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Article
Estimation the Efficiency of Nano Particles Coating on Carbon Steel by Atomization

Authors: Rana Afif Anaee --- Ahmed M. Al- Ghaban --- Douaa A. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 5 Part (A) Engineering Pages: 876-886
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this work, three nanoparticles were applied as coatings on carbon steel using atomization method (cold spraying) by airbrush.The coatings includednano Al2O3,nanoSiC and nanoZrO2 materials. The characterization of coated surfaces has been investigated by AFM and SEM. All these inspections indicated that the deposition of nanoparticles on carbon steel surface was uniform and homogeneous. Thethickness of coated layers was calculated using gravimetric method, while the particle size and roughness were measured from the analysis of atomic force microscopy.With constant conditions of coating, nano alumina coating gave the highest thickness (6.2216 nm) due to agglomeration of these particles compared with others as illustrated in SEM images. Corrosion test was performed to estimate the corrosion resistance, protection efficiency and porosity percentage which indicated the role of nano particle coating on corrosion control. These data showed that the nano alumina was better than other coatings and gave PE 99.69%.Cyclic polarization was also estimated to show the probability of pitting corrosion. The coating with alumina gave the best data for decreasing the chance of pitting corrosion.


Article
Binary and Ternary Nanoceramic Coatings to Protect Carbon Steel in Artificial Seawater

Authors: Rana Afif Anaee --- Ahmed M. Al- Ghaban --- Douaa A. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 15 Part (A) Engineering Pages: 2854-2863
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Binary and Ternary nanoparticles coatings have been applied on carbon steel using atomization method (cold spraying) to corrosion control in seawater. Nanoparticles were included Nano Al2O3, SiC and ZrO2. The characterization of coated surfaces has been investigated by AFM and SEM in addition to calculate the coating thickness. The binary coatings deal with 50%Al2O3-50%SiC, 50%Al2O3-ZrO2 and 50%SiC-50%ZrO2, while the ternary coating was 60%Al2O3-20%SiC-20%ZrO2. The results showed that 50%Al2O3-50%SiC had the lowest thickness and most uniform distribution in AFM and SEM due to closing in particle sizes. Corrosion test achieved to estimate the corrosion resistance, protection efficiency and porosity percentage which indicated the role of Nano particle coating to corrosion control. These data showed that the Nano 50%Al2O3-50%SiC coating had the most noble corrosion potential, lowest corrosion current density (lowest corrosion rate), highest corrosion resistance, highest efficiency 99.651 % and lowest porosity percent 1.438×10-11. Cyclic polarization also estimated to show the probability for pitting corrosion. The coating with 50%Al2O3-50%SiC gave the highest breakdown potential equal to +69mV.


Article
Investigation of Addition Different Fibers on the Performance of Cement Mortar

Authors: Aya A. Shaher --- Hussein A. Jaber --- Ahmed M. Al-Ghaban
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 9 Part (A) Engineering Pages: 957-965
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work presents an investigation of possibility incorporate of synthetic fibers (glass, nylon and carbon) at two states (short: 1cm, long: 5cm) effects on the mechanical properties of mortars (cement: sand composition (1:3)). Fibers materials used at different weight percentages ranged of (0, 0.4, 0.8, and 1.2) wt%. Density, water absorption, porosity, thermal conductivity, compressive strength and flexural strength experimentally investigated for mortar specimens after curing for (28 days). The results showed that the incorporation of these fiber materials improvement mechanical and physical tests for all reinforced samples with short and long fibers, and that the highest value of the mechanical and physical properties obtained from long fiber (5cm) reinforced cement samples with (1.2%Nylon), reaching the rate of increase in values of compressive strength by (17.74%), flexural strength by (52.8%), and water absorption by (4.54%), while reaching the rate of decrease in values of density by (5.32%). The higher values for short fiber (1cm) reinforced samples reaching the rate of increase in values of compressive strength by (10.92%), flexural strength by (40.65%), and water absorption by (6.65%), while reaching the rate of decrease in values of density by (8.91%). Results of thermal conductivity test showed decrease in values conductivity for all mortar samples with long short synthetic fibers and that the minimum value of conductivity obtained with (1.2%Carbon), reaching the rate of increase in values of thermal conductivity by (41.84%) for long fiber reinforced samples, while the lowest value for conductivity by (75.98%) for short fiber reinforced samples.


Article
A Comparative Investigation on Mechanical Properties of Various Fibers Reinforced Concrete

Authors: Hussein A. Jaber Aya A. Shaher --- Ahmed M. Al-Ghaban
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2019 Volume: 37 Issue: 1 Part (A) Engineering Pages: 28-36
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The present work presents an investigation the effect of addingvarious fiber materials such as (glass, nylon, and carbon) into the concrete mix for inspectingand compare the mechanical properties of different fibers reinforced concrete. Two different fiber length states of (short=3cm and long=10cm) are used in this work. The concrete of ordinary Portland cement of (1:1.5:3), (cement: sand: gravel), were mixed with each of the fiber materials at four different weight percentages (0, 0.4, 0.8, and 1.2) wt% per cement content. Compressive strength and flexural strength were experimentally investigated of different fibers reinforced concrete specimens after curing for 28 days. The results showed that the incorporation of various fibers with the concrete mix generally improved the strength of concrete by improvingthe toughness. The flexural strength of concrete with addition of various fibers was strongly enhanced than compression. Addition 0.8% of nylon fiber to concrete resulted in the maximum increase of itscompressive strength, reaching the rate of increasing to 11.08% for short fiber and 20.75% for long fiber. Addition 1.2% of nylon fiber to concrete mix resulted in the maximum increase of the flexural strength, reaching rate of increasing to 120.02% for short fiber and 211.49% for long fiber. Increasing the length of fibers increases the strength of the concrete but a little extent. Among these fibers, nylon containing concrete composite exhibits promising mechanical strength that could be easily used as low-cost partitioning wall, false ceiling,and other household purposes.


Article
Study The Effect of Micro CaCO3 and SiO2 and their Mixture on Properties of High Strength Concrete

Authors: Ahmed M. Al Ghaban --- Aseel B. Al Zubaidi --- Zahraa F. Jawad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 10 Part (A) Engineering Pages: 1027-1033
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper investigated the effect of incorporating two types of micro particles micro CaCO3 and micro SiO2 on mechanical properties and durability of concrete. Micro materials were added in four different dosages of 1%, 2%, 3% and 4% by weight as partial replacement of cement in concrete mixture. Mechanical properties of hardened concrete (compressive strength, flexural strength and split tensile strength) have been done after 28 days of water curing. In addition, water absorption test was carrying out for obtaining the durability properties of concrete specimen. Binary combination of micro CaCO3 + micro SiO2 were also studied the combined effect of the micro particles. Micro-structural characteristic of modified concrete was done through the scanning electron microscope. The results showed that incorporation of micro CaCO3 and micro SiO2 particles lead to increase the packing and enhance the mechanical properties and durability of concrete. A significant performance was observed in case of micro silica addition to the concrete in comparing with other micro particles.


Article
Physical Properties Study on Ti-C/NanoCeramics Composite

Authors: Ahmed M. Al-Ghaban --- Niveen J. Abdulkader --- Hadeel A. Al baiaty
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 11 Part (A) Engineering Pages: 1185-1188
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The effect of introducing Al2O3 and CuO nano particles on thephysical properties of sintered Ti-C based materials has been studied.Titanium and carbon elemental powders have been mixed with nanoparticlesof Al2O3 and CuO to produce composites of Ti-C/ceramics at 1100 °C. TheXRD results show that for different amount of mixed nanoparticles, TiC, TiO2,and some rest of the reacted powders are the most dominant stable phases. Interms of physical properties, the results show that the raised Al2O3 percentageleads to gradually increase in apparent density of the sintered mixture ascompared with the purely prepared TiC. Moreover, porosity and waterabsorption decrease with increasing Al2O3 percentage. On the other side,adding CuO to the sintered mixture causes in decreasing the apparent density.Furthermore, it was observed that CuO creates much porosity and increasewater absorption of the sintered mixture.


Article
Corrosion Behavior of V2AlC and Cr2AlC Compared with SS 316L in NaOH at Four Temperatures
السلوك التآكلي للمواد V2AlC و Cr2AlC بالمقارنة مع الفولاذ المقاوم للصدأ في هيدروكسيد الصوديوم عند اربع درجات حرارية

Authors: Russul F. Faleh رسل فاضل فالح --- Ahmed M. Al-Ghaban احمد محمد الغبان --- Rana A. Anaee رنا عفيف عنائي
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2015 Volume: 11 Issue: 2 Pages: 12-19
Publisher: Baghdad University جامعة بغداد

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Abstract

This work involves the manufacturing of MAX phase materials include V2AlC and Cr2AlC using powder metallurgy as a new class of materials which characterized by regular crystals in lattice. Corrosion behavior of these materials was investigated by Potentiostat to estimate corrosion resistance and compared with the most resistant material represented by SS 316L. The experiments were carried out in 0.01N of NaOH solution at four temperatures in the range of 30–60oC. Polarization resistance values which calculated by Stern-Geary equation indicated that the MAX phase materials more resistant than SS 316L. Also cyclic polarization tests confirmed the resistivity of MAX phase materials through disappears of hysteresis loop.

يتضمن هذا البحث تصنيع مواد الطور MAX التي تُعد من المواد الجديدة المميزة بانتظام في الشبكة البلورية باستخدام ميتالورجيا المساحيق، وتم دراسة السلوك التآكلي لهذه المواد باستخدام المجهاد الساكن لتقدير متغيرات التأكل والمقارنة مع المادة الاكثر مقاومة والممثلة بالفولاذ المقاوم للصدأ 316L. اجريتْ جميع التجارب في وسط قاعدي من هيدروكسيد الصوديوم بتركيز 0.01 نورمالية وعند اربع درجات حرارية ضمن المدى 30 – 60 درجة مئوية. وقد بينتْ نتائج مقاومة الاستقطاب المحسوبة بمعاولة ستيرن-جيري بان المواد المحضرة تمتلك مقاومة افضل من الفولاذ المقاوم للصدأ. كما ان الاستقطاب الحلقي اكد مقاومية هذه المواد مقارنة مع الفولاذ المقاوم للصدأ من خلال عدم ظهور الحلقة الهستيرية.

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