Abstract
In this paper, the effect of nano zirconia particles on damping characteristics of polycarbonate composites was investigated experimentally. The nano particles were added to polycarbonate matrix with five different weight percentage (wt %). Polycarbonate Nanocomposites filled with pristine and modified Zirconium dioxide were prepared by simple melt compounding. All samples were prepared by an injection molding process. The samples were studied before and after damage. Damage process was done with high velocity impact. The half-power bandwidth method was used to experimentally estimate the damping ratio. The experiments were designed based on an impulse actuator signal generated by the shaker, and the responses were recorded using accelerometer sensors. The results of experiments showed that the damping properties of the composite were increased by adding nanoparticles to 3 wt% and decreased gently for samples with the upper content of nanoparticles. Transmission electron microscopy (TEM) pictures were used to investigate the distribution of nano zirconia on the polycarbonate matrix and showed a homogeneous mixture of nanocomposites and strong bonding between zirconia and polycarbonate that increased damping properties and decreased vibration. Finally, the experimental modal analysis test was done after high-velocity impact damage process to investigate the effect of defection on the nano polycarbonate composites. The results showed a great decline in vibration and an increase of damping properties.
Highlights
Polycarbonate (PC)is a kind of amorphous thermoplastic polymer that has been widely used in various industries such as electronics, automotive, aircraft, houseware
In recent years, increasing demand for all-ceramic restorations led to the development of ceramic materials with optimized mechanical properties, such as densely sintered aluminum oxide and zirconium dioxide (Zirconia) ceramics [6, 9, 14, 23]
Zirconia particles are frequently employed as the toughening agent for other ceramic composites, and this zirconia toughened ceramics have received great attention in the last two decades
Summary
: 1) The nanoparticles with four different weight percentages (1-5 wt. %) have added to the PC matrix. The TEM micrographs process was as follows: the materials have sliced with the thickness of 15nm at a temperature of -120°C (cooled down with liquid Nitrogen) using LeicaEM UC7 microtome (Germany). The response was measured at 12 points It can be excited by using an accelerometer with the 0.5g weight attached to the plate and the fixture. Both the excitation and response signals were sent to the Dual-Channel FFT Analyzer. According to this plot, it obtained that, the damping ratio has increased with increasing the nano ZrO2 to 3 wt. It observed that the damping ratio decreased significantly with increasing the nanoparticles by more than 3 wt. The damping ratio has been calculated by Eqs. 1-7
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