7 research outputs found
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The potential of Ti3C2Tx nano-sheets (MXenes) for nanoscale solid lubrication revealed by friction force microscopy
TiCT nano-sheets (MXenes) are an emerging class of
two-dimensional materials with outstanding potential to be employed in energy
storage, catalysis, and triboelectric applications, on length scales ranging
from the nano- to macroscopic. Despite rapidly accelerating interest in this
new class of materials, their nanoscale frictional properties and in
particular, their potential for solid lubrication on the nanoscale, have not
been explored in detail yet. In this short communication, we present the first
results on the nanoscale frictional characteristics of MXenes, in the form of a
friction map obtained on an isolated TiCT nano-sheet deposited on a
silicon dioxide substrate via friction force microscopy. Our experiments reveal
that few-layer TiCT nano-sheets indeed act as solid lubricants on
the nanoscale, reducing friction on the silicon dioxide substrates, although
not as effectively as few-layer graphene. The results reported here pave the
way for further studies focusing on nanoscale solid lubrication achieved by
TiCT (MXene) nano-sheets
Fabrication and characterization of tungsten and graphite based PFC for divertor target elements of ITER like tokamak application
The development of the fabrication technology of macro-brush configuration of tungsten (W) and carbon
(graphite and CFC) plasma facing components (PFCs) for ITER like tokamak application is presented. The fabrication of qualified joint of PFC is a requirement for fusion tokamak. Vacuum brazing method has been employed for joining of W/CuCrZr and C/CuCrZr. Oxygen free high conductivity (OFHC) copper casting onWtiles was performed followed by machining, polishing and ultrasonic cleaning of the samples
prior to vacuum brazing. The W/CuCrZr and graphite/CuCrZr based test mockups were vacuum brazed using silver free alloys. The mechanical shear and tensile strengths were evaluated for the W/CuCrZr and graphite/CuCrZr brazed joint samples. The micro-structural examination of the joints showed smooth interface. The details of fabrication and characterization procedure for macro-brush tungsten and carbon based PFC test mockups are presented
Pre-qualification of brazed plasma facing components of divertor target elements for ITER like tokamak application
Qualification of tungsten (W) and graphite (C) based brazed plasma facing components (PFCs) is an important R&D area in fusion research. Pre-qualification tests for brazed joints between W–CuCrZr and C–CuCrZr using NDT (IR thermography and ultrasonic test) and thermal fatigue test are attempted. Mockups having good quality brazed joints of W and C based PFCs were identified using NDT. Subsequently,
thermal fatigue test was performed on the identified mockups. All brazed tiles ofWbased PFC mockups could withstand thermal fatigue test, however, few tiles of C based PFC mockup were found detached. Thermal analyses of mockups are performed using finite element analysis (ANSYS) software to simulate the thermal hydraulic condition with 10MW/m2 uniform heat flux. Details about experimental and
computational work are presented here