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| Plasma
centrifugal surfacing |
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The plasma centrifugal surfacing (PCS) is a very
new and promising technology. This technology is developed
recently and, in fact, is unknown on the Western market
yet. Indeed, we already use the PCS in industry to
protect the inner faces of liner-type details with
high grade layers against wear, corrosion and friction.
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The idea of the PCs technology is so simple
as genius (see figure). However, the years of scientific,
engineer and design affords were spent to bring the
PCS to the level of an industrial application. |
| The filler powder is fed into the liner.
With high-speed rotation of the liner the powder is
distributed even on the liner inner surface under the
influence of the centrifugal force. One or several plasma
torches melt powder, creating so-called ring molten
pool. Moving forward with the torch (torches) the ring
pool constantly involves new portions of a powder into
the melting and leaves behind solidifying layer fused
to the liner face. |
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The PCS special features define its unique advantages:
- high productivity, more than 20 kg/h;
- practical absence of filler powder looses;
- minimum tolerances for further mechanical processing;
- simplicity of using.
The required electric power is lower for 30-50% in
comparison with the induction centrifugal surfacing.
Additive powders on Fe-, Ni-, Co- and Cu-base as well
as composite materials are selected or others are
used to create necessary plasma conditions and shielding
stream.
The layer, cladded with the PCS, is homogeneous and
forms a metallurgical bond with the base material.
The layers 1-3 mm thick can be produced rapidly in
a single pass. The maximum dilution (to say simple:
the content of the base material in the cladded layer)
is not more than 3%.
Typical applications of the PCS are liners of the
slush and other pumps; plain bearings, cylinder sleeves
for automobile engines and others.
Our PCS equipment allows to produce coats for inner
faces with the diameters from 60 up to 300 mm and
overall length up to 1300 mm and more. The PCS equipment
can be performed as a component part to a common turning
lathe or as a separate complete installation.
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