Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 26, 2024
Air
foil
bearings
(AFB)
working
on
hydrodynamic
lubrication
are
exposed
to
more
wear
during
start-stop
condition
of
motion.
To
reduce
the
and
improve
damping
properties
top
foil,
influence
combined
effect
silicon-graphite
coating
bottom
side
with
plain,
texture
polyimide
(PI)
coated
surface
stainless
steel
(SS304)
was
analysed
for
low
speeds.
The
SS304
is
taken
as
a
material
which
mixture
applied
at
all
specimens.
other
sliding
contact,
three
different
surfaces
such
textured
PI
used
in
this
study.
Wear
behaviour
using
pin-on-disc
test
per
ASTM
standard
results
compared.
average
loss
50%
lesser
specimen
than
plain
specimen.
acted
damper
provide
better
hardness.
X-ray
diffraction
(XRD),
Fourier
Transform
Infrared
(FTIR)
Spectroscopy,
optical
microscopy
scanning
electron
(SEM)
study
were
carried
out
understand
crystalline
phase,
functional
groups,
track,
region
respectively.
It
observed
from
FTIR
that
C
=
O
N-H
bonds
around
1729
3137
cm
−1
wavelength.
XRD
reveals
shows
austenite,
martensite
hexagonal
structures.
SEM
images
show
well
adhered
structure
SS304.
combination
gives
resistance
resistance.
Journal of Materials Research and Technology,
Год журнала:
2024,
Номер
30, С. 88 - 100
Опубликована: Март 11, 2024
This
study
explores
the
phase
constitution,
thermal
behavior,
magnetic
characteristics,
and
mechanical
properties
of
FeCoNiCrCux
high-entropy
alloys
(HEAs)
produced
via
powder
metallurgy,
focusing
on
varying
copper
ratios
(0–20%).
The
investigation
seeks
to
understand
how
introduction
influences
composition
FeCoNiCr
HEAs,
particularly
regarding
changes
in
structure
behavior.
constitution
was
analyzed
using
field
emission
scanning
electron
microscopy
(SEM)
X-ray
diffraction
(XRD).
Thermal
expansion
differential
calorimetry
(DSC)
were
employed
while
vibrating
sample
magnetometers
(VSM)
utilized
assess
properties.
Mechanical
evaluated
through
hardness
testing.
analysis
reveals
a
shift
from
single-phase
FCC
dual-phase
configuration
comprising
copper-rich
phases
as
content
increases.
characterized,
demonstrating
alloy's
behavior
under
conditions.
tests
showed
decrease
with
increasing
content.
contributes
understanding
addition
affects
properties,
strength
HEAs.
observed
offer
insights
for
tailoring
HEAs
specific
applications.
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Март 2, 2024
Abstract
Deposition
of
high
entropy
alloy
FeCoNiMnCu
on
SS-304
was
carried
out
by
microwave
energy
for
application
in
“solid
oxide
fuel-cell
(SOFC)
interconnects”.
The
ball-milling
has
been
performed
taking
“Fe,
Co,
Ni,
Mn,
and
Cu”
equal
20
wt.
%
before
deposited
substrate.
steel
with
20%
Fe
Co
Ni
Mn
Cu
(HEA)
exposed
to
thermal-exposure
the
air
up
10
weeks
at
800
°C.
uniform
cladding
distribution
HEA
particles
can
be
apparently
observed
substrate
utilizing
Scanning
Electron
Microscope
(SEM),
Optical
microscopy
analysis.
Homogeneity
interfacial
layer
evident
employing
(SEM)
characterization.
Results
have
indicated
that
after
thermal
exposure
ten
°C,
a
“protective
Cr
2
O
3
layer”,
“high-entropy
spinel
coating”
(Fe,
Cu)
4
formed.
During
cladding,
emergence
harder-phases
contributed
raised
hardness.
wear
behavior
coating
significantly
enhanced
due
strengthened
resistance
hardness
coatings.
Findings
exhibited
formation
phase
is
potential
material
“SOFC
interconnects”
applications.
Moreover,
SS304
composition
Fe,
demonstrated
remarkable
stability
under
expansion
studies.
As
findings
revealed
composite
efficiently
withstand
significant
variations
volume
when
subjected
elevated
temperatures
prolonged
period
time,
thus,
exhibiting
its
superior
SOFC-interconnect
Furthermore,
SEM
images
surface,
surface
hardness,
tribocorrosion
coated
identify
effect
steel-substrate.
Journal of Materials Research and Technology,
Год журнала:
2024,
Номер
31, С. 6 - 25
Опубликована: Июнь 2, 2024
The
growing
challenges
of
reducing
exhaust
emissions
and
improved
fuel
economy
has
triggered
automotive
engineers
to
design
manufacture
engine
parts
with
superior
mechanical
properties
dimensional
accuracies.
Valve
guides
are
cylindrical
structures
supporting
inlet
valve
stems
during
operation.
Conventionally
made
grey
cast
iron
material,
guide
suffers
from
severe
wear
losses
leading
loss
increased
due
improper
stem
seating.
Here,
the
synthesis
a
novel
ferrous
powder
metallurgy
composite
is
presented
characteristics
have
been
studied
at
varying
loads
30
N,
40
N
50
sliding
speeds
0.5
m/s,
1
m/s
2
under
lubricated
conditions.
samples
undergone
nitriding
heat
treatment
1150
°C
improve
surface
hardness
700
Hv.
shown
negative
rates
high
capillary
action
lubricating
oil
exhibited
stable
friction
coefficient
values.
This
attributed
formation
hard
phases
Fe2N,
Fe3N,
Fe4N
Fe(Mn)3C
twinning-induced
plastic
compounds
like
(Fe24Mn)
0.08
as
evident
XRD
analysis.
morphological
analysis
worn
out
was
done
SEM
Coupled
EDS
it
showed
micro-cutting,
Ploughing,
delamination
main
phenomenon.
Composite Interfaces,
Год журнала:
2024,
Номер
31(10), С. 1173 - 1197
Опубликована: Март 18, 2024
The
present
study
investigated
the
effect
of
incorporating
Yttria-Stabilized
Zirconia
(YSZ)
and
copper
(Cu)
in
development
Titanium-Based
Metal
Matrix
Composites
(TMCs)
using
Friction
Stir
Processing
(FSP)
technique.
macrostructure
TMCs,
after
adding
5%
YSZ
2%
Cu,
displayed
a
defect-free,
crack-free,
porosity-free
surface,
indicating
precision
FSP
method.
Microstructure
analysis
revealed
uniform
distribution
reinforcement
particles
proper
dispersion
grains,
key
for
enhancing
mechanical
properties.
interfacial
bonding
between
titanium
was
exceptionally
strong,
devoid
cracks
porosity,
attributed
to
additive's
role.
increase
number
grains
per
square
inch
Ti/5%
YSZ/2%
Cu
composite
(1176.26
at
500×)
signified
finer
grain
structure,
contributing
remarkable
48.04%
improvement
tensile
strength
compared
pure
titanium.
strong
are
driving
forces
behind
46.34%
increased
hardness.
Additionally,
wear
resistance
improved
by
approximately
76.66%,
vital
characteristic
applications
facing
abrasive
conditions.
corrosion
testing
demonstrated
an
8.33%
enhancement
with
composite.
Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 7, 2025
The
increasing
demand
for
conventional
polymeric
composites
has
drawn
global
concern
towards
environmental
pollution,
disposal
and
the
high
cost
of
traditional
motivated
adoption
circular
economy.
Biofillers
are
recognized
as
a
valuable
material
development
sustainable
biocomposites.
work
studied
tribological
behavior
neat
banana
peel
powder-reinforced
polylactic
acid-based
biocomposites
developed
by
employing
3D
printing
technique.
Two
body
dry
sliding
wear
tests
were
performed
under
05
(five)
different
loads
speed
conditions.
Investigations
specific
rate,
surface
roughness,
coefficient
friction
performed,
well
morphological
analyses
worn-out
surface.
performance
shown
their
dependency
on
test
conditions
fraction
reinforcements.
composite
reinforced
with
15
wt.
%
power
obtained
minimum
rate
0.00028,
0.00038,
0.00057
(mm
3
/N-m)
10,
15,
20
(N),
respectively,
whereas
reinforcement
resulted
in
0.00080
0.00086
at
25
N
30
N.
A
similar
observation
speeds
observed
that
powder
0.000239,
0.000382,
0.00040,
0.00063,
0.001577
given
1,
1.5,
2,
2.5
(m/s),
respectively.
was
ranges
0.045–0.31
0.005–0.25
considered
speeds,
demonstrated
potential
applications
is
pivotal
from
techno-eco
points
view.
