Multifunctional tribometer development and performance study of CuCrZr-316L material pair for ITER application

Chen, Z.; Hillairet, J.; Turq, Viviane; Song, Yuntao; Yang, Qian; Lombard, G.; Vulliez, K.; Mollard, P.; Volpé, Robert; Bernard, Jean-Michel; Hernandez, C.; Ferlay, Fabien; Larroque, S.; Laloo, Raphaël; Bruno, V.; Hatchressian, Jean-Claude; Xu, Handong

doi:10.1016/j.triboint.2017.07.024

Cited by 11 publications

(5 citation statements)

References 22 publications

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“…Generally, weight loading [29], hydraulic loading, and spring loading [30] are the main ways to apply the load for the testing machine. The weight-loading method has a simple structure and is only suitable for small load conditions.…”

Section: Radial Force Systemmentioning

confidence: 99%

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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Coated self-lubricating spherical plain bearings (SSPBs) are a fairly key component of the space-swing mechanism. To examine the operation status and tribological properties of coated SSPBs, a tribometer with a temperature control module in a vacuum condition was developed. The tribometer was mainly composed of a fixture system, reciprocating rotational motion system, environment control system, etc. First, the tribometer was verified with the self-made hydrogenated diamond-like carbon (H-DLC) SSPBs. The sensor signals indicated that the tribometer conformed to the design specifications. Then, the influence of friction heat on the tribological properties of H-DLC SSPBs was analyzed. The results showed that friction torque and temperature increased with the overall test time. Although the temperature had reached 48 °C, the frictional heat had little effect on the H-DLC SSPBs’ lifespans. The damage mechanism of H-DLC SSPBs was dominated by abrasive wear and fatigue wear in vacuum conditions.

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Section: Radial Force Systemmentioning

confidence: 99%

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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“…The electrical performance of the Au-Ni coating was carefully investigated by measurement of the contact resistance (under direct current) between the Au-Ni-coated pin samples and the Rh-coated 316L plates (thickness: ~4.2 µm, surface roughness Sa: 1.9 µm) on a dedicated testbed [39]. The pin and plate samples can accurately represent the louver of the RF contact and the RF conductor to which the RF contact is connected, respectively.…”

Section: Effects Of Operation Temperature Vacuum and Normal Contact F...mentioning

confidence: 99%

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

et al. 2018

Self Cite

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Radio-frequency (RF) contacts-which are an example of electrical contacts-are commonly employed on accelerators and nuclear fusion experimental devices. RF contacts with a current load of 2 kA for steady-state operation were designed for application to the International Thermonuclear Experimental Reactor (ITER) device. In contrast to the typical working conditions of general commercial electrical contacts, those of RF contacts employed on fusion devices include high vacuum, high temperature, and neutron radiation. CuCrZr is currently of interest as a base material for the manufacture of louvers of RF contacts, which has excellent thermal and electrical properties and has low creep rate at 250 °C. In this study, a hard Au coating (Au-Ni) was electroplated on CuCrZr samples and the samples were then subjected to thermal aging treatment at 250 °C for 500 h in order to simulate the vacuum-commissioning process of the ITER. The effects of thermal aging on the hardness, elastic modulus, crystallite size, and compositions of the coating were investigated via microstructural and mechanical characterizations of the coating material. Metal atom migration in different coating layers during thermal aging was characterized and evaluated via scanning electron microscopy/energy dispersive X-ray spectroscopy observations of the cross-sectional surfaces, and the obtained results could be used to directly select the coating thickness for the final RF contact component. The contact resistance-an important parameter of the RF contact-was measured in a dedicated testbed built to simulate fusion reactor conditions between CuCrZr pins and stainless steel plates coated with Au-Ni and Rh, respectively.

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“…The coating adherence was evaluated using a CSEM® Micro-Scratch Tester (Rockwell C diamond indenter, tip radius 200 µm) and the effects of thermal ageing were studied. Electrical and tribological tests were performed based on the thermally aged samples on a dedicated tribometer in which ITER RF sliding contact conditions can be mimicked [6]. A 3D optical profiler (SENSOFAR) was used to analyze the worn surfaces after the tribological test.…”

Section: Materials and Characterization Techniquesmentioning

confidence: 99%

Au-Ni and Rh Electroplated Coatings Evaluation for ITER Ion Cyclotron Resonance Heating Radio-Frequency Sliding Contacts

Chen¹,

Hillairet²,

Turq

et al. 2018

MSF

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Within the large scale fusion experimental device ITER, Ion Cyclotron Resonance Heating (ICRH) system is one of the three heating systems which will supply total heating power of 20 MW (40-55 MHz) up to one hour operation. Radio-Frequency (RF) contacts are integrated within the antennas for assembly and operation considerations, which will face extremely harsh service conditions, including neutron irradiation, heavy electrical loads (RF current reaches up to 2 kA with a linear current density of 4.8 kA/m), high thermal loads and also long-duration vacuum baking at 250°C before each experimental plasma campaign. CuCrZr and 316L steel have been shown to be proper base candidate materials for ITER RF contact louvers and conductors respectively. However, in order to limit the wear and the diffusion phenomena at the RF contact as well as to reduce the contact resistance, functional protective layers should be developed. The aim of this work is to investigate Au-Ni and Rh functional layers, electroplated on CuCrZr and 316L respectively. The efficiency of the Au-Ni/Rh coated pairs was evaluated through thermal ageing diffusion tests, using EDS cross-section mapping and XRD techniques. Wear and electrical contact performances of the Au-Ni/Rh original and thermally aged pairs have also been deeply studied on a dedicated tribometer operated at ITER relevant conditions.

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Multifunctional tribometer development and performance study of CuCrZr-316L material pair for ITER application

Cited by 11 publications

References 22 publications

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

Au-Ni and Rh Electroplated Coatings Evaluation for ITER Ion Cyclotron Resonance Heating Radio-Frequency Sliding Contacts

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