The Influences of Frequency on the Fabrication and Structural Studies of Micro-Arc Oxidization Ceramic Films Formed on Pure Titanium

2017 ◽  
Vol 727 ◽  
pp. 977-984
Author(s):  
Lin Xu ◽  
Cong Wu ◽  
Xiao Jing Xu ◽  
Bo Quan Li ◽  
Xiao Ya Niu ◽  
...  
Keyword(s):  
Mixed Crystal ◽  
Pure Titanium ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Film ◽  
Ceramic Films ◽  
Micro Arc Oxidation ◽  
Porous Oxide ◽  
3D Profilometer

The porous oxide TiO2 ceramic film containing Ca and P is fabricated on the surface of pure titanium in the electrolyte of C4H6CaO4-NaH2PO4 by micro-arc oxidation (MAO) method. The microscopic structure, elemental composition and phase components of Ceramic Film are studied with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), 3D profilometer and etc. Results indicate that the ceramic film on pure titanium by micro-arc oxidation is a porous mixed crystal structure which contains anatase TiO2 and rutile TiO2, and that the film is mainly composed of such elements as Ti, O, Ca and P. With frequency increasing, the number of micropores increases, the hole is decreased in diameter, porosity and roughness,and the surface is more smooth. The increase of frequencies makes the ratio of Ca/P decrease, the relative content of anatase TiO2 increase and rutile TiO2 decrease.

The Effect of Oxidized Time to Structure and Composition of Micro-Arc Oxidization Ceramic Coating of Pure Titanium

2016 ◽  
Vol 852 ◽  
pp. 984-991
Author(s):  
Lin Xu ◽  
Jian Ning Ding ◽  
Zhen Huang ◽  
Ni Na Han ◽  
Xiao Jing Xu ◽  
...  
Keyword(s):  
Ceramic Coating ◽  
Pure Titanium ◽  
Relative Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Opposite Trend ◽  
Micro Arc Oxidation ◽  
Porous Oxide ◽  
3D Profilometer ◽  
Scanning Electron

The porous oxide TiO2 ceramic coating containing Ca and P is fabricated on the surface of pure titanium in the electrolyte of C4H6CaO4-NaH2PO4 by micro-arc oxidation (MAO) method. Scanning electron microscopy (SEM) and 3D profilometer are used to observe difference between morphology of coating surface under condition of different oxidized time. Energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) are used to discuss the effect of oxidized time to the ratio of Ca/P and phase composition of ceramic coating. Results indicate that the oxidized time has a little effect on structure and composition of MAO ceramic coating of pure titanium. After modified with MAO, pure titanium is rough and porous on its surface, its average aperture, porosity and roughness enlarge as oxidized time extends. The increase of oxidized time makes the ratio of Ca/P and the relative content of rutile TiO2 increases, but the relative content of anatase TiO2 shows opposite trend.

The Effect of Current Density to Surface Morphology and Component of Micro-Arc Oxidization Ceramic Coating of Pure Titanium

2016 ◽  
Vol 852 ◽  
pp. 992-999 ◽  
Author(s):  
Lin Xu ◽  
Jian Ning Ding ◽  
Zhen Huang ◽  
Ni Na Han ◽  
Xiao Jing Xu ◽  
...  
Keyword(s):  
Current Density ◽  
Mixed Crystal ◽  
Ceramic Coating ◽  
Pure Titanium ◽  
Film Surface ◽  
X Ray Diffraction ◽  
Average Pore ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
3D Profilometer

The ceramic coating containing anatase TiO2 and rutile TiO2 is fabricated on the surface of pure titanium in the electrolyte of C4H6CaO4-NaH2PO4 by micro-arc oxidation (MAO) method. The effect of different current density to microscopic structure, elemental composition and phase components of Ceramic Coating are studied with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), 3D profilometer and etc. Results indicate that the ceramic coating on pure titanium by micro-arc oxidation is a porous mixed crystal structure which is mainly composed of such elements as Ti, O, Ca and P. With current density increasing, the average pore diameter and roughness on film surface first increase and then decrease, the porosity increases, the ratio of Ca/P then decreases, the relative content of anatase TiO2 increases and that of rutile TiO2 decreases.

Ceramic Coatings of Magnesium Alloy for Biomaterial Applications

2010 ◽  
Vol 434-435 ◽  
pp. 634-637 ◽  
Author(s):  
Pu Liang Zhang ◽  
Bin Liu ◽  
Dong Zhang ◽  
Yong Wei Tao ◽  
Sheng Rong Yang ◽  
...  
Keyword(s):  
Body Fluid ◽  
Ceramic Coatings ◽  
Alkaline Treatment ◽  
Mg Alloy ◽  
X Ray Diffraction ◽  
Electrodeposition Technique ◽  
Corrosion Properties ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Porous Oxide

Ceramic coatings were produced on magnesium (Mg) alloy of AZ91D for biomaterial applications by micro-arc oxidation (MAO) and electrodeposition methods. The morphology, microstructure, phase composition and corrosion properties of the prepared coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and potentiodynamic polarization tester, etc. The results indicated that a porous oxide layer was grown on the Mg alloy sheets after MAO process and the compositions of oxides were mainly Mg2SiO4 and MgO. After further electrodeposition and alkaline treatment, a flake-like structure diverging from centre to periphery was grown on the MAO coating and the coating was mainly made up of hydroxyapatite (HA). Moreover, the corrosion resistance of the Mg alloy after being treated with MAO and electrodeposition technique increases obviously, which was evaluated in stimulated body fluid (SBF).

Bioactive Porous Film Produced on Titanium Substrate by Micro-Arc Oxidation

2008 ◽  
Vol 368-372 ◽  
pp. 1201-1202
Author(s):  
Q. Ma ◽  
Y.J. Wang ◽  
Cheng Yun Ning ◽  
Hai Mei Cheng ◽  
Zhao Yi Yin
Keyword(s):  
Pure Titanium ◽  
Titanium Substrate ◽  
Disodium Salt ◽  
Commercially Pure Titanium ◽  
X Ray Diffraction ◽  
Electrolytic Solution ◽  
Glycerol Phosphate ◽  
X Ray ◽  
Commercially Pure ◽  
Micro Arc Oxidation

Porous bioactive thin film on commercially pure titanium substrate was prepared by micro-arc oxidation (MAO) in electrolytic solution, which contained calcium acetate, β-glycerol phosphate disodium salt pentahydrate (β-GP) and lanthanum nitrate. The phases and microstructure of the bioactive films were examined by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectrometer and electron probe microanalysis. The results showed that: (1) porous bioactive films with about 10μm were formed on titanium substrate by MAO; (2) phases of the thin films were hydroxyapatite, anatase and rutile; (3) elements of Ca, P, and Ti of films were identified by EDS.

Ribosome Structural Organization

1974 ◽  
Vol 32 ◽  
pp. 332-333
Author(s):  
James A. Lake
Keyword(s):  
Ribosomal Proteins ◽  
Structural Organization ◽  
Three Dimensional ◽  
Small Subunit ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
Specific Antibodies ◽  
X Ray ◽  
E Coli ◽  
Complete Sequences

The understanding of ribosome structure has advanced considerably in the last several years. Biochemists have characterized the constituent proteins and rRNA's of ribosomes. Complete sequences have been determined for some ribosomal proteins and specific antibodies have been prepared against all E. coli small subunit proteins. In addition, a number of naturally occuring systems of three dimensional ribosome crystals which are suitable for structural studies have been observed in eukaryotes. Although the crystals are, in general, too small for X-ray diffraction, their size is ideal for electron microscopy.

Structural Studies on the Effects of ZrO[sub 2] Coating on LiCoO[sub 2] during Cycling Using In Situ X-Ray Diffraction Technique

2006 ◽  
Vol 153 (11) ◽  
pp. A2152 ◽  
Author(s):  
Kyung Yoon Chung ◽  
Won-Sub Yoon ◽  
James McBreen ◽  
Xiao-Qing Yang ◽  
Si Hyoung Oh ◽  
...  
Keyword(s):  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray

Structural studies by x-ray diffraction of model phospholipid-insulin membranes

Biochemistry ◽  
1972 ◽  
Vol 11 (6) ◽  
pp. 945-949 ◽  
Author(s):  
R. P. Rand ◽  
S. SenGupta
Keyword(s):  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Crystallographic and optical study of LiNb1 − xTaxO3

2017 ◽  
Vol 73 (3) ◽  
pp. 498-506 ◽  
Author(s):  
S. Huband ◽  
D. S. Keeble ◽  
N. Zhang ◽  
A. M. Glazer ◽  
A. Bartasyte ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lithium Niobate ◽  
Lithium Tantalate ◽  
Flux Growth ◽  
Structural Studies ◽  
Optical Study ◽  
X Ray Diffraction ◽  
Growth Technique ◽  
X Ray ◽  
Li Content

Powders of lithium niobate-tantalate across the full compositional range have been made and crystals grown using a lithium vanadate flux growth technique. The Li-content of a lithium tantalate crystal has been determined using the zero-birefringence temperature and Curie measurements, confirming the Li content is between that of congruent and stoichiometric crystals. X-ray diffraction measurements show the Nb/Ta displacement and octahedral tilt both decrease as the Ta content is increased. This also results in a decrease in the lattice parameters from lithium niobate to lithium tantalate. Birefringence measurements on the crystals as a function of temperature have been used to determine the point that the crystals become zero-birefringent, and by comparison with the structural studies have confirmed that it is not related to a phase transition and the structures remain polar through the zero-birefringence points.

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