Powder Metallurgy,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 20, 2025
This
study
investigates
the
correlation
between
microstructural
evolution
and
thermal
conductivity
in
additively
manufactured
CoCrNi
medium-entropy
alloy
(MEA).
Specifically,
of
as-built
MEA
was
compared
with
that
post-processed
subjected
to
hot
isostatic
pressing
(HIP).
HIP
treatment
used
reduce
defects
such
as
pores
dislocations.
The
measured
HIP-processed
exhibited
higher
values
∼12.24
W/m·K
∼3.28
at
room
temperature
deep
cryogenic
temperatures
(300
K
20
K),
(∼8.85
∼2.46
for
300
K).
improvement
is
attributed
reduced
electron
scattering
caused
by
fewer
lattice
after
post-processing.
These
findings
emphasize
fundamental
relationship
properties
both
MEAs
exceptional
conductivity.
Energies,
Год журнала:
2025,
Номер
18(6), С. 1349 - 1349
Опубликована: Март 10, 2025
The
research
on
the
thermal
insulation
performance
of
experimental
systems
in
liquid
helium
temperature
range
is
relatively
scarce.
This
paper
presents
theoretical
design
and
establishment
a
storage
system
for
research,
consisting
Dewar,
daily
boil-off
rate
test
subsystem,
recovery
subsystem.
passive
structure
consisted
multilayer
(MLI)
with
hollow
glass
microspheres
serving
as
spacers.
Based
self-built
data
acquisition,
experiments
were
conducted
to
investigate
characteristics
an
system.
A
analysis
Dewar
was
conducted,
resulting
derivation
expression
heat
leak
Dewar.
indicates
that
evaporation
capacity
from
significantly
affected
by
neck
tube.
overall
relative
error
between
simulated
distribution
layer
14.3%,
maximum
22.3%.
had
average
14.4%,
leakage
7.5
W,
flux
2.254
W/m2,
while
effective
conductivity
MLI
determined
be
2.887
×
10−4
W/(m·K).
Furthermore,
apparent
different
layers
fluctuated
increasing
temperature,
ranging
5.342
W/(m·K)
minimum
1.721
Polymers,
Год журнала:
2025,
Номер
17(6), С. 729 - 729
Опубликована: Март 10, 2025
This
study
investigates
the
effects
of
microencapsulated
phase-change
materials
(PCMs)
on
density
and
thermal
conductivity
rigid
polyurethane
(PU)
foams,
alongside
their
mechanical
properties.
Introducing
PCMs
into
foam
composition
results
in
increased
viscosity,
complicating
mixing
polyol
isocyanate
components.
viscosity
increase
can
slow
foaming
rate
subsequently
raise
density,
as
observed
both
poured
sprayed
PU
foams
containing
5%
10%
PCM,
leading
to
increases
up
9%.
Despite
these
slight
changes,
remained
relatively
stable
due
preservation
foam’s
closed-cell
structure.
The
evaluation
revealed
a
decrease
compressive
tensile
strength
with
higher
PCM
content
attributed
defects
arising
cellular
architecture.
However,
adhesive
aluminum
substrates
improved,
particularly
possibly
more
consistent
structure
during
slower
process.
Differential
scanning
calorimetry
dynamic
analysis
indicated
that
incorporation
glass
transition
temperature
affected
research
underscores
potential
enhance
functionality
while
needing
careful
consideration
concentration
avoid
compromising
structural
integrity.
Safety,
Год журнала:
2025,
Номер
11(1), С. 27 - 27
Опубликована: Март 11, 2025
The
development
of
liquid
hydrogen
storage
systems
is
a
key
aspect
to
enable
future
clean
air
transportation.
However,
safety
analysis
research
for
such
still
limited
and
hindered
by
the
experience
with
in
aviation.
This
paper
presents
outcomes
preliminary
assessment
applied
this
new
type
system,
accounting
hazards
hydrogen.
methodology
developed
based
on
hazard
identification
frequency
evaluation
across
all
system
features
identify
most
critical
concerns.
Based
assessment,
set
recommendations
concerning
different
subsystems
proposed,
identifying
scopes
necessary
mitigation
actions
various
domains.
presented
approach
has
been
proven
be
suitable
essential
despite
novelty
technology
providing
systematic
design
at
relatively
early
stage.
Powder Metallurgy,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 20, 2025
This
study
investigates
the
correlation
between
microstructural
evolution
and
thermal
conductivity
in
additively
manufactured
CoCrNi
medium-entropy
alloy
(MEA).
Specifically,
of
as-built
MEA
was
compared
with
that
post-processed
subjected
to
hot
isostatic
pressing
(HIP).
HIP
treatment
used
reduce
defects
such
as
pores
dislocations.
The
measured
HIP-processed
exhibited
higher
values
∼12.24
W/m·K
∼3.28
at
room
temperature
deep
cryogenic
temperatures
(300
K
20
K),
(∼8.85
∼2.46
for
300
K).
improvement
is
attributed
reduced
electron
scattering
caused
by
fewer
lattice
after
post-processing.
These
findings
emphasize
fundamental
relationship
properties
both
MEAs
exceptional
conductivity.
