Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Particle size

Intervening of Electrochemical Machining Parameters on Particle Size of ZnO Powder and Metal Removal Rate

H.S. Mohammed; S.K. Shather

Engineering and Technology Journal, 2017, Volume 35, Issue 5, Pages 431-438

Electrochemical machining (ECM) is an advanced machining process belonging to electrochemical category. Where in the material removal takes place by anodic dissolution of work piece in an electrolytic solution. This research presents results of the Electrochemical Machining (ECM) process, which was used to remove metal from the internal hole of the work piece (pure Zinc) by brass tool in an aqueous solution NaCl solution. The experimental study the effect of (ECM) process parameters such as (Current density, Gap distance, Electrolyte concentration) on Metal Removal Rate (MRR) and particle size of (Zinc oxide) sludge waste that precipitate from ECM. X-ray diffraction pattern for the resultant powder shows well-crystallized Zinc oxide powder The results indicated that particle size decreases from (82.432 to 24.6μm) and enhancement of MRR by (58.15%) with increasing current density. The increasing in gap distance between tool and work piece from (0.5 to 1.5) mm causes increasing in particle size from (76.451 to 91.81) μm and decrease (MRR) to (11.07%). For electrolyte concentration increasing from (100 to 300 g/l) leads to decrease in particle size from (89.218 to 32.406) μm, while improvement in MRR by (4.83%).

The Effect of pH on Partial Size of Ferrimagnetic Powders Prepared by Auto Combustion Method

Ghead K. Salman; Saja M. Jabaar

Engineering and Technology Journal, 2016, Volume 34, Issue 2, Pages 269-277

During the preparation of this research ferrites - copper powder chemical auto-combustion method ,has been studying the effect of changing of (pH=3, 5, 7, 9, 11) coefficient on the particle size of the powder, used Debye-ScherrerFormula, to calculate the particle size by use of the highest peak (311) in X-ray diffraction (XRD) were obtained particle size ranges (11.5-13.75) nm, and also has been compared to the values obtained in drawing curves that represent change the latticeconstant, particle size and density as a function of the (pH), and used Infrared spectroscopy (FTIR) to determine the internal structure of models, and also has been studying the microscopic structure took photos by electron scan microscopy (SEM) where indicated formation of high porosity homogeneous this change in the acidity coefficient(pH)led to change particle size and therefore a change in the properties of structural and physical .