scholarly journals Production and Characterization Of Electroless Ni Coated Fe-Co Composite Using Powder Metallurgy In Microwave Furnace

2021 ◽  
Author(s):  
Assoc. Prof. Dr. Ahmet YONETKEN
Keyword(s):  
Structural Data ◽  
Metallic Phase ◽  
Neutral Atmosphere ◽  
X Ray Diffraction ◽  
Electroless Coating ◽  
Microwave Furnace ◽  
Furnace Sintering ◽  
Atmosphere Environment ◽  
Electroless Ni

Abstract The specimens, magnetic properties materials, and microwave characteristics of Ni coated Fe and Co composites were researched by specimens produced by microwave furnace sintering at 1100°C temperature. A uniform nickel deposit on Fe-Co particles was coated previously to sintering by electroless coating deposition procedure. A composite consisting of quaternary additions, a metallic phase, Fe-Co inside of Ni matrix has been prepared under in a neutral atmosphere environment then microwave sintered. X-Ray Diffraction, SEM(Scanning-Electron-Microscope), Empedans Phase Analyzer were utilized to obtain structural data and to determine magnetic and electrical features such as dielectric and conductivity at the temperature range of 25-400C. The ferromagnetic resonance varied from 10 Hz to 1GHz and measurements were employed to characterize the features of the specimens. Empirical of findings obtained for the composition (Fe-%25Co)50Ni at 1100°C recommend that the best conductivity and hardness were obtained with 50Ni addition at a sintering temperature of 1100°C.

Tribocorrosion behavior of electroless Ni-P/Ni-B duplex coating on AA7075 aluminum alloy

2019 ◽  
Vol 71 (5) ◽  
pp. 630-635 ◽  
Author(s):  
Harun Mindivan
Keyword(s):  
Aluminum Alloy ◽  
Surface Characterization ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Content Type ◽  
Duplex Coating ◽  
Scanning Electron Microscopic ◽  
Electroless Ni ◽  
Insight Into

Purpose This paper aims to investigate the structural, corrosion and the study of tribocorrosion features of the AA7075 aluminum alloy with and without the application of electroless Ni-P/Ni-B duplex coating with a thickness of approximately 40 microns. Design/methodology/approach Surface characterization of the samples was made by structural surveys (light optic microscope, scanning electron microscopic examinations and X-ray diffraction analyses), hardness measurements, corrosion and tribocorrosion tests. Findings Results of the experiments showed that upper Ni-B coating deposited on the surface of first Ni-P layer by duplex treatment caused remarkable increment in the hardness, corrosion resistance and tribocorrosion performance as compared to the AA7075 aluminum alloy. Originality/value This study can be a practical reference and offers insight into the effects of duplex treating on the increase of hardness, corrosion and tribocorrosion performance.

Wear Performance Optimization for Electroless Ni-P Coating

2015 ◽  
Vol 3 (2) ◽  
pp. 1-17 ◽  
Author(s):  
Prasanta Sahoo ◽  
Suman Kalyan Das
Keyword(s):  
Performance Optimization ◽  
System Response ◽  
X Ray Diffraction ◽  
Wear Performance ◽  
X Ray ◽  
Nodular Structure ◽  
Coating Morphology ◽  
Electroless Ni ◽  
Significant Factors

Optimization of the wear performance of electroless Ni-P coating is carried out with the help of Taguchi orthogonal array design. Tribological testing parameters (applied load, sliding speed and duration of testing) are optimized with the help of L27 array in order to get the best wear performance from the coating. Load and time were found to be the most significant factors. Interaction between load and time is also found to hold some amount of significance towards the system response (wear). The characterization of the coating is carried out through scanning electron microscopy, energy dispersive X-ray analysis and X-ray diffraction analysis. The coating morphology is found to resemble a nodular structure and the coating is mainly amorphous in as deposited state. However, post heat treatment at 400ºC for one hour the coating transforms into crystalline structure. The wear mechanism is also studied and found to be a mixture of abrasive and adhesive wear phenomena.

Synthesis and Electrochemistry of Aluminum Porphycenes: Crystal and Molecular Structure of Methyl-σ-Bonded Aluminum Etioporphycene

1997 ◽  
Vol 01 (02) ◽  
pp. 109-119 ◽  
Author(s):  
ROGER GUILARD ◽  
VIRGINIE PICHON-PESME ◽  
HASSANE LACHEKAR ◽  
CLAUDE LECOMTE ◽  
ALLY M. AUKAULOO ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
Structural Data ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Axial Ligands ◽  
Uv Visible

The synthesis and characterization of three monomeric aluminum porphycenes with anionic or σ-bonded axial ligands is reported. The investigated compounds are represented as ( EtioPc ) Al ( CH 3) and ( EtioPc ) AlX where EtioPc represents the dianion of etioporphycene and X = Cl − or OH −. Each synthesized complex was characterized by mass spectrometry. 1 H NMR, IR and UV-visible spectroscopies as well as by electrochemistry. Comparisons are made between the properties of complexes in the aluminum etioporphycene series and related chloro- or methyl σ-bonded Al ( III ) porphyrins containing octaethylporphyrin ( OEP ) or tetraphenylporphyrin ( TPP ) macrocycles. Comparisons are also made between the currently investigated compounds and a previously reported Al ( III ) μ-oxo dimer, [( EtioPc ) Al ]2 O . In addition, the crystal and molecular structure of ( EtioPc ) Al ( CH 3) was determined by X-ray diffraction. The molecular structure of this methyl-σ-bonded aluminum etioporphycene provides the first structural data for an aluminum porphycene compound. The aluminum(III) atom in ( EtioPc ) Al ( CH 3) is pentacoordinated and is located 0.54 Å from the plane of the four N -nitrogens.

scholarly journals Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

2018 ◽  
Vol 12 (2) ◽  
pp. 123-128 ◽  
Author(s):  
Yildiz Kafkaslioğlu ◽  
Hüseyin Yilmaz ◽  
Yahya Tür
Keyword(s):  
Fracture Toughness ◽  
Metallic Phase ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Bending Tests ◽  
Three Point Bending ◽  
Green Strength ◽  
Nanocomposite Powders ◽  
Hardness Values

Al2O3/Ni and Al2O3/Co nanopowder mixtures (with 3 vol.% of metallic phase) were synthesized by heterogeneous precipitation method. In order to increase the green strength, polypropylene carbonate (PPC) was used as a binder while preparing green compacts. Uniaxially pressed powder mixtures were sintered at 1550?C for 2 h in a reducing atmosphere. The effects of Ni and Co nanophases on the microstructure and mechanical properties of Al2O3 ceramics were studied by X-ray diffraction, scanning electron microscopy, Vickers indentation technique and three-point bending tests. The metallic phase hindered the densification of alumina matrix, yet hardness values of Al2O3, Al2O3/Ni, and Al2O3/Co composites were comparable. Vickers fracture toughness results indicate that the composites have higher fracture toughness, but the characteristic flexural strength and Weibull modulus are higher for the pure Al2O3.

Structural Characterization of Bis[N-(o-Hydroxybenzyl-(S)-Leucinato)]cobaltate(III) Anion. Tyrosine-Like Model Complex with Structurally Inequivalent Chelate Rings

1996 ◽  
Vol 61 (12) ◽  
pp. 1754-1766
Author(s):  
Svetlana Pakhomova ◽  
Jan Ondráček ◽  
František Jursík
Keyword(s):  
Structural Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bond Lengths ◽  
Model Complex ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Average Bond ◽  
C Nmr

[Co(NH3)4(H2O)2]OH . [Co(ohb-(S)-Leu)2] . 2 H2O (ohb, o-hydroxybenzyl) was characterized by single-crystal X-ray diffraction which shows that both ligands in the [Co(ohb-(S)-Leu)2]- anion assume facial coordination mode with all donor atoms trans to each other, proposed on the basis of UV-VIS and 13C NMR spectroscopy, with R,S configuration of secondary N atoms. Compound crystallizes in the tetragonal space group I41 with unit cell dimensions a = 22.173(7), c = 13.270(2) Å, V = 6 524 Å3, Z = 4. Structural data show that both ligands are not equivalent. Bond angles and bond lengths depend on whether secondary N atoms adopt R or S configuration. The average bond lengths are shorter when the ohb-(S)-Leu ligand coordinates with (N)R configuration.

Synthesis and characterization of microinductor made of NiCuZn nanoferrite

2015 ◽  
Vol 29 (29) ◽  
pp. 1550176 ◽  
Author(s):  
Sontosh Kumar ◽  
W. Madhuri ◽  
S. Kalainathan
Keyword(s):  
Mechanical Stress ◽  
Magnetic Semiconductors ◽  
Sol Gel ◽  
Applied Pressure ◽  
Ferrite Powder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stress Sensors ◽  
Microwave Furnace

The objective of mechanical stress sensor is to measure the applied pressure or provide control standard to the process. In order to accomplish this, most of the stress sensors convert mechanical stress into electronic signal. Ferrites are the best known magnetic semiconductors. This paper brings out the variation in inductance of the micro-inductor made from [Formula: see text] on application of mechanical stress. [Formula: see text] ferrite nanoparticles are synthesized by sol–gel autocombustion technique. The ferrite powder thus obtained is double sintered at 450[Formula: see text]C and 870[Formula: see text]C in a microwave furnace. The X-ray diffraction pattern of the ferrite confirms spinal structure. The frequency spectrum of dielectric constant is done in the range of 100 to 5 MHz frequency. The variation of inductance [Formula: see text]% with applied compressive stress on the micro-inductor made from the ferrite is measured in the range of 0–8 MPa.

Tribological Characterization of Electroless Ni–B Coatings Formed on Commercial Purity Magnesium

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
E. Correa ◽  
J. F. Mejía ◽  
J. G. Castaño ◽  
F. Echeverría ◽  
M. A. Gómez
Keyword(s):  
Sliding Wear ◽  
Parametric Optimization ◽  
Commercial Purity ◽  
Electroless Coating ◽  
Friction Testing ◽  
Wear And Friction ◽  
Electroless Coatings ◽  
Tribological Characterization ◽  
Electroless Ni

Ni–B coatings have been deposited directly on commercial purity magnesium and evaluated by means of sliding wear and friction testing. The nickel and boron are distributed throughout the whole thickness of the coating. Parametric optimization has been carried out using the design of experiment based on Taguchi analysis. The friction coefficients of the coatings vary between 0.01 and 0.3, depending on the evaluated conditions. The lowest wear rate of the coating was 0.19 × 10−5 mm3 N−1 m−1. Wear and friction coefficient maps of Ni–B electroless coatings formed on magnesium surfaces are reported. Nanoparticles present in the lubricating fluid act as a third wear body increasing the wear of the electroless coating

Synthesis and characterization of PbBaGeO4

2015 ◽  
Vol 70 (6) ◽  
pp. 435-440 ◽  
Author(s):  
Lucas L. Petschnig ◽  
Hubert Huppertz
Keyword(s):  
Spectroscopic Data ◽  
Barium Carbonate ◽  
Structural Data ◽  
Structure Type ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Raman Spectroscopic

AbstractPbBaGeO4 was prepared by high-temperature solid-state synthesis at 900 °C in a platinum crucible from lead(II) oxide, barium carbonate, and germanium(IV) oxide. This compound crystallizes with the BaNdGaO4 structure type in the orthorhombic space group P212121 (no. 19). The structure was refined from single-crystal X-ray diffraction data: a = 1021.6(2), b = 763.4(2), c = 618.1(2) pm, V = 482.1(2) Å3, and residuals of R1 = 0.0373 and wR2 = 0.0730 for all data. Next to structural data, Raman spectroscopic data of PbBaGeO4 are reported.

scholarly journals ARQUEOMETRIA APLICADA À CONSERVAÇÃO DO PATRIMÔNIO ARQUEOLÓGICO METÁLICO: UM ESTUDO DE CASO DO SÍTIO FUNERÁRIO DE SÃO GONÇALO GARCIA, RIO DE JANEIRO

2018 ◽  
Vol 15 (30) ◽  
pp. 290
Author(s):  
Guadalupe Do Nascimento Campos ◽  
Marcus Granato ◽  
Antonieta Middea ◽  
Ricardo Tadeu Lopes
Keyword(s):  
Rio De Janeiro ◽  
Metallic Phase ◽  
X Ray Diffraction ◽  
Archaeological Heritage ◽  
X Ray ◽  
Naked Eye ◽  
Archaeological Objects ◽  
Scanning Electron

O presente trabalho apresenta alguns dos resultados obtidos no âmbito do projeto de pesquisa Conservação e Caracterização Microanalítica de Objetos Arqueológicos Metálicos, desenvolvido no Museu de Astronomia e Ciências Afins - MAST. O projeto tem como objetivo principal estabelecer metodologias de caracterização e conservação do patrimônio arqueológico metálico. Os artefatos selecionados para o estudo de caso são provenientes do Sítio Funerário da Igreja São Gonçalo Garcia (região central do Rio de Janeiro), relacionados aos séculos XVIII e XIX. Para os exames arqueométricos, foram empregadas as seguintes técnicas de caracterização: radiografia digital e microtomografia computadorizada de raios X, microscopias estereoscópica e eletrônica de varredura, espectroscopia de energia dispersiva (MEV/EDS) e difratometria de raios X. Foram obtidas informações sobre a composição dos artefatos (fase metálica e alguns produtos de corrosão), detalhes da morfologia em 3D não visíveis a olho nu, extensão da mineralização, dentre outros aspectos.  Abstract: This paper presents some of the achieved results in the "Microanalytical Conservation and Characterization of Metallic Archaeological Objects" research project, developed at the Museum of Astronomy and Related Sciences - MAST. The project's main goal is to establish methodologies for characterization and conservation of the metallic archaeological heritage. The artifacts selected for the case study are from the Funeral Site at São Gonçalo Garcia's Church (Rio de Janeiro's central region), related to the 18th and 19th centuries. For the archaeometric examinations, the following characterization techniques were employed: digital radiography and X ray microtomography, stereoscopic and scanning electron microscopy, energy-dispersive X ray spectroscopy (SEM / EDS) and X ray diffraction. Results were obtained about the artifacts's composition (metallic phase and some corrosion products), 3D morphology details invisible to the naked eye, and the extent of the mineralization, among other aspects.

Production and wear property of electroless Ni-plated B4C-AstaloyCr-M composites

2015 ◽  
Vol 22 (3) ◽  
pp. 251-255
Author(s):  
Ahmet Yonetken ◽  
Şükrü Talaş ◽  
Ayhan Erol ◽  
Ömer Gökoğlan ◽  
Taner Mersin
Keyword(s):  
Xrd Analysis ◽  
Wear Property ◽  
X Ray Diffraction ◽  
Ceramic Phase ◽  
X Ray ◽  
Conventional Furnace ◽  
Sem Study ◽  
Furnace Sintering ◽  
Compressive Testing ◽  
Electroless Ni

AbstractNickel (Ni) matrix reinforced with boron carbide (B4C) has been produced by conventional furnace sintering at various temperatures. A uniform Ni layer on B4C powders was deposited prior to sintering using electroless plating technique, allowing close surface contact between particles. A composite consisting of quaternary additions, a ceramic phase, B4C, within a matrix of Ni and AstaloyCr-M powders has been prepared at a temperature range of 1000°C–1200°C under Ar shroud. X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) study, compressive testing, and hardness measurements were employed to characterize the properties of the composite. Experimental results showed that the best properties as compressive strength σmax and hardness (HB) were obtained at 1150°C. Wear resistance was relatively higher than cast iron.

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