Processing and Application of Ceramics,
Год журнала:
2023,
Номер
17(4), С. 384 - 392
Опубликована: Янв. 1, 2023
The
development
of
high-speed
aerial
vehicles
urgently
requires
high-performance
integrated
materials
for
ablation
resistance,
thermal
insulation
and
oxidant
protection
under
high
temperature.
previously
prepared
carbon
aerogel
composites
(C/CA),
with
ultra-high
temperature
properties,
were
impregnated
SiCO
precursor
sol
pyrolysed
in
nitrogen
atmosphere
at
1200?C.
impregnation/pyrolysis
process
was
performed
once,
twice
thrice
to
obtain
three
different
C/C-SiCO
nanoporous
ceramic
composites.
Further,
TaSi2-MoSi2-borosilicate
glass
(TM-BG)
coating
or
TaSi2-MoSi2-ZrB2-borosilicate
(TMZBG)
on
the
surface
through
slurry
brushing
combined
graphite
powder
embedded
sintering
process.
By
simulating
actual
application
environment
oxygen
acetylene
flame
test,
resistance
samples
studied
their
oxidation
mechanism
analysed.
results
show
that
rate
after
200
s
1600
?C
decreases
increase
number
steps
modified
significantly
enhanced.
addition
ZrB2
improves
compatibility
between
substrates
coating,
TMZ-BG
coated
sample
has
better
resistance.
At
temperature,
borosilicate
is
a
viscous
flow
state.
Meanwhile
SiO2
generated
by
other
silicide
raw
forms
dense
layer
surface,
which
can
be
used
as
an
barrier
provide
substrates.
coating-modified
porous
are
expected
high-temperature
ablation-resistant
material
system
new
aerospace
vehicles.
ACS Nano,
Год журнала:
2024,
Номер
18(14), С. 9798 - 9822
Опубликована: Март 29, 2024
Extreme
climates
have
become
frequent
nowadays,
causing
increased
heat
stress
in
human
daily
life.
Personal
thermal
management
(PTM),
a
technology
that
controls
the
body's
microenvironment,
has
promising
strategy
to
address
stress.
While
effective
ordinary
environments,
traditional
high-performance
fibers,
such
as
ultrafine,
porous,
highly
thermally
conductive,
and
phase
change
materials,
fall
short
when
dealing
with
harsh
conditions
or
large
temperature
fluctuations.
Aerogels,
third-generation
superinsulation
material,
garnered
extensive
attention
among
researchers
for
their
applications
building
energy
conservation,
transportation,
aerospace,
attributed
extremely
low
densities
conductivity.
aerogels
historically
faced
challenges
related
weak
mechanical
strength
limited
secondary
processing
capacity,
recent
advancements
witnessed
notable
progress
development
of
wearable
PTM.
This
underscores
potential
within
serving
self-powered
smart
devices
sensors.
Review
offers
timely
overview
PTM
particular
focus
on
wearability
suitability.
Finally,
discussion
classifies
five
types
based
aerogel
function:
insulation,
heating,
cooling,
adaptive
regulation
(involving
cooling),
utilization
devices.
Gels,
Год журнала:
2024,
Номер
10(5), С. 286 - 286
Опубликована: Апрель 23, 2024
High-temperature
aerogels
have
garnered
significant
attention
as
promising
insulation
materials
in
various
industries
such
aerospace,
automotive
manufacturing,
and
beyond,
owing
to
their
remarkable
thermal
properties
coupled
with
low
density.
With
advancements
manufacturing
techniques,
the
resilience
of
has
considerable
improvements.
Notably,
polyimide-based
can
endure
temperatures
up
1000
°C,
zirconia-based
1300
silica-based
1500
alumina-based
1800
carbon-based
withstand
2500
°C.
This
paper
systematically
discusses
recent
performance
these
five
materials.
It
elaborates
on
temperature
resistance
elucidates
mechanisms.
Furthermore,
it
examines
impact
doping
elements
conductivity
consolidates
preparation
methods
aimed
at
producing
capable
withstanding
temperatures.
In
conclusion,
by
employing
judicious
composition
design
strategies,
is
anticipated
that
maximum
tolerance
surpass
thus
opening
new
avenues
for
application
extreme
environments.
