Effect of compaction pressure and velocity on the green compacts roughness that manufactured by metal powder technique

In this research, It has been studied the effect of compaction pressure on the final roughness for the top and down surfaces for the green compacts that manufactured by meal powder technique and it has been studied also the effect of piston velocity (compaction velocity) on the final roughness for the same two surfaces. The results present that the curved for the top surface roughness is completely decreasing and as the pressure has increased, the value for roughness has reduced and the mean roughness (Ra) has very close values, where these values have made curve from second degree and opposite relationship. The results were same for the down surfaces but with different variations.

Studying and Improvement of Strength in Adhesive Joints

The aim of this study is to determine strength of adhesive single-lap joints of Aluminum alloys which are widely used in geometric applications. It was investigated to define the influence of overlap length and surface roughness value on shear strength of achieved adhesive joints. It was used Epoxy and Acrylic adhesives to prepare adhesive joints and all the specimens were subjected to axial tensile tests and the results are presented as a comparison. Results of those tests showed that shear strength increased with increasing each of overlap length and surface roughness of adherends and Acrelicadhesiveproduced4better results according to failure mode of tested samples.

An-Invitro Study to Some Mechanical Properties of Cobalt-Chrome Alloys in Sodium hypochlorite and distilled water

The current research aims to study the effect of chemical disinfectants on the roughness and hardness of the surface of the cobalt chrome alloy, where the use of cleansing Sodium hypochlorite 5.25% and distilled water (the control sample), Been manufacturing 20 structure metal of the alloy cobalt chrome, each group containing 10 samples and was doused with samples intravenously cleared, then it was measured surface roughness using an Atomic force microscope, and measuring the hardness of the surface using a Vickers measuring device hardness.

Height and Feature Parameters Study of thermally evaporated ZnS thin films By AFM

AFM has been used to get microscopic information of the surface structure and to plot topographies representing the surface relief. AFM technique can be used to visualize the surface relief, specify the growth of thin films, and determine Height parameters.