Water and salt water absorption, hygrothermal and tribological propertires of nickel zinc ferrite magnetorheological elastomers
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Date
2018-05
Authors
Chang, Fan Ru
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Abstract
Magnetorheological Elastomers (MREs) known as new material under
development research to offer high damping capability for many applications use to replace
limitations usage of rubber as a damper. Many research studies only focused on its material
properties such as magnetorheological effect and lack of studies on mechanical properties
of its specific applications. Mechanical properties such as hardness, tribology characteristic
and salt water and water absorption with hygrothermal effect will be further studies on
wear performance of Magnetorheological Elastomers on marine equipment applications.
Isotropic, anisotropic and anisotropic with added N330 carbon black filler of Ni Zn Ferrite
Magnetorheological Elastomers (MREs) are prepared with Ni Zn Ferrite filler, Ni1 -
xZnxFe2O4 particles weight fraction of 70%. Images of Scanning Microscopy Electron
(SEM) and Energy Dispersive X-Ray Analysis (EDX) are identified with the presence of
the structure of Ni Zn Ferrite in the natural rubber matrix. In salt water and water absorption
and hygrothermal effect, an effect on the percentage of increase in weight of samples
during immersion within the period of 336 hours will be analyzed. Tribology
characteristics of these three compounds are studied by pin-on-disc machine based on the
perspective of the average specific coefficient of friction (COF), specific wear rate, and
loss of wear volume initial condition and after water and salt water immersion with
different speeds and loads applied. Wear performance of three compounds of MREs is
directly proportional to its hardness. Anisotropic Ni Zn Ferrite MREs with added carbon
black filler given highest hardness value of 90.78; least effect on salt water and water
absorption and hygrothermal effect; better wear performance with a low average specific
coefficient of friction, specific wear rate and least loss of wear volume. Therefore, it is
most suitable use for future application in a wet environment for a long period.