"Extensive systematic tests have shown that the inorganic
filler and friction material in the
lining compound in particular are responsible
for changes to the lining damping
during usage in the double clutch-specific
slippage phases. The mode of action
in the friction contact can be described
using a two-phase model.
Stage 1 – enrichment of inorganic
substances in the friction layer:
In many similar clutch slipping phases with
low friction energy, but with average, specific
frictional power, organic components
of the lining compound are partially, thermally
broken down on the lining surface.
The associated lining wear is not high
enough to renew the friction surface sufficiently.
As a result, an increasing numbers
of inorganic components build up in the friction
layer close to the surface.
Phase 2 – enrichment of casting wear
particles in the friction layer:
The increased proportion of inorganic
components in the friction layer leads to
increased wear of the contact material,
comprised of cast iron or steel. As the
surface of the friction lining is not renewed
due to the comparatively low thermal
stress, the metallic wear particles are enriched
in the friction layer. The result of the
layer being enriched leads to a negative
change in the frictional coefficient gradient."