Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Polyester

Preparation of Lead Free Piezoelectric Composite Based on Polyester Resin and (LKNN6-0.5%CeO2) Ceramic Particles

Fadhil A. Chyad; Saad B.H. Farid; Hamza M. Kamal

Engineering and Technology Journal, 2016, Volume 34, Issue 13, Pages 2464-2471

For the sake of guarding the environment from the vital problems that results from the toxic effects of lead components, lead free (LKNN6-0.5%CeO2/polyester) piezoelectric composite are prepared in this work using cold press technique. Firstly, the lead free (LKNN6-0.5%CeO2) piezoceramics are prepared using normal sintering technique. The dielectric and piezoelectric properties of the composites were examined as a function of the volume fraction of ceramic particles, all composites showed well dispersion of the piezoceramic particles in the polyester matrix as shown in SEM images. The piezoelectric and dielectric coefficients were found to be improved as the concentration of ceramic particles increases. Although the procedure is simple, the composite prepared in this study exhibited better piezoelectric and dielectric constants with (d33=41 and Ԑr=157) at (80%) volume fraction.

Application of Taguchi Approache to Study the Effect of Filler Type on Tribological Behavior of Polymer Composite Under Dry Conditions

Drai Ahmed Smait; Farag Mahel Mohammed; Hussam Lefta Alwan

Engineering and Technology Journal, 2014, Volume 32, Issue 8, Pages 1916-1930

The tribological behaviour of a G-P ( glass-polyester ) composite system and G-P composite systems interfaced with graded fillers were tested. The composite materials of G-P and G-P reinforced with SiC and Graphite particles as secondary fillers were experimentally investigated under varying loads, sliding velocities with dry surfaces by using a Pin-on-Disc test machine. A plan of experiments, based on the techniques of Taguchi, were performed to acquire data in a controlled way. An L9 Orthogonal array was selected for analysis of the data. Investigations to find the influence of additives, applied load, sliding speed on wear rate, wear resistance as well as the coefficient of friction during wearing process were carried out using ANOVA analysis and regression equation for each response. The model was chosen as "smaller is better" characteristics to analyse the dry sliding wear and friction while "larger is better" for sliding wear resistance. Results show that the additives have the highest influence followed by load and sliding speed. Finally, confirmation tests were performed to verify the experimental results foreseen from the mentioned correlations