Carbon material spare parts
Generalities
ROSEAL
S.A. produces bushes and rods made
of carbon materials, which are used for pieces
which work in special conditions, such as: dry or mixed
friction, in contact with corrosive media, high mechanical stresses.
Carbon materials are used for these applications because of the following properties:
high mechanical strength, low wear due to selflubrication, very
good corrosion resistance, low density,
dimensional stability.
The main mechanical applications
for carbon materials are: sealing rings for
mechanical seals, sealing rings for feeder
heads, rings for radial contact or gap seals,
rings for radial or axial bearings, vanes for
rotary compressors and pumps, gas compressor packing.
Resin
bonded carbon materials, grades B1, B4
These materials are used in big series
and mass productions such as mechanical seals
for automotive cooling pumps, because of their pressing
to size ability, which means that only the sliding
surfaces need machining. Also half
made pieces such as rings, rods, bushes can be
produced, which will be machined to the final dimensions. The using
area of resin bonded carbon materials is more limited
that than of the baked and impregnated ones, because of
their lower mechanical and corrosion resistant
properties determinate by the resin used as a binder.
Baked and impregnated carbon materials, grade
B14
Because that half made baked pieces
are porous, they must be impregnated for
sealing application. The density of the impregnation is diminished
with it's depth. For this reason sealing rings are
impregnated after their machining to the close final dimensions.
Thus higher density and lower permeability
is assured. Sealing rings for mechanical seals made of grade
B14 carbon materials are permeability tested with compressed air
or nitrogen.
Note
Sealing rings for mechanical seals made of carbon materials are
high precision machined, so they must be manipulated with care. Compared
with metals, carbon materials are more fragile for which shocks and vibrations
must be avoided.