The
transition
between
transparent
and
opaque
of
as-sintered
zeolite
samples
is
employed
to
study
the
temperature
distribution
of
non-conducting
samples
during
spark
plasma
sintering
(SPS)
process
in
this
paper.
The
results
show
that
temperature
gradients
exist
in
both
radial
and
axial
directions,
which
provide
direct
evidence
of
temperature
distribution
in
the
SPS
process.
The
sample
prepared
at
1325
◦
C
is
transparent
in
the
center
and
opaque
in
the
edge,
which
suggests
that
the
temperature
of
the
center
is
higher
than
the
edge
and
the
temperature
differential
is
about
26
◦
C
by
the
thermal
analysis
model
based
on
the
experimental
data
in
ANSYS
code.
The
axial
temperature
gradient
is
also
present
in
the
as-sintered
sample
obtained
at
1315
◦
C.
The
transparent
part
of
the
upper
surface
is
larger
than
the
lower
surface,
which
illustrates
that
the
temperature
of
the
upper
surface
was
higher
than
the
lower
surface
and
the
difference
is
about
5
◦
C
parameters