Percentage Of Nickel Research Articles

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Tensile Properties of 7075 Aluminum Alloy

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. The effect of adding Nickel and heat treatments on the microstructure, formed phases and tensile properties of the 7075 aluminum alloy were studied in this paper. Different percentages of nickel [0.1, 0.5, 1] wt% was added to 7075 Aluminum alloy, and various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) was applied on the 7075 alloys that containing nickel. The results obtained by applying of RRA treatment were better than the results of T6 treatment, the tensile properties increased and the microstructure became softer by adding nickel to the studied alloys. The maximum tensile strength of 7075 aluminum alloy was (UTS = 437 Mpa) when RRA heat treatment was applied and 0.5% nickel was added.

Catalytic removal of NO2 by Nickel _ platinum catalyst supported on multi-wall carbon nanotubes

<p>In the present study, the NO2 removal efficiency at concentrations of 3000 to 5000ppm was evaluated by nickel and platinum bimetallic catalyst supported on multiwalled carbon nanotubes (Ni-Pt/MWCNT) along with water vapor at different space velocity and temperatures. Morphological and structural characteristics, material formation phases and catalyst regeneration were investigated by FE-SEM, XRD and TPR tests, respectively. The results showed that increasing the weight percentage of platinum at Ni-Pt/MWCNT catalyst improved the removal efficiency at low temperature. The catalyst 25%W.Ni-3%W.Pt/MWCNT provided 92% removal efficiency at the temperature of 300℃, space velocity of 25000/hr and concentration of 3000 ppm, while,the 15%W.Ni-5%W.Pt/MWCNT represented highest removal efficiency (70%) at the temperature of 150℃. The removal efficiency of Ni-Pt/MWCNT catalyst is affected by the weight percentage of nickel and platinum, as well as the NO2 concentration at various temperatures. The results suggest that H_2 O can be used as a reducing agent to reduce 〖NO〗_2 by produced〖 H〗^+. The 25%W.Ni-3%W.Pt/MWCNT catalyst removal efficiency at the vicinity of water vapor and concentration of 3000 ppm 〖NO〗_2 , unchanged stability over the period of 100 minute.</p>

Impact of multiple reflow on intermetallic compound of nickel‐doped tin‐silver‐copper on ENImAg substrate

AbstractThe growth of intermetallic compounds (IMCs) of the tin‐silver‐copper‐nickel/electroless nickel immersion silver (SACN/ENImAg) at the 230 °C during multiple reflows was investigated. The characterization analysis of the samples was conducted using scanning electron microscopy and assisted by a dispersive x‐ray analysis. A layer of continuous (Cu, Ni)6Sn5 and discontinuous (Ni, Cu)3Sn4 intermetallic were formed at the interface after up to the third reflow, while Ag3Sn nano‐sized was formed on the intermetallic surface. The total thickness of the intermetallic layer increased as the reflow increased. The findings also revealed that the intermetallic thickness became thicker with the mass percentage of nickel increased. Hence, the intermetallic growth was controlled mainly by reflow times and nickel content in solders.

Nickel recycling through bioleaching of a Ni/Al2O3 commercial catalyst

Bioleaching studies were carried out on a commercial nickel-based reforming catalyst using two acidophilic bacteria (Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans) under several types of bioleaching mode (one-step, two-step and spent medium-step) and catalyst pretreatment (with and without reduction). The highest percentage of nickel extraction was achieved using A. thiooxidans under spent medium-step (94.4 ± 0.1%). The percentage of nickel extracted was constant (85.6 ± 3.9%) up to a pulp density of 5% w v−1, and it decreased at higher pulp densities due to acid depletion. In order to assess the potential reuse of the recovered metal, the nickel solution obtained by bioleaching was recycled by using it to prepare a new Ni/Al2O3 catalyst by impregnation of a commercial alumina support. Characterization of the catalyst prepared from recycled nickel showed that it had a high purity along with a suitable texture and metallic dispersion. Indeed, the activity of the new catalyst in the dry reforming of methane provided a high conversion of methane (99%) with good stability over time under the experimental conditions employed.

Thermal Cycling Study of Electrodeposited Sn–Ni and In–Ni Alloys

We report the electrochemical deposition of Sn–Ni and In–Ni alloys containing 20 and 45 wt % of the lower melting point component. The percentage of nickel in the deposited alloys has been determined by gravimetric analysis. We have studied the thermal behavior of the deposited materials in heating–cooling cycles in the temperature ranges 50–250, 50–300, and 50–400°C. The results of this study can be useful in high-density mounting using Pb-free solder materials with a preset soldering temperature.

Simultaneous separation of nickel and copper from sulfuric acid using chelating weak base resins

AbstractBACKGROUNDThe management of industrial spent acids containing metals to be potentially recovered for further reuse is within the scope of circular economy principles. In particular, spent sulfuric acid solutions are usually treated by precipitation technologies, which are limited by the lack of selectivity thus affecting metal reuse. In this work, acidic effluents containing nickel (≈9 g L−1), copper (≈3 g L−1) and iron (≈24 g L−1) in sulfuric acid media were treated with commercial chelating resins. Iminodiacetate (Purolite®S930Plus) and bis‐picolylamine (MTS9600®) resins were selected to perform the selective recovery of nickel and copper over iron, which is an impurity for further metal recovery by electrowinning.RESULTSUnder the selected operation conditions (pH ≈ 2), resin MTS9600® reported the best separation results with removal percentages of copper, nickel and iron of ≈80%, ≈99% and ≈10% respectively. The adsorption equilibrium of copper and nickel were described by the Langmuir (qm,Cu = 48 309 mg kgdryresin−1 and KL,Cu = 9.1 10−2 L mg−1) and Freundlich (KF,Ni = 645 (mg kgdry resin−1)(L mg−1)1/n) and nNi = 2.29) models, respectively. Kinetic experiments confirmed that copper removal is preferential and weakly influenced by the operation conditions being described by a pseudo‐first‐order model. On the contrary, nickel kinetics that followed a pseudo‐second order are strongly affected by reducing both the pH and the solid–liquid ratio.CONCLUSIONSThe promising results confirm that resin MTS9600® is an effective adsorbent for the removal of nickel and copper at strong acid conditions. More research is being conducted to analyze the resin regeneration and the selective recovery of target metals. © 2020 Society of Chemical Industry

Ni, C, N, S multi-doped ZrO2 decorated on multi-walled carbon nanotubes for effective solar induced degradation of anionic dye

The present work deals with the synthesisis of Ni, C, N, S multi-doped ZrO2 / MWCNT’s nanocomposites varying nickel percentage in ZrO2 by homogeneous co-precipitation and fabricated on MWCNT’s by ultrasound-assisted hydrothermal method. The nanocomposites were characterized by TEM-SAED, SEM-EDAX, XRD, FT-IR and UV–vis techniques. SEM-EDAX, XRD, FT-IR techniques confirmed Ni, C, N and S doping in ZrO2. The TEM image revealed fabrication of multi-doped ZrO2 nanoparticles on nanotube surface. The nanocomposites employed for photocatalytic degradation of Indigo Carmine anionic dye in eco-friendly solar radiation. Amongst all nanocomposite 1 % nickel concentarion in ZrO2 exhibited much higher photocatalytic degradation efficiency (96 %) as compared with bare ZrO2 (19 %), C,N,S (48 %), 0.3 % (81 %) and 0.6 % (88 %) in 180 min of irradiation at alkaline pH and 3 mgL−1 catalyst loading following first order rate kinetics (Ka = 16.10 × 10−3) by virtue of it lower band gap (4.17 eV) confirmed by UV–vis spectrum. The degradation was confirmed by GCMS and TOC analysis. Synergism of MWCNT’s by electron trapping to generate O2- major species confirmed by scavenger addition experiment. The reusability study demonstrated stability and effectiveness of synthesized material for multiple cycles.

Changes in the Grain Element Contents of Durum Wheat Varieties of Turkey Registered between 1967–2010

ABSTRACTWhile grain yield is the main consideration in developing new cultivars, grain element compositions were also affected by the process of plant breeding. This research aims to evaluate genotypic variation in thousand kernel weights (TKW), percentages of yellowberry kernels (PYK), boron, calcium, copper, iron, potassium, magnesium, manganese, sodium, nickel, phosphorus, sulfur, and zinc contents in the grains of 29 Turkish durum wheat cultivars (triticum durum) released between 1967–2010. Element contents of grain samples are determined with inductively coupled plasma optical emission spectrometry (ICP-OES). Results of 2 years of field trials indicated significant variation between cultivars in terms of all investigated traits (p < .01). TKW of Turkish durum cultivars along with calcium, copper, and sulfur contents are found to be consistently increasing over time with positive correlations to each other. On the other hand, boron and zinc contents of the grain remained unaffected during the process of plant breeding when sodium contents decreased. We suggest that selecting for new germplasm to increase iron, zinc, and phosphorus contents of durum grain will contribute to the nutritional value of its products.

Laboratory Rational of Changes in the Crystal Lattice of Nickel-Titanium Endodontic Rotary Files in Autoclaving

Objectives The aim of this study was to investigate the changes of the crystal lattice of NiTi instruments after repeated autoclave sterilization cycles based on the results to conclude about the influence of multiple sterilization on the characteristics of ProTaper clinical use. Methods 21 samples of ProTaper Universal rotary files were divided into 3 groups of 7 samples. After 1, 4, and 7 cycles of sterilization, the samples were observed using еnergy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). Results EDS analysis confirmed that all samples were composed mainly of nickel and titanium, also Fe (presumably steel), Cr, Co, and Zn were found. The percentage of nickel and titanium was affected by repeated sterilization cycles. The mass fraction of Fe, Co, Zn, and Cr decreased after 1, 4, and 7 sterilization cycles. According to the results of the second study, it was found that, with increasing autoclaving cycles, the percentage of Fe decreased. There were changes in the three obtained diffractograms, which indicated an increase in the number of the martensitic phase and a decrease in austenitic. The cutting efficiency of the ProTaper is also reduced during repeated sterilization cycles, which can be caused by the austenitic and martensitic phase displacement. Conclusion Manufacturing features and repeated sterilization cycles increase the internal deformation in the structure of NiTi alloy, which increases the risk of fracture.

Effect of Nickel Reinforcement on Micro Hardness and Wear Resistance of Aluminium Alloy Al7075

Presently, wear resistance of aluminium alloys have gained a greater importance in various industrial applications. Research works regarding strengthening of aluminium alloys introduced a new class of composites, i.e. aluminium intermetallic composites. Aluminium alloy Al7075 with zinc as the major alloying element is widely used in various industrial fields, and there is a research scope in fabricating Al7075-Al3Ni intermetallic composites by reinforcing nickel particles. In this study, four composites of different weight percentages (i.e. 1%, 5%, 10%, and 15%) of nickel and base alloy were fabricated by using stir casting method. After fabrication, the materials were subjected to T6 heat treatment. The micro hardness evaluation of the composites before and after the heat treatment was performed, and compared with the base alloy. Micro hardness of base alloy was improved up to 146% by reinforcing 15% nickel followed by the heat treatment. Wear rate of heat treated base alloy and composites was studied. Heat treated Al7075+15% nickel composite shows more wear resistance (about 93% resistant than heat treated base alloy). The wear properties of heat treated Al7075+15% nickel composite was studied at different applied loads and sliding velocities.

Cold Deformation and Hardness on Superaustenitic Stainless Steel: Evaluation Methods

Superaustenitic stainless steel with high nickel percentage, chromium, molybdenum and nitrogen, has replaced austenitic AISI 304 and 316, mainly in the petrochemical industries, where high toughness, stress corrosion resistance and pitting resistance is suitable. Due to high mechanical stress in the cold deformation manufacturing, residual stresses in the pipes are common. In this case, the possibility of the corrosion process increases. Considering the area reduction after tensile tests, the objective of this study was to evaluate the effects of cold deformation on a superaustenitic steel BS EN 10283 No 14587. The steel was elaborated in an electric induction furnace and the liquid metal was poured out in sand molds. Afterward, samples cut from a specimen submitted to the tensile test were prepared for X-ray diffraction, Vickers hardness measurements, linear polarization and impedance electrochemical tests. The corrosion tests were performed in solution with 3.5% NaCl. The results show that there is a linear increase in hardness and also a decrease in corrosion resistance of the material, with increasing cold deformation. In addition, the cold work reduction was not sufficient to promote strain-induced martensite.

The effect of Nickel percentage on the dielectric properties of Bentonite

This paper reports on the systematic measurement and modelling of the impedance spectra in Bentonite support (solid pellets) with various Ni content (x = 0%, 1%, 3%, 5%, 7%, 13%, 15%, 17% and 20%) for the aim of investigating the dielectric loss tangent versus x. The extracted conductivity and loss tangent exhibited nonlinear variations with x and only rapidly increased above x = 13%. This behavior is more pronounced at low frequencies <100 kHz and is qualitatively consistent with reports about the conductivity of metal–insulator mixture, suggesting better dispersion efficiency of Nickel on Bentonite.

ДОСЛІДЖЕННЯ АМПЛІТУДНО-ЧАСТОТНИХ ЗАЛЕЖНОСТЕЙ ЗАХИСНИХ ВЛАСТИВОСТЕЙ МАГНІТНИХ ЕКРАНІВ НА ОСНОВІ АМОРФНИХ СПЛАВІВ

Сучасні методи екранування допускають використання найбільш придатних металевих матеріалів для одночасного вирішення декількох задач для захисту працюючих та електромагнітної сумісності технічного обладнання. Одним з таких ефективних металевих матеріалів вважають аморфні магнітом’які сплави. Предмет дослідження даної роботи – визначення захисних властивостей аморфного магнітом’якого сплаву при різних значеннях частотних та амплітудних характеристик в залежності від зміни товщини стрічки матеріалу. Досліджено магнітні властивості пермалою від різної частоти екранованого поля з різним відсотковим вмістом нікелю та різною товщиною захисного металевого матеріалу; залежності коефіцієнта екранування магнітом’яких аморфних сплавів від індукції зовнішнього магнітного поля; коефіцієнти екранування аморфного магнітом’якого сплаву різної товщини та різного відсоткового вмісту кобальту від змінних значень амплітуди; магнітооброблений стан та вихідний стан (недоліки та переваги для конкретних умов використання при захисті та економічних вимог); залежності магнітної проникності магнітом’якого аморфного сплаву від різних значень частоти та амплітуди. Мета роботи - визначення коефіцієнтів екранування захисних аморфних магнітом’яких сплавів від амплітудно-частотних характеристик екранованого магнітного поля та обґрунтування ефективності використання таких матеріалів та надання конкретних рекомендацій щодо захисту від електромагнітних полів та випромінювань працюючих людей та сумісності електричного та електронного технічного обладнання. Розроблено захисні властивості магнітних екранів на основі аморфних сплавів у різних амплітудно-частотних діапазонах. Запропоновано раціональні обґрунтовані рекомендації щодо вибору матеріалу для забезпечення найбільш придатних значень коефіцієнтів екранування Доведено експериментально що аморфні магнітом’які сплави мають сприятливі коефіцієнти екранування від частоти екранованого поля, що підвищує ефективність захисту від магнітних полів працюючих людей та спрощує, з економічної точки зору, обрання матеріалу на конкретному виробництві. Отримані графічні залежності надають можливість обирати необхідний захисний металевий матеріал та автоматизувати процеси розроблення засобів оптимального екранування магнітних полів. Багатосерійність досліджень та легка керованість властивостей матеріалів з різним вмістом металевої субстанції, різної товщини стрічки матеріалу, тощо надає змогу змінювати загальні захисті властивості металевого сплаву ( в залежності від поставленої умови на виробництві)

Biological Activity and Characterization of Green Synthesized Nickel Oxide Nanoparticles Derived from Sterculia foetida Leaf Extract

The catalytic, optical and thermal properties are based on the size of the nanoparticles. Nickel oxide nanoparticles have unique optical property and excellent antibacterial activity. The present study aims for the synthesis of Nickel oxide nanoparticles (NiO NPs) using Sterculia foetida (S. foetida) leaf extract as reducing agent by solution combustion method. The synthesized Nickel oxide nanoparticles (NiO NPs) were confirmed by UV-Visible spectroscopy (UV) with the peak at 370 nm and at the temperature of 450 ± 10 °C, Fourier transform infrared (FTIR) wavelength was observed at 1418 cm–1 1027 cm–1 shows C–O stretching vibration and at 507 cm–1 vibration of Ni–O bond found. Crystalline structure and the formation of monoclinic phase revealed by Powder X-ray diffraction (PXRD) pattern, the percentage of nickel and oxygen of NiO NPs were confirmed with EDAX analysis. The Scanning electron microscopy (SEM) and Transmission electron microscope (TEM) images indicate the shape of Nickel oxide nanoparticles (NiO NPs) with the size range of 10–51 nm. Staphylococcus aureus (S. aureus) (Gram positive) and Escherichia coli (E. coli) (Gram negative) bacteria's were taken to study about antibacterial activity against the green synthesized Nickel oxide nanoparticles (NiO NPs). The Nickel oxide nanoparticles have pharmaceutical and other biomedical applications.

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

Synthesis and Characterization Complex Nickel(II) with Diphenylamine

Ni(NO3)2.6H2O and diphenylamine formed a complex compound in 1:6 mole ratio of metal to ligand in methanol. The forming of the complex was indicated by shifting of maximum wavelength in UV-Vis spectra. Analysis of the nickel percentage in the complex by Atomic Absorption Spectroscopy (AAS) showed an empirical formula of the complex was Ni(diphenylamine)4(NO3)2.6H2O. The conductivity measurement of the complex showed the charge ratio of cation and anion = 1:1. It meant that NO3- was coordinated to the Ni2+ center ion and likewise as a counter ion. The formula of complex was approximated [Ni(diphenylamine)4(NO3)(H2O)](NO3).5H2O. Based on infrared spectra, it releaved diphenylamine as monodentate ligand which bind to nickel(II) through the secondary NH functional groups. Electronic spectra showed a transition peak at 25252 cm-1 and 13802 cm-1 which indicating octahedral geometry. The complex was paramagnetic with μeff= 2.99 BM.

Influence of Ni Doping on CuO Nanoparticles Synthesized by Rapid Solid Reaction Method

&lt;P&gt;Object: Copper oxide (CuO) nanoparticles (NPs) and copper oxide doped with various percentage of nickel (Ni) have been successfully prepared using the solid-solid reaction method. &lt;/P&gt;&lt;P&gt; Methods: The obtained powders of these CuO NPs have been calcined at various temperatures of 350&amp;#176;C, 450&amp;#176;C, 550&amp;#176;C and 650&amp;#176;C. These NPs have been characterized by Differential Thermal Analysis (DTA), X-Ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and Fourier Transformation Infrared Spectroscopy (FTIR). &lt;/P&gt;&lt;P&gt; Results: XRD results obtained a pure phase of the as-prepared CuO NPs. The average crystallite size determined from XRD increases with certain calcination temperature. Doping of Ni in CuO NPs is extensively studied. The increase of Ni from 0.5% to 10% causes a decrease in the average crystallite size observed in FESEM studies. Moreover, magnetic properties are investigated for as-prepared CuO, CuO calcined at 650&amp;#176;C, and CuO doped 10% Ni. &lt;/P&gt;&lt;P&gt; Conclusion: The magnetic observations illustrated that, at the maximum applied field of 1.5 kOe, the magnetic response with a maximum moment M &amp;#8804; 0.01 emu/g for CuO NPs is achieved. This could be related to the uncompensated surface spins. Moreover, the magnetic response with a maximum moment is doubled in CuO NPs doped with 10% Ni.&lt;/P&gt;

Effect of pH Change and water Temperature On Nickel Removal from Surface Water by Chemical Precipitation

The research aims to find relationship between indications, change of raw surface water which are: pH, temperature, and optimum doses of alum [Al2(SO4)3.14H2O] to develop a suitable mathematical equation. A series of experiments were performed under different conditions and on different seasonal circumstances to determine the effect of the previous indications on the coagulation efficiency, where we treat Qattinah lake water by Coagulation, Sedimentation then Filtration. We studied the impact of coagulant dose change with the change of pH water within the domain ( 6.5 to 8.5 ) and the percentage of nickel removal was 75 % at pH = 8 , and we studied the effect of coagulant dose change with raw water temperature change ( from 5 to 25) °C on reducing the nickel concentration where the percentage of nickel removed when the temperature 20 °C was up to 85%, and all that when the coagulant dose was 30 mg/l.

استرداد النيكل من مخلفات حرق الوقود في المحطات

تضمن البحث أفضل الطرق الكيميائية والظروف المناسبة لاسترداد النيكل على شكل كبريتات أو اوكسيد من مخلفات حرق الوقود في محطات مياه الصرف الصحي تم دراسة بعض المتغيرات مثل تركيز الحامض المستخدم ، حجم الحامض ، زمن التفاعل والأس الهيدروجيني (pH) على عملية استرداد النيكل من المخلفات بعد استرداد الفناديوم منها . تشير النتائج المستحصلة بأن نسبة النيكل في المخلفات تتراوح بين (3-6) % وتصبح النسبة (8-15) % بعد عمليات استرداد الفناديوم منها . كانت كفاءة عملية استرداد النيكل اكثر من (90) % ونقاوة المادة الناتجة بحدود (98) % .