scholarly journals Electrophoretic Deposition of 45S5 Bioglass® Coatings on the Ti6Al4V Prosthetic Alloy with Improved Mechanical Properties

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1192
Author(s):  
Imen Azzouz ◽  
Joël Faure ◽  
Kaouther Khlifi ◽  
Ahmed Cheikh Larbi ◽  
Hicham Benhayoune
Keyword(s):  
Mechanical Properties ◽  
Electrophoretic Deposition ◽  
Scratch Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stable Suspension ◽  
Test Study ◽  
Before And After ◽  
Titanium Alloy Ti6al4v ◽  
45S5 Bioglass

In this paper, 45S5 Bioglass® coatings were elaborated by electrophoretic deposition (EPD) on the titanium alloy Ti6Al4V. An adequate grinding protocol was developed to obtain a stable suspension of submicrometric particles in isopropanol. The voltage and the deposition time of EPD were optimized. An optimal voltage of 30 V and two deposition times (30 and 90 s) were chosen to obtain two different coatings with thicknesses of 21 and 85 µm, respectively. The as-deposited coatings were thermally treated following a two-step protocol: one hour at 120 °C followed by one hour at 450 °C. The surface morphology and the chemical analysis of the 45S5 Bioglass® coatings were assessed, before and after heat treatment, by scanning electron microscopy associated to X-ray microanalysis (SEM-EDXS). Their structural analysis was performed by X-ray diffraction (XRD). A scratch test study was developed for mechanical properties analysis. The obtained results revealed that the obtained coatings were homogeneous, weakly crystallized with an important compactness. An increase in the critical load LC associated with the cohesive limit of the film (from Lc = 3.39 N to Lc = 5.18 N) was observed when the coating thickness was decreased from 85 to 21 µm. After the thermal treatment, the chemical composition of the coatings was not altered, and their mechanical properties were improved.

scholarly journals Electrophoretic Deposition of Aluminum Nitride from Its Suspension in Acetylacetone Using Iodine as an Additive

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Bizuneh Workie ◽  
Brian E. McCandless ◽  
Zewdu Gebeyehu
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Deposition Potential ◽  
Linear Increase ◽  
Initial Increase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ftir Studies ◽  
Composition And Structure ◽  
Before And After

We have studied electrophoretic deposition of AlN from its suspension in acetylacetone with I2as an additive. AlN powder with particle size <10 μm is dispersed to produce a positive charge and deposited on the cathode by applying fields greater than 10 V/cm between the electrodes. X-ray diffraction and FTIR studies indicate that the AlN before and after deposition has the same composition and structure. An increase in the amount of AlN in the suspension, the deposition potential, and the deposition time results in a linear increase in the weight of the AlN deposited. Electrophoretic deposition from 10 g/L AlN suspension shows an initial increase in the weight of AlN deposited with the concentration of I2, and the weight of AlN decreases after reaching a maximum at 0.20 g/L I2.

The Influence of Mineralogical Composition Changes of Sandstone Cement on Physical-Mechanical Properties

2014 ◽  
Vol 923 ◽  
pp. 71-74
Author(s):  
Kateřina Kovářová ◽  
Zdenek Pala
Keyword(s):  
Mechanical Properties ◽  
Mineralogical Composition ◽  
Winter Period ◽  
Climatic Chamber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Weathering Processes ◽  
Road Salts ◽  
Before And After ◽  
Composition Changes

The aim of the contribution is to present the results of research focused on cement mineralogical composition changes and their influence on physical-mechanical properties of sandstones. Three types of Czech sandstones were tested during this experiment Hořice, Kocběře and Božanov. The sandstone samples were treated in the climatic chamber in order to simulate weathering processes that are typical for winter period in Prague. The influence of road salts was also taken into consideration. For the purposes of mineralogical changes determination the sandstone cement was separated and subsequently analyzed using X-Ray diffraction a DTA/TG analysis. The physical-mechanical properties such as e.g. uniaxial compressive strength, water absorption and open porosity were determined before and after the climatic treatment to enable evaluation of the influence of weathering processes.

scholarly journals Structure and Properties of ZrON Coatings Synthesized by Cathodic Arc Evaporation

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1483
Author(s):  
Alexander S. Kuprin ◽  
Adam Gilewicz ◽  
Tatyana A. Kuznetsova ◽  
Vasilina A. Lapitskaya ◽  
Galina N. Tolmachova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxygen Concentration ◽  
Strong Dependence ◽  
Scratch Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Yellow ◽  
Cathodic Arc Evaporation ◽  
Arc Evaporation ◽  
Cathodic Arc

The transition metal oxynitrides are a coating material with decorative features due to their adjustable color and good mechanical properties. The purpose of the research was to study the effect of the relative oxygen concentration O2(x) = O2/(N2 + O2) in particular on adhesion, but also on the color, structural and mechanical properties of ZrON coatings synthesized by cathodic arc evaporation on HS6-5-2 steel substrates. The surface morphology, phase and chemical composition and mechanical properties were determined using scanning electron microscopy, X-ray diffraction, wavelength dispersive X-ray spectroscopy, nanoindentation and scratch test. It was found that color of the coatings changed from light yellow for ZrN first to gold and then to graphite for Zr-O phase with increase of oxygen concentration. X-ray diffraction patterns showed that the phase separation of ZrN and ZrO2 occurred for about 35 at.% of oxygen in the coating. Increase in oxygen concentration in the coatings led to decrease in crystallite size from about 20 nm for ZrN to about 5 nm for coatings with about 35 at.% of oxygen and about 25 at.% of nitrogen. An increase in hardness from about 26 GPa for ZrN to about 30 GPa for coating with small concentration of oxygen (about 9 at.%) and then decrease to about 15 GPa was observed. Adhesion of Zr-O-N coatings demonstrated strong dependence on oxygen concentration. Critical load for ZrN is about 80 N and decreases with oxygen concentration increase to about 30 N for ZrO2.

Microstructure and Mechanical Properties of AISI 8620 Steel Processed by ECAP

2014 ◽  
Vol 1611 ◽  
pp. 89-94
Author(s):  
Diana M. Marulanda ◽  
Jair G. Cortés ◽  
Marco A. Pérez ◽  
Gabriel García
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Equivalent Strain ◽  
Sem Analysis ◽  
Structure Evolution ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angular Pressing ◽  
Before And After

ABSTRACTThe aim of this work is to process by equal channel angular pressing (ECAP) a low carbon – triple-alloyed steel containing 0.2% C, 0.5% Cr, 0.6% Ni, 0.2% Mo and 0.8 Mo. The process is performed at room temperature for up to four passes using route Bc with an equivalent strain of ∼0.6 after a single pass. Structure evolution before and after deformation is studied using scanning electron microscopy (SEM) and x-ray diffraction (XRD) and mechanical properties are assessed by microhardness and tensile testing. A significant improvement of the mechanical properties is found with increasing number of ECAP passes. Micro-hardness increases from 216 HV for the initial sample to 302 HV after four passes and tensile strength increases to 1200 MPa compared with 430 MPa prior to ECAP. X-ray diffraction and SEM analysis show changes in the original ferritic-perlitic structure through ferrite grain refinement and the deformation of perlite. This nickel-chromium-molybdenum alloy is used in manufacturing as gear material, and when it is hardened and formed through carburizing or boronizing it can be used to make hard-wearing machine parts. However, the ECAP process has not been used to harden this steel and to change its structure to obtain better mechanical performance.

Electrophoretic deposition of α-alumina particles in a strong magnetic field

2003 ◽  
Vol 18 (2) ◽  
pp. 254-256 ◽  
Author(s):  
Tetsuo Uchikoshi ◽  
Tohru S. Suzuki ◽  
Hideo Okuyama ◽  
Yoshio Sakka
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Electrophoretic Deposition ◽  
Diamagnetic Susceptibility ◽  
Aqueous Media ◽  
X Ray Diffraction ◽  
Single Crystalline ◽  
X Ray ◽  
Stable Suspension ◽  
Alumina Particles

The electrophoretic deposition of single-crystalline α-alumina particles dispersed in aqueous media was performed in a strong magnetic field of 10 T. The α-alumina particles in the stable suspension were aligned due to their anisotropic diamagnetic susceptibility and then deposited on a cathodic substrate. The orientation of the α-alumina crystallites was confirmed by x-ray diffraction of the sintered specimen.

Effect of Substrate Temperature on Structure and Mechanical Properties of ZrN Coatings

2010 ◽  
Vol 154-155 ◽  
pp. 1664-1667
Author(s):  
Zheng Bing Qi ◽  
Ruo Xuan Huang ◽  
Fang Ping Zhu ◽  
Peng Sun ◽  
Zhou Cheng Wang
Keyword(s):  
Mechanical Properties ◽  
Substrate Temperature ◽  
Nitrogen Loss ◽  
Scratch Test ◽  
Columnar Structure ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
X Ray ◽  
Zro2 Phase ◽  
Coating Hardness

The effect of deposition temperature on microstructure and mechanical properties of ZrN coatings fabricated by DC magnetron sputtering was investigated. X-ray diffraction, scanning electron microscope, nanoindentation and scratch test were applied to characterize the ZrN coatings. The results show that with the increasing of substrate temperature the preferred orientation of the coating changed from (111) to (200), the ZrN crystalline phase almost disappeared at 600 resulting from nitrogen loss and the formation of ZrO2 phase. From 50 to 450 , the coatings showed columnar structure, and at 600 the columnar disappeared, presenting equiaxed structure instead. The hardness of coatings showed few significant variations under 450 , and at 600 the coating hardness dropped for the low crystallinity and ZrO2 phase softening. The substrate-coating adhesion decreased with the increasing of temperature before 450 , and then followed by an elevation at 600 .

Flame Retardant Protective Coating Applied in Textile 100% Acrylic Fabrics

2009 ◽  
Vol 1242 ◽  
Author(s):  
M. Olvera-Gracia ◽  
T. Kryshtab ◽  
A.M. Paniagua-Mercado ◽  
J. Aguilar-Hernández
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardants ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Textile Fabrics ◽  
Infra Red ◽  
Before And After ◽  
Long Time

ABSTRACTTextile 100 % acrylic fabrics have been used in tapestry for a long time. One of the drawbacks of this type of fabrics is its great flammability. Textile fabrics are coated with flame retardant in order to reduce the flammability. We present some results concerning the use of commercial products (Flame-Out, Borax (Na2B4O5(OH)4•8H2O), and Hexametaphosphate of Sodium (Na16P14O43) as flame retardants for textile 100 % acrylic fabrics. The flame retardant capabilities, mechanical properties and structural characteristics of the textile fabrics before and after the use of these products were investigated throughout the special textile methods for inflammability and mechanical resistibility as well as infra-red spectroscopy, X-ray diffraction and scanning electronic microscopy. After the use of the flame retardants the mechanical properties of the fabrics were improved or at least remained the same as compared to fabrics without any treatment. The use of Borax / Hexametaphosphate from Sodium /Water results in the essential increase of combustion retardation time about 2 minutes as compared with 8 seconds for untreated fabrics.

Evaluation of Freezing Methods by Low Temperature X-Ray Diffraction

1977 ◽  
Vol 35 ◽  
pp. 330-333
Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello
Keyword(s):  
Biological Materials ◽  
Molecular Organization ◽  
X Ray Diffraction ◽  
Glass Capillary ◽  
X Ray ◽  
Rate Dependent ◽  
Before And After ◽  
Freeze Etching ◽  
Diffraction Patterns ◽  
Set Up

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

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