Lubricants,
Год журнала:
2024,
Номер
12(12), С. 409 - 409
Опубликована: Ноя. 24, 2024
The
electromagnetic
railgun,
a
novel
kinetic
energy
weapon,
has
found
utility
in
military
operations
due
to
its
enhanced
safety
features
and
superior
precision.
This
study
investigates
the
enhancement
of
wear
resistance
CuCrZr
rails
through
plasma
cladding
CuCrZr-CeO2
coatings
with
varying
Cerium
dioxide
(CeO2)
content.
To
enhance
track,
CeO2
content
was
investigated.
impact
(0%,
0.1%,
0.15%,
0.2%,
0.25%,
0.3%)
on
microstructure,
phase
composition,
mechanical
properties
coating
assessed
using
scanning
electron
microscopy
(SEM),
X-ray
diffraction
(XRD),
EDS(Energy
Dispersive
Spectrometer)
surface
scanning,
friction
tests,
hardness
analysis.
findings
indicate
that
0.15%
leads
transition
coating’s
microstructure
from
columnar
equiaxed
crystals,
densest
grain
structure.
Beyond
CeO2,
pore
defects
increase,
compromising
properties.
containing
exhibits
optimal
performance,
75.3,
representing
5.31%
increase
compared
CeO2-free
coatings.
Under
10
N
load,
coefficient
decreases
by
approximately
17.9%
about
0.64.
Moreover,
minimum
mass
is
reduced
44.7%
3.87
mg.
aforementioned
research
hold
immense
importance
extending
lifespan
railgun
improving
operational
efficiency.
Lubricants,
Год журнала:
2024,
Номер
12(6), С. 227 - 227
Опубликована: Июнь 19, 2024
In
order
to
improve
the
wear
resistance
of
45
steel,
in
this
study,
WC/Ni60
composite
coatings
with
different
CeO2
additions
(0,
1,
2,
and
3
wt%)
were
prepared
on
steel
by
laser
cladding
technique;
experimental
analysis
was
carried
out
means
scanning
electron
microscopy
(SEM),
energy-dispersive
spectroscopy
(EDS),
X-ray
diffraction
(XRD),
a
Vickers
hardness
tester,
friction
tester.
The
results
show
that
had
little
effect
phase
composition
coatings;
however,
increase
content,
played
key
role
refining
grains
coating,
thus
reducing
generation
cracks.
addition,
could
effectively
strengthen
internal
structure
coating
its
microhardness
resistance.
Particularly
noteworthy
is
observed
reduction
both
coefficient
mass
loss
when
addition
reached
2%.
This
suggests
an
enhancement
tribological
performance
at
concentration.
Langmuir,
Год журнала:
2024,
Номер
40(32), С. 16771 - 16782
Опубликована: Июль 31, 2024
Superhydrophobic
surfaces
have
received
widespread
attention
for
their
unique
hydrophobicity
in
metal
corrosion
protection.
However,
the
shortcomings
of
mechanical
stability
and
long-term
resistance
limit
practical
application.
In
this
work,
we
designed
fabricated
an
anticorrosive
friction
reducing
Ni-P/CeO
Al20V20Cr20Nb(40-x)Mox
Refractory
High
Entropy
Alloys
(RHEAs)
coatings
were
applied
to
Ti6Al4V
surfaces
via
laser
cladding.
These
coatings,
primarily
in
a
single
BCC
phase
with
dendritic
microstructures,
demonstrated
varied
wear
resistance.
Notably,
the
Al20V20Cr20Nb10Mo30
exhibited
highest
resistance,
achieving
rate
reduction
of
98.35%
and
99.28%
compared
uncoated
Al20V20Cr20Nb30Mo10
coating,
respectively.
This
superior
performance
is
attributed
formation
dense
oxide
film
beneficial
presence
rod-like
Al2(MoO4)3
Cr2(MoO4)3
oxides,
which
enhance
mechanical
clamping
at
surface.
The
study
highlights
critical
role
rapid
600℃
enhancing
high-temperature
resistance
Ti6Al4V,
offering
insights
into
tribological
behaviour
RHEA
under
extreme
conditions.
