NDLI: Molybdenum armour layer on copper plates: Manufacturing technologies and tests of prototypes

Content Provider	IEEE Xplore Digital Library
Author	Pavei, M. Dal Bello, S. Groeneveld, H. Marcuzzi, D. Rizzolo, A.
Copyright Year	2013
Description	Author affiliation: Consorzio RFX, Padua, Italy (Pavei, M.; Dal Bello, S.; Marcuzzi, D.; Rizzolo, A.) \|\| 3D-Metal Forming B.V., Lelystad, Netherlands (Groeneveld, H.)
Abstract	In the framework of the activities for the development of the Neutral Beam Injector (NBI) for ITER, the design of the MITICA device, including a plasma Source, a negative-Ion Accelerator and a Neutralizer has been recently finalized at Consorzio RFX. Among the most critical components of the plasma source are the rear vertical plates which enclose the plasma in the vicinity of the RF drivers and are hit by the back-streaming positive ions that are generated, mostly for stripping losses, inside the 1 MV electrostatic accelerator. On the basis of the physics-optical simulations of the negative-ion accelerator, the geometrical power density pattern and the energy spectrum of the back accelerated positive ions have been calculated, together with their sputtering rate on the impinged surfaces of the plasma source. The use of copper plates with an armour layer having low sputtering yield was established to be necessary for minimizing the pollution of the plasma and for preserving the component functionality. Molybdenum and Tungsten are the most suitable materials for the aim; nevertheless the minimum required thickness is approximately 0.5 mm. In order to verify the possibility of manufacturing such a thick armour layer, having a quite complex geometry and strict tolerance requirements, plasma spraying and explosion bonding techniques have been selected and investigated. The explosion bonding process has been found indeed to be the most suitable. In the paper the set up of the explosion bonding process of molybdenum on copper and the forming of the samples according to the component specifications are presented. The results of the test on explosion bonding and on plasma spraying prototypes are also reported, together with microscopic, outgassing, delamination, thermal shock, and thermal fatigue analyses. The results of the tests are presented in this paper, giving an overview on the critical technological aspects and on the still open issues in view of the manufacturing of the final components.
Starting Page	1
Ending Page	6
File Size	742431
Page Count	6
File Format	PDF
e-ISBN	9781479901715
DOI	10.1109/SOFE.2013.6635391
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Copper Explosions Bonding Plasma sources Heating Explosion bonding NBI Plasma facing components Molybdenum
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in