel1)169774$$aRaumann, Leonard$$b0$$eCorresponding author
000894452 245__ $$aImproving the W Coating Uniformity by a COMSOL Model-Based CVD Parameter Study for Denser Wf/W Composites
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000894452 520__ $$aTungsten (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.
000894452 536__ $$0G:(DE-HGF)POF4-1232$$a1232 - Power-based Fuels and Chemicals (POF4-123)$$cPOF4-123$$fPOF IV$$x0
000894452 536__ $$0G:(EU-Grant)633053$$aEUROfusion - Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium (633053)$$c633053$$fEURATOM-Adhoc-2014-20$$x1
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000894452 7001_ $$0P:(DE-Juel1)2594$$aCoenen, Jan Willem$$b1
000894452 7001_ $$0P:(DE-HGF)0$$aRiesch, Johann$$b2
000894452 7001_ $$0P:(DE-Juel1)165931$$aMao, Yiran$$b3$$ufzj
000894452 7001_ $$0P:(DE-Juel1)174255$$aSchwalenberg, Daniel$$b4$$ufzj
000894452 7001_ $$0P:(DE-HGF)0$$aGietl, Hanns$$b5
000894452 7001_ $$0P:(DE-Juel1)157640$$aLinsmeier, Christian$$b6
000894452 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b7$$ufzj
000894452 773__ $$0PERI:(DE-600)2662252-X$$a10.3390/met11071089$$gVol. 11, no. 7, p. 1089 -$$n7$$p1089 -$$tMetals$$v11$$x2075-4701$$y2021
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