A A REVIEW IN SCRATCH DETERIORATION PATTERNS FOR POLYMER AND ITS COMPOSITES

Recently, scratch technique is widely used for characterizing the mechanical properties of awide range of surfaces. In the engineering applications and in order to determine the relativehardness of materials, coatings and paints evaluations, and appraisal a variety of materialdamage countenance when subjected to asperity of the hard counterface, a scratch test wassuccessfully used. In the current work, we have reviewed theoretical models that have beendeveloped in the field of scratching and the scratch way that used for characterizationpolymeric surfaces. In order to design scratch-resistant polymers, we also discussed thevarious wear and scratch damage mechanisms for polymer and its composites. In addition,we discussed the influence of types and concentration of filler on the wear and scratchresistance. The aim of this work is to review the theoretical models that have been developedin the field of scratching and the scratch way that used for characterization polymeric surfaces.

Microwave Non-Destructive Testing of Coatings and Paints Using Free Space Microwave Measurement

Microwave nondestructive testing (MNDT) techniques are applied to evaluate quality of anti-corrosive protective coatings and paints on metal surfaces. A tree-space microwave measurement (FSMM) system is used for MNDT of protective coatings. The FSMM system consists of transmit and receive spot-focusing horn lens antennas, a vector network analyzer, mode transitions and a computer. Diffraction effects at the edges of the sample are minimized by using spot-focusing horn lens antennas. Errors due to multiple reflections between antennas are corrected by using free-space LRL (line, reflect, line) calibration technique. We have measured complex reflection coefficient of polyurethane based paint which is coated on brass plates.