Kovar alloy was machined and prepared as half bushes with diameter 1.6cm and length of 1.5 cm. Many specimens were prepared and subjected to wear testing system under lubricated condition. The tests were carried out under different condition such as sliding speed of 750rpm and fixed lubricant type and under variable conditions such as sliding time and normal loads. Weight loss and wear rate were determined for all samples and under different conditions. Kovar debris suspended in oil lubricant and placed in special container and subjected to X-Ray Fluorescence system to determine the quantitative and qualitative analysis.

Abstract-Titanium dioxide (TiO2) nanoparticles (NPs) colloidal that have been synthesized via Nd-YAG laser technique in pure distilled water. The produced NPs were characterized by UV-Vis absorption spectrophotometer and Transmission Electron Microscope (TEM). The surface Plasmon resonance of the colloidal determined by UV-Vis absorption spectra and the absorption peak located at 200nm. TEM exhibits that the size of NPs ranged between 10-80 nm. The antimicrobial activity was tested against Escherichia coli ATCC (gram negative bacteria) and Staphylococcus aureus ATCC 25923 (gram positive bacteria). Prepared TiO2 NPs exhibited inhibitory activity in both bacteria strains with best selectivity against gram-negative bacteria.