The Effect of Sodium Silicate Concentration on the Properties of the Coating Formed on Pure Zirconium by Microarc Oxidation Coating Technique

2012 ◽  
Vol 445 ◽  
pp. 637-642 ◽  
Author(s):  
Y. Gencer ◽  
M. Tarakci ◽  
S. Cengiz ◽  
K.O. Gunduz
Keyword(s):  
Surface Roughness ◽  
Sodium Silicate ◽  
Zirconium Oxide ◽  
Microarc Oxidation ◽  
Phase Content ◽  
Oxide Coatings ◽  
Silicate Concentration ◽  
X Ray ◽  
Pure Zirconium ◽  
Scanning Electron

In this study, zirconium oxide coatings were formed on pure zirconium by microarc oxidation technique with the electrolytes containing KOH and different amounts of sodium silicate (0-40 gr/lt) for the same coating duration of 2 hours. The microstructure, surface roughness, phase content and chemical composition of the coatings were characterized by using scanning electron microscopy, profilometery and X-ray diffractometry. It was found that the coatings on surface of zirconium consist of monoclinic ZrO2 (m-ZrO2) and tetragonal ZrO2 (t-ZrO2) phases and the addition and increasing sodium silicate concentration in the electrolyte increases amount of t-ZrO2 phase. The coatings were well adhered to Zr substrate with some cracks and porosities in the coating for all concentrations of sodium silicate. The coating thickness and surface roughness increased with sodium silicate concentration in the electrolyte. A glaze like Si rich structure and its increase with Si rate was evident in the outermost region of the coating.

Histologic and Ultrastructural Analysis in a Case of Massive Failure of Zirconia Ball Head

2002 ◽  
Vol 12 (4) ◽  
pp. 388-393
Author(s):  
G. Maccauro ◽  
L. Petrella ◽  
L. Proietti ◽  
V. De Santis ◽  
C. Piconi
Keyword(s):  
Zirconium Oxide ◽  
Internal Surface ◽  
Giant Cells ◽  
Sem Analysis ◽  
Ultrastructural Analysis ◽  
Periprosthetic Tissue ◽  
X Ray ◽  
Internal Part ◽  
Scanning Electron

The in vivo histological and ultrastructural analysis of periprosthetic tissue collected at time of revision surgery for failure of a 28 mm yttria-tetragonal zirconium oxide polycrystal (YTZP) ball head, 2 years after implantation is reported. Histologic analysis showed Zirconia particles, rounded to polygonal ranging from 2μm to more than 10μm intra or extra cellular in a stroma without vessels with few giant cells. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) showed the different shape from rounded to polygonal of Zirconia. SEM analysis of the internal part of Zirconia ball head showed the presence of different fracture lines especially in the internal surface

THE EFFECT OF TITANIA SOL IN PHOSPHATE ELECTROLYTE ON MICROARC OXIDATION COATINGS ON ALUMINUM ALLOY

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3190-3195 ◽  
Author(s):  
MING QI TANG ◽  
WEI PING LI ◽  
HUI CONG LIU ◽  
LI QUN ZHU
Keyword(s):  
Aluminum Alloy ◽  
Growth Process ◽  
Energy Dispersive Spectrometry ◽  
Microarc Oxidation ◽  
X Ray ◽  
Black Coating ◽  
Titania Sol ◽  
Thickness Meter ◽  
Scanning Electron ◽  
Phosphate Electrolyte

Black and gray microarc oxidation coatings have been obtained on 2A70 Aluminum alloy in phosphate electrolyte with and without titania sol, respectively. The growth process of the microarc oxidation coating in the electrolyte with titania sol was investigated. The coating was characterized by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray. The coating thickness was measured by eddy current thickness meter. The results show that the titania sol increase the growth rate of microarc oxidation coating. In both cases the composition of coatings contain Al and O , and are mainly composed of γ- Al 2 O 3 and AlPO 4. Compared with the gray coating, large amount of Ti is found on the surface of black coating. The titania sol added in the electrolyte results in Ti in the coating, in the form of TiO and Al 2 TiO 5.

scholarly journals Прозрачные фотоактивные ZnO-MgO-Ag-=SUB=-2-=/SUB=-O-покрытия на стеклах

2019 ◽  
Vol 127 (8) ◽  
pp. 292
Author(s):  
С.К. Евстропьев ◽  
Н.В. Никоноров ◽  
В.М. Киселев ◽  
А.C. Саратовский ◽  
Е.В. Колобкова
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Visible Spectral Region ◽  
X Ray Diffraction ◽  
Oxide Coatings ◽  
High Transparency ◽  
X Ray ◽  
Gap Width ◽  
Band Gap Width ◽  
Scanning Electron

AbstractTransparent ZnO–MgO–Ag_2O coatings are formed on glasses by the polymer–salt method, and the optical properties of these coatings are studied. The optical properties of the films are studied by optical spectroscopy and photoluminescence. The structure of the oxide coatings is studied by X-ray diffraction analysis and scanning electron microscopy. It is found that an increase in the silver concentration in the coatings leads to a decrease in the band gap width of the material. It is shown that the films are characterized by a high transparency in the visible spectral region and can generate singlet oxygen under action of UV radiation (370 nm) and blue light (405 nm).

Electrochemical Characteristics of the Amorphous-Nanocrystal Ni–Mo Cathodes in Sodium Hydroxide Solution

2015 ◽  
Vol 667 ◽  
pp. 280-285
Author(s):  
Ning Li ◽  
Jian Meng Huang ◽  
Wei Zeng Chen ◽  
Bin Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrogen Evolution ◽  
Sodium Hydroxide Solution ◽  
Electrochemical Characteristics ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Modern Technologies ◽  
Scanning Electron

The amorphous-nanocrystal Ni-Mo deposits were obtained by electrodeposition in alkaline nickel carbonate solution. X-ray diffraction (XRD), scanning electron microscopy (SEM) and modern technologies were used to describe the content, microstructure and morphology of the deposits. The electrochemical characteristics of Ni-Mo deposits were electrolyzed in 33°C, 7 mol/L NaOH electrolytic solutions. The results showed that when I was 100 mA·cm−2, the hydrogen evolution potential of Ni-Mo21.76 was lower than amorphous Ni-Mo26.36 and 250mV lower than the nanocrystal Ni cathode. And the Ni-Mo deposits with more amorphous phase content would be in lower hydrogen evolution overpotential, a higher exchange current density, and a better electrolytic stability. These due to the amorphous combined with nanocrystal, lager contact surface and binding energy of Ni-Mo structure.

Biocompatibility Research of Medicine Titanium Alloy Coating by Microarc Oxidation

2011 ◽  
Vol 189-193 ◽  
pp. 222-226
Author(s):  
Feng Biao Wang ◽  
Shi Chun Di ◽  
Jie Yu
Keyword(s):  
Titanium Alloy ◽  
Body Fluid ◽  
Oxidation Process ◽  
Microarc Oxidation ◽  
Alloy Coating ◽  
P Value ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Morphologies ◽  
Scanning Electron

A medicinal titanium alloy hydroxyapatite coating was fabricated by microarc oxidation process, and a kind standard of simulated body fluid was configured, after that the biocompatibility experiment was carried out. The soaked coatings surface morphologies were observed and analysed by scanning electron microscopy,and the coating spectra were simultaneityly researched by X-ray diffraction. The instance of degradation and precipitate were investigated,and the transformation of Ca/P value were measured.

Er,Cr:YSGG laser surface treatment of gamma titanium aluminide: Scanning electron microscopy–energy-dispersive X-ray spectrometer analysis, wettability and Eikenella corrodens and Aggregatibacter actinomycetemcomitans bacteria count—in vitro study

2020 ◽  
Vol 234 (8) ◽  
pp. 769-783
Author(s):  
Maryam Koopaie ◽  
Ali Kia Darbandsari ◽  
Neda Hakimiha ◽  
Sajad Kolahdooz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Roughness ◽  
Surface Treatment ◽  
Laser Surface ◽  
Energy Dispersive ◽  
Laser Surface Treatment ◽  
Eikenella Corrodens ◽  
X Ray ◽  
Scanning Electron

Dental implants play an important role in oral health. Titanium dental implants must endure the complex microflora environment of the oral cavity. Moreover, bacterial infections have been considered as one of the most important factors of implant failure. The issue of dental improvement through modification of chemical composition and surface treatment has received considerable critical attention. γ-TiAl as a novo biocompatible material revealed a slower corrosion rate in biological media rather Ti-6Al-4V. The objective of this study is to investigate the effect of Er,Cr:YSGG laser on γ-TiAl in comparison with sandblasted and acid-etched samples as the control groups and machined samples. Wettability, surface roughness, surface topography, scanning electron microscopy–energy dispersive X-ray spectrometer analysis of surface and subsurface of samples were investigated and bacteria counts of two periodontal bacterial strains ( Aggregatibacter actinomycetemcomitans and Eikenella corrodens) were evaluated on the Er,Cr:YSGG laser surface-treated sandblasted and acid-etched and machined samples. The results of this investigation show that Er,Cr:YSGG laser surface treatment affects surface roughness, surface topography, wettability, chemical composition of the surface and bacteria count. Scanning electron microscopy–energy dispersive X-ray spectrometer analysis of the sample revealed the increment of titanium and oxygen content and reduction of aluminum content in the surface and subsurface layer. A. actinomycetemcomitans and E. corrodens count were found from the lowest level to highest in the sandblasted and acid-etched samples, laser samples and machined samples, respectively. Using controlled parameters of Er,Cr:YSGG laser ensured no significant adverse alteration. The findings to emerge from this study revealed the significant correlation between microbial count and wettability. Furthermore, the contact angle strongly correlated with surface roughness.

scholarly journals Modification of Surface Roughness and Area of FeCrAl Substrate for Catalytic Converter using Ultrasonic Treatment

2012 ◽  
Vol 1 (2) ◽  
pp. 53-60
Author(s):  
Yanuandri Putrasari ◽  
P Untoro ◽  
Sulaiman Hasan ◽  
Naili Huda ◽  
Darwin Sebayang
Keyword(s):  
Surface Roughness ◽  
Electron Microscope ◽  
Ultrasonic Treatment ◽  
Catalytic Converter ◽  
Ultrasonic Method ◽  
Chemical Components ◽  
X Ray ◽  
Atomic Force ◽  
Scanning Electron ◽  
Better Than

Surface roughness and area play important role especially in deposition and reaction of the catalyst in the catalytic converter substrate. The aim of this paper is to show the modification of surface roughness and area of FeCrAl substrate for catalytic converter using ultrasonic method. The method was conducted by agitating the FeCrAl in 10 minutes 35 kHz ultrasonic cleaning bath. The  surface roughness, morphology, and chemical components of FeCrAl catalytic converter substrate after ultrasonic treatment were analyzed using atomic force microscope (AFM) and examined with scanning electron microscope (SEM) in combination with energy dispersive X-ray spectroscopy (EDS). The ultrasonic treatment assisted with Al2O3 powders successfully increased the roughness and surface area of FeCrAl better than SiC powders. 

Benefeciation of Derived Bovine Bone Waste Hydroxyapatite Obtained from Meatballs Sellers and its Characterization

2015 ◽  
Vol 1123 ◽  
pp. 155-159 ◽  
Author(s):  
Dwi Asmi
Keyword(s):  
Electron Microscopy ◽  
Bovine Bone ◽  
Phase Content ◽  
X Ray Diffraction ◽  
Content Type ◽  
X Ray ◽  
Carbonate Ions ◽  
Morphologic Characteristics ◽  
Thermal Stability Of ◽  
Scanning Electron

In this study, bovine bone waste obtained from meatballs sellers was utilized as novel alternative bioresource of hydroxyapatite (HA). The femur bovine bone waste in bulk form was initially deproteinized using HCl and NaOH and then followed by calcination at 500 °C and 800 °C for 5 h to obtained HA powder. The thermal stability of HA powder was monitored using simultaneous thermogravimetric analysis (TG) and differential thermal analysis (DTA). The TG/DTA result shows that the combustion of the organic component of bone, especially of collagen occured at temperature range of 174-550 °C. The phase content, type of bond present, and morphology of calcined HA powder were conducted using x-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) respectively. The crystallinity of the HA sample shows increase with increasing of the temperature calcination. The characteristic of bands of HA and additionally peaks of carbonate ions were observed in the FTIR results and the morphologic characteristics of the HA particles shows the material is a homogeneous powder.

scholarly journals Influence of Successive Chemicals and Thermochemical Treatments on Surface Features of Ti6Al4V Samples Manufactured by SLM

2021 ◽  
Author(s):  
Jesús E. González ◽  
Gabriela de Armas ◽  
Jeidy Negrin ◽  
Ana M. Beltrán ◽  
Paloma Trueba ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Acid Treatment ◽  
Thermochemical Treatment ◽  
Chemical Oxidation ◽  
Effect Of Temperature ◽  
Acid Etching ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
X Ray ◽  
Scanning Electron

Ti6Al4V samples obtained by selective laser melting were subjected to acid treatment, chemical oxidation in hydrogen peroxide solution and subsequent thermochemical treatment. The effect of temperature and time of acid etching of Ti6Al4V samples on surface roughness, morphology, topography and chemical and phase composition after the thermochemical treatment was studied. The surfaces were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and contact profilometry. Pore and protrusion sizes were measured. Acid etching modified the elemental composition and surface roughness of the alloy. Temperature had a greater influence on the morphology, topography and surface roughness of samples than time. Increases in roughness values were observed when applying successive chemical oxidation and thermochemical treatment compared to the values observed on surfaces with acid etching. After the thermochemical treatment, the samples with acid etching at a temperature of 80 °C showed a multiscale topography. In addition, a network-shaped structure was obtained on all surfaces, both on their protrusions and pores previously formed during the acid etching.

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