/div>
as silicone rubbe r decomposition effect. Two fractions of
bigger pores (~5 micrometers and ~20 micrometers)
were created as an effect of agglomeration.
The presence of long fibers was not so important for
this process. The aluminosilicate fibers survived the ce-
ramization process and they stayed present in the cera-
mized bodies. The Kevlar fibers disappeared during fir-
ing but it has no significant influence for the microstruc-
ture of ceramized bodies, most probably due to relatively
low viscosity of mixture of fluxing agent and ceramiza-
tion products.
Figure 9 summarized strength of ceramized bodies
Z. PĘDZICH ET AL.
Copyright © 2013 SciRes. MSCE
47
Figure 9. Plots of breaking force dependence vs. fibers con-
tent for mineral (LAP) and Kevlar (KEV) fibers. Samples
were ceramized at 1000˚C.
investigations. Differences observed between elaborated
samples were not significant. One can observe a slight
increase of strength for composites containing 5 phr ad-
ditions of both types of fibers. Such results were proba-
bly the effect of microstructure uniformization at high
temperatures due to flowing of the fluxing agent.
4. Summary
Performed experiment confirms the possibility of rein-
forcing of silicone rubber-basing composites containing
wollastonite particles with addition of long fibers.
The performance of specially oriented microstructures
was successful and it was established that addition of
small (5 - 10 phr) amounts of aluminosilicate fibers sig-
nificantly in creased composite tensile strength.
The Kevlar fibers have no good adhesion to the others
material compounds and only the minimal used level of
fibers gave property improvement.
All investigated materials showed good properties af-
ter firing. Ceramized bodies were tight, uniform and
strong enough to be used in fire-protecting application.
Performed test recommended composites containing
aluminosilicate fibers as more perspective for mentioned
application.
5. Acknowledgements
The work was financially supported by the European
Union within a framework of National Coherence Strat-
egy under Innovative Economy Operating Programme
(grant no. POIG.01.03.01-00-067/08) and by the Polish
State Ministry for Science and High Education (AGH
11.11.160.364).
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