Fabrication and characterization of tungsten and graphite based PFC for divertor target elements of ITER like tokamak application

Khirwadkar, S.S.; Singh, K. P.; Patil, Yashashri; Khan, Mohammad Shoaib; Buch, J.; Patel, Ankit R.; Tripathi, Sudhir; Jaman, PM; Rangaraj, Lingappa; Divakar, C

doi:10.1016/j.fusengdes.2011.01.111

Cited by 28 publications

(6 citation statements)

References 8 publications

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“…Oxygen free high thermal conductivity (OFHC) copper was cast on each tile at the temperature of 1125°C. OFHC copper casted tiles were brazed to a CuCrZr alloy heat sink using desirable brazing fi ller NiCuMn-37 for copper to copper alloy joint [5].…”

Section: Macro-brush Type Mock-upmentioning

confidence: 99%

R&D on divertor plasma facing components at the Institute for Plasma Research

et al. 2015

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This paper is focused on various aspects of the development and testing of water cooled divertor PFCs. Divertor PFCs are mainly designed to absorb the heat and particle fluxes outflowing from the core plasma of fusion devices like ITER. The Divertor and First Wall Technology Development Division at the Institute for Plasma Research (IPR), India, is extensively working on development and testing of divertor plasma facing components (PFCs). Tungsten and graphite macro-brush type test mock-ups were produced using vacuum brazing furnace technique and tungsten monoblock type of test mock-ups were obtained by hot radial pressing (HRP) technique. Heat transfer performance of the developed test mock-ups was tested using high heat flux tests with different heat load conditions as well as the surface temperature monitoring using transient infrared thermography technique. Recently we have established the High Heat Flux Test Facility (HHFTF) at IPR with an electron gun EH300V (M/s Von Ardenne Anlagentechnik GmbH, Germany) having maximum power 200 kW. Two tungsten monoblock type test mock-ups were probed using HHFTF. Both of the test mock-ups successfully sustained 316 thermal cycles during high heat flux (HHF) tests. The test mock-ups were non-destructively tested using infrared thermography before and after the HHF tests. In this note we describe the detailed procedure used for testing macro-brush and monoblock type test mock-ups using in-house transient infrared thermography set-up. An acceptance criteria limit was defined for small scale macro-brush type of mock-ups using DTrefmax value and the surface temperature measured during the HHF tests. It is concluded that the heat transfer behavior of a plasma facing component was checked by the HHF tests followed by transient IR thermography. The acceptance criteria DTrefmax limit for a graphite macro-brush mock-up was found to be ~3°C while for a tungsten macro-brush mock-up it was ~5°C.

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Section: Macro-brush Type Mock-upmentioning

confidence: 99%

R&D on divertor plasma facing components at the Institute for Plasma Research

et al. 2015

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“…Cu and Cu based alloys have found wide and important applications in many fields, especially in electrical appliances and electronic products [1,2]. In an electronic product, a long cylinder is welded to the inner surface of a sleeve.…”

Section: Introductionmentioning

confidence: 99%

“…The tensile strength of this alloy is above 500 MPa. However, its strength will decline to below 400 MPa when the temperature is over 550 • C [2,3]. This means that the cylinder and the sleeve must be welded below this temperature.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder

et al. 2017

Metals

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Au-Ge-Ni solder was chosen for brazing of the Cu-Cr-Zr alloy cylinder and a part with a cylindrical hole (sleeve) below 550 • C. The Au based solder was first sintered on the surface of the cylinder and then brazed to the inner surface of the sleeve. The effects of the heating process, the temperature and the holding time at the temperature on the microstructure of the sintered layer on the surface of the cylinder, the brazed interfacial microstructure, and the brazed shear strength between the cylinder and the sleeve were investigated by scanning electron microscope, energy dispersive X-ray spectroscopy analysis, and tensile shear tests. By approach of side solder melt feeding and brazing under proper parameters, the voids and micro cracks due to a lack of enough solder melt feeding are greatly lessened and the brazed shear strength of 100 MPa is ensured even with large clearances around 0.01 mm.

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“…Incident heat flux measurement in terms electron beam power exposed to surface area of mock-up, extracted heat flux by coolant calorimetry and surface temperature measurement by pyrometer and IR camera, Heat-sink tube temperature measurement by thermocouples are the measurements to check the relevancy of the high heat flux tests [12,13]. Previous HHF tests were performed up to incident flux 19.5 MW/m 2 on tungsten macro-brush type of test mock-ups using electron beam facility at Plasma Materials Test Facility of Sandia National Laboratories (Albuquerque, USA) [14][15][16]. Present work elaborates newly developed high heat flux test facility (HHFTF) at IPR for testing full scale divertor targets as well as small scale test mock-ups.…”

Section: Introductionmentioning

confidence: 99%