Min Xian Shi

Effect of Film Thickness on Structure and Property of Pb(Zr0.53Ti0.47)O3 Thin Film

Pb(Zr0.53Ti0.47)O3 thin films with thickness of 120nm, 190nm, 310nm, 440nm and 630nm were deposited on Pt/Ti/SiO2/Si substrates by sol-gel process through repeating spining process 2 times, 4 times, 6 times, 8 times and 10 times respectively. The structures of PZT films were investigated by SEM and XRD analysis. The ferroelectric hysteresis loops were recorded by Radiant Precision Workstation and dielectric properties were measured using an Agilent HP4294A impedance analyzer. X-ray diffraction indicated that with the film thickness increasing, the diffraction intensity increased. The thickness of PZT film had great effect on ferroelectric and dielectric properties. Conclusively when the film thickness was about 310nm, the PZT thin films possessed better ferroelectric and dielectric properties.

Preparation and Curing Behavior of Silicone-Modified Phenolic Resin

Silicone-modified phenolic resin was prepared by synthesizing phenol, formaldehyde and phenyltrimethoxysilane, which were supported by Fourier Transform Infrared Spectoscopy (FT-IR). The carbon residual rate of Silicone-modified phenolic resin increased steeply when the silicone modifier was added increasing from 5% to 15%(on resin base) which was tested in an air atmosphere,from room temperature to 800 °C by Thermogravimetric Analysis (TG) ,modified resin of 15% silicone modifier had the highest carbon residue rate. Curing process of silicone-modified phenolic resin determined by Differential Scanning Calorimetry (DSC) was: 80°C/4h+100°C/2h+120°C/2h+160°C/3h+180°C/2h. Curing Kinetic Study on silicone-modified phenolic resin was made to understand the curing process better.

Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams

In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.

Effects of Silane Coupling Agent Treatment on Properties of PMN/EP Composites

The PMN/EP composites were prepared by resin casting method from PMN powder pretreated with silane coupling agent KH-550. The microstructure of the PMN/EP composite was observed by SEM, the damping property and dielectric property of the composite were investigated by dynamic mechanical analyzer and impedance analyzer respectively. In the composite prepared with PMN powder pretreated by 1.5% silane coupling agent, much epoxy resin fragment is attached in the surface of PMN particles. When the silane coupling agent concentration is 1.5%, the composite shows the best damping property. Dielectric analyses suggest that the dielectric constant of the PMN/EP composite decreases with the increase of silane coupling agent content, however the dielectric loss increases with the increase of silane coupling agent content.

Preparation and Characterization of Polyaniline/PMN Composite by In Situ Polymerization Method

The PANI/PMN composite was prepared by one-step in-situ polymerization method and was characterized via FT-IR, XRD, SEM and TG. The results indicate that the best reaction conditions of in-situ polymerization are 0°C/24h.The PMN powder are entirely coated with PANI, when composite contains more than 60% PANI by volume. The steric hindrance effect of PMN powder decreases the crystallization degree of PANI which polymerizes on the surface of PMN powder in the process of in-situ polymerization. The main weight loss occurring between 300 and 480°C corresponds to the degradation of the PANI polymer chain.

Researching of the Active and the Passive Damping of Syntactic Foam and Piezoelectric Composite

This paper mainly states that under the PID program control, syntactic foam cantilever beam and piezoelectric composite cantilever beam which are studied with the momentary force and the alternating force signal, in the effective of active damping. The vibration stopping time changes under the momentary force and the amplitude changes under the alternating force signal. Comparing under the same initial amplitude, the amplitude changes of syntactic foam cantilever beam and piezoelectric composite cantilever beam under the active damping.

Computer Simulation Model for Multi-Size Spherical Particles Reinforced Composite Materials

In this Research a Method for Computer Simulation Model of Composite Materials, which Are Reinforced by Multi-Size Particles, Is Introduced. All Particles Are Embedded in the Matrix Randomly. Composite of Different Particle Volume Fraction Were Simulated and Visualized. Statistic Results Shows that the Particles Disperse Distribution Are Uniform which Could Be Used in the Further Study of Composite.

Several Models for Piezoelectric Composites

This paper introduces several models for different piezoelectric composites with the modeling process and mechanism. In order to characterize the uniformity and stability, the volume density of particles and fibers changed with volume is studied. The models generated by ANSYS finite analysis are showed, which the codes are produced by the models.

Analysis of Active Vibration Control in Damping Cantilever Beam by ANSYS with Material Properties

It is possible to model transient dynamic analysis of different composite foam cantilever beams by ANSYS/Multiphysics. By the piezoelectric materials positive piezoelectric effect and negative piezoelectric effect, the active vibration control of damping cantilever beam has achieved through the APDL program. The analysis of the results indicates when the control ratio K kept constant, the vibration stop times and the material damping ratio were closely connected.

Computer Simulation Model for Spherical Particle Filled Composite Materials

This paper introduced a computer simulation model for composite materials which was reinforced by spherical particles. We introduced its algorithm and visualize the model with different particle volume fraction. In order to evaluate the uniformity of the particle distribution, we estimated Particle Center Density and standard deviation of minimal sphere distance.