The present work studied the amount of natural and anthropogenic radioactivity in 13 different imported legumes grain specimens various origins, which are part basket foodstuffs provided by government to Iraqi people. These were analyzed using Canberra's sodium iodide NaI (TI) detector gamma spectrometer systems. data gained revealed that activity amounts (Bq/kg) for 214Bi, 137Cs, 40K (238U series), 228Ac (232Th series) all selected measured. Importantly, these investigated magnitudes well...

The friction force between 1/8, 3/32 and 1/16 in diameter, the wear of specimens En 1A steel sliding on a disc S62 are measured at speeds 93 655 ft/s, normal load specimen varying 0.2 4.5 lbf. coefficient is shown to be dependent speed, function N 1/2 U, where U speed. It suggested that contact surface condition which temperature. There evidence suggest gradual change mechanism with increasing magnitude from, (i) metallic abrasion tearing an oxide layer, (ii) skidding shallow ploughing (iii)...

Abstract In this study, nano sized yttria stabilized zirconia (YSZ) suspension in organic solution was deposited by electrophoretic deposition (EPD) method as a protective layer on substrate that previously plasma sprayed thermal barrier coating (TBCs). order to improve the performance of TBC from degradation melt ingression fuel impurities. Design experiments (DOE) Taguchi used optimize controlled variables EPD process. A crack free YSZ overlay carried out at different variables; applied...

In this study, continuous wave CO2 laser with 1.7 and 2 kW were used to deposit clad layers of premixed powders either Ni-10 wt% Al or Ni-30 onto inconel 617 substrate. Different cladding traverse speeds in the range 1 35 mm/s for powder 1.65 11.2 Al. Two feeding rates used, 10 8.9 gm/min respectively. The other independent variables selected be constant. results showed that different percentages area dilution found ranging from 3.7 78.3% 6.9 41 % depending on used. Furthermore, was affected...

The present work was designed on producing nanohydroxyapatite layers using electrophoretic deposition (EPD) 316L stainless steel substrate. EPD coatings were prepared by the of hydroxyapatite (HA)-chitosan nanocomposites different substrate roughness (polish surface, 220 grit SiC grind, and sand blast surfaces). Depositions performed suspensions HA nano particles (3 g/L) in mixture alcohol distilled water (ethanol, 5 vol. %water containing 0.5 g/L chitosan dissolved 1 vol.% acetic acid....

Abstract The copper nanoparticles (CuNP) films have been deposited on Aluminum-4015 substrate by PVD technique. Structural of thin film layer achieved analyzed X-ray diffraction (XRD). While the chemical composition percentage multilayers (Zn-Ni) combined with and evaluated via ED-XRF, other characterization likes surface morphology investigated using scanning electron microscopy (SEM), FESM AFM. Optical properties especially thermal absorption was measured in UV/Vis range. effect coating...

In this study, polyethylene glycol (PEG) and natural dye were employed to make the liquid electrolyte media for solar cells. To prepare varied amounts of dye, yellow flowers was extracted using diluted ethanol via ionized water. produce a constant concentration all polymer liquids, 10g PEG dissolves in 1000 ml solvents including: (di-water, dilute concentrated dye) individually. The viscosity solutions determined an Ostwald viscometer at various temperatures. Optical parameters such as...

To determine the effect of austenite stabilizer element on microstructure and behaviour as–cast high Cr white cast iron Fe-21Cr-3Ni-1.7Mo-2.4C, different percentages Mn (0.4, 0.9, 1.3, 1.7, 2.2 2.6 wt%) were added. Detailed investigations carried out using scanning electron microscopy, energy dispersive spectroscopy analysis (EDS), X-ray diffraction hardness test. It showed that with increasing addition, phase (γ) as-cast alloys refine clearly. The morphology for all is a mixture dendrite...

Experiments are described in which stationary copper specimens rubbed a normal atmosphere against rotating S62 steel disc under loads up to 4·5 lbf. The coefficient of friction is measured at sliding speeds 93, 220, 328, and 490 ft/s using ⅛-in diameter specimens. Except the lowest speed gradual buildup continuous oxide layer on track observed with increasing load together corresponding decrease friction. Having established an low for all loads. shown N U, be function 1/2 depend state...

The present study postulates the phases formed/oxidation resistance of aluminum alloyed cast irons (0 to 4 wt% Al) based on scanning electron microscopy, energy dispersive X-ray spectroscopy (EDS), diffraction and oxidation test. Mechanisms alloys were determined at high temperatures (700-1000 oC). A direct relationship between Al content temperature was found; a lower (less than 800 oC), low resistances obtained characterized by formation FeO, Fe3O4 Fe2O3. With increasing content,...

The laser sintering process and modification of yttria-stabilized zirconia (YSZ) coatings subjected to electrophoretic deposition (EPD) on YSZ air-plasma-sprayed (APS) thermal barrier (TBCs) were investigated. A Ni-based superalloy was plasma-sprayed using create a coating with 400 μm thickness. technique used deposit the nanopowder surface TBCs. In this study, technology based direct green EPD layer beam employed. best conditions for overlay DC current obtained an applied voltage 40 V, time...

The needs to combine selection of materials (SM) processes during the early stages design have previously been realized. In this work, an attempt is made ensure that there no gap between function oriented and material. A methodology being developed, for a concurrent qualitative method (CQSM) takes into consideration importance properties in stages. modified from quantitative called weighting property used selecting detailed stage. was method; it means input data must be which consisting...

Laser sealing of zirconia-6.5 wt% yttria partially stabilized zirconia (YPSZ) plasmasprayed layers were examined for both plan views and transverse sections. Scanningelectron microscopy (SEM) has been used extensively to characterize the general featuresand microstructure under optimum laser processing conditions. The beamis shown be effective in modified plasma sprayed by porosity anddecrease roughness. Thermal shock resistance test reveals that sealed have beenan excellent cracks formation...

This study focuses on preparing and evaluating AgY zeolite as an adsorbent for the desulfurization (ADS) of dibenzothiophene (DBT) using a model fuel. Kinetic models adsorption isotherms were investigated this process. The characterization was studied XRD, BET, XRF. XRD XRF techniques revealed that successfully prepared with 21.42% wt. Ag. BET results showed pore volume 0.3596 cm³/g surface area 531 m²/g. done initial sulfur content 100–460 ppm. With 93% removal from concentration 100 ppm,...

The high temperature corrosion behavior of thermal barrier coating (TBC) systemconsisting IN-738 LC superalloy substrate, air plasma sprayed Ni24.5Cr6Al0.4Y (wt%)bond coat and ZrO2-20 wt% ceria-3.6 yttria (CYSZ) ceramic coatwere characterized. upper surfaces CYSZ covered with 30 mg/cm2 , mixed 45 wt%Na2SO4-55 V2O5 salt were exposed at different temperatures from 800 to 1000 oC andinteraction times 1 up 8 h. surface plan view the coatings wereidentified for topography, roughness, chemical...

Three types of plasma-sprayed ZrO2 stabilized by 8 wt. % Y2O3 (YSZ) thermal barrier coatings (TBCs) were prepared changing spray distance (70,100,130) mm. Porosity measurement is a key factor to identify the performance (TBCs). Combination image analysis (IA) and Mercury intrusion porosimetry (MIP) techniques used analyze porosity pore size distribution. The was categorized based on (diameter). To optimize properties maintained them during service, it will be important design TBCs with...