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.

Grain-Orientation Control of Bi5FeTi3O15 Ceramics Prepared by Magnetic-Field-Assisted Electrophoretic Deposition Method

2008 ◽  
Vol 388 ◽  
pp. 205-208
Author(s):  
Muneyasu Suzuki ◽  
Tetsuo Uchikoshi ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Magnetic Field ◽  
Diffraction Analysis ◽  
Electrophoretic Deposition ◽  
Grain Orientation ◽  
Sintered Density ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Axis Orientation ◽  
Orientation Degree ◽  
X Ray

Magnetic-field-assisted electrophoretic deposition (B-assisted EPD) method has been applied for synthesizing a(b)-axis-oriented Bi5FeTi3O15 ceramics, and the effects of the B-assisted EPD on grain orientation and microstructures have been investigated. The sintering at 1100oC of the green compact obtained by the B-assisted EPD led to dense ceramics with a high relative sintered density of 98%. X-ray diffraction analysis shows that the a(b)-axis-orientation degree of the grain oriented ceramics evaluated by the Lotgering method was 45 %.

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.

Textured Ti3SiC2 by EPD in a Strong Magnetic Field

2012 ◽  
Vol 507 ◽  
pp. 15-19 ◽  
Author(s):  
Mrinalini Mishra ◽  
Yoshio Sakka ◽  
Chun Feng Hu ◽  
Tohru Suzuki ◽  
Tetsuo Uchikoshi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Zeta Potential ◽  
Diffraction Analysis ◽  
Strong Magnetic Field ◽  
Side Surface ◽  
Cationic Polyelectrolyte ◽  
Max Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Suspension Parameters

We present a method for fabrication of textured MAX phase ceramics, particularly, Ti3SiC2; by EPD in a strong magnetic field (12T). Ti3SiC2 was dispersed in cationic polyelectrolyte-Polyethylenimine (PEI). Addition of 0.3-1dwb PEI resulted in high zeta potential values and suspension was found to be stable and of good fluidity. The optimized suspension parameters for EPD were determined as 10vol% Ti3SiC2 and 1dwb PEI in 50 % ethanolic water at pH ~ 7. X-ray diffraction analysis of the textured samples revealed that the preferred orientation of Ti3SiC2 grains parallel to the magnetic eld direction was along the a,b-axis. The Lotgering orientation factors on the textured top surface and textured side surface were determined as f (hk0) = 0.35 and f (00l) = 0.75, respectively.

Texturation of YBa2Cu3O7-δ Thick Films by Electrophoretic Deposition under Magnetic Field

2006 ◽  
Vol 314 ◽  
pp. 153-158 ◽  
Author(s):  
L. Dusoulier ◽  
S. Denis ◽  
N. Nutal ◽  
Catherine Henrist ◽  
B. Vanderheyden ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrophoretic Deposition ◽  
Substrate Surface ◽  
Thick Films ◽  
X Ray Diffraction ◽  
Surface Scanning ◽  
X Ray ◽  
Axis Alignment ◽  
Polarised Light ◽  
Scanning Electron

YBa2Cu3O7-δ coatings were deposited by electrophoretic deposition (EPD) onto Ni substrates. Particles of different sizes and shapes were used in order to study the influence of the powder microstructure on the film density. Texturation of the thick films was induced by application of a magnetic field during the electrophoretic deposition. X-ray diffraction analysis has clearly shown preferred c-axis alignment of the YBa2Cu3O7-δ films along the direction normal to the substrate surface. Scanning electron microscopy and optical polarised light microscopy were used to characterise the microstructure of the coatings, revealing a nonrandom platelets organisation.

Texturing of Si3N4 Ceramics via Strong Magnetic Field Alignment

2008 ◽  
Vol 368-372 ◽  
pp. 871-874 ◽  
Author(s):  
Xin Wen Zhu ◽  
Tohru Suzuki ◽  
Tetsuo Uchikoshi ◽  
Yoshio Sakka
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Strong Magnetic Field ◽  
Slip Casting ◽  
Rotating Magnetic Field ◽  
Pressureless Sintering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Scanning Electron

This paper reports the texture development in Si3N4 by strong magnetic field alignment (SMFA), using slip casting of α-Si3N4 raw powder (SN-E10) and pressureless sintering. The texture of β-Si3N4 in the green and sintered bodies was characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The a, b-axis and c-axis aligned β-Si3N4 has been obtained by the static and rotating magnetic field of 12 T, respectively. The β-seed addition and prolonged sintering both enhance the texture, but the former is more efficient. This work suggests an efficient SMFA strategy of producing highly textured β-Si3N4, particularly the unidirectionally c-axis aligned β-Si3N4 by seeding the α-raw powder using the less-agglomerated β-phase particles.

Control of crystalline texture in polycrystalline alumina ceramics by electrophoretic deposition in a strong magnetic field

2004 ◽  
Vol 19 (5) ◽  
pp. 1487-1491 ◽  
Author(s):  
T. Uchikoshi ◽  
T.S. Suzuki ◽  
H. Okuyama ◽  
Y. Sakka
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Electric Fields ◽  
Electrophoretic Deposition ◽  
Alumina Powder ◽  
Layer By Layer ◽  
Alumina Ceramics ◽  
X Ray Diffraction ◽  
Polycrystalline Alumina ◽  
Seed Particles

Highly crystalline-textured pure dense alumina ceramics were fabricated from spherical alumina powder without any seed particles and sintering additives by electrophoretic deposition (EPD) in a strong magnetic field of 10 T. The crystalline texture was confirmed by x-ray diffraction (XRD) for alumina ceramics deposited at 10 T followed by sintering at 1873 K. The angle between the directions of the magnetic and electric fields (φB-E) was altered to control the dominant crystal faces of the α-alumina monoliths. The average orientation angles estimated from the XRD diagram of the samples prepared at φB-E = 0°, 45°, and 90° were 16.52°, 45.15°, and 84.90°, respectively. Alumina/alumina laminar composites with different crystalline-oriented layers were also fabricated by alternately changing the φB-E layer by layer during EPD in a 10 T magnetic field. It was demonstrated that by using this technique, it is possible to control the crystalline orientation by changing the angle of E versus B during the EPD.

Self-Recognizing π-π Stacking Interactions Designed for the Generation of Ultrastable Mesoporous Hydrogen-Bonded Organic Frameworks

2019 ◽  
Author(s):  
KAIKAI MA ◽  
Peng Li ◽  
John Xin ◽  
Yongwei Chen ◽  
Zhijie Chen ◽  
...  
Keyword(s):  
Pore Size ◽  
Fiber Composite ◽  
Aqueous Media ◽  
Stacking Interactions ◽  
Mustard Gas ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Strategy ◽  
Π Stacking ◽  
Hydrogen Bonded

Creating crystalline porous materials with large pores is typically challenging due to undesired interpen-etration, staggered stacking, or weakened framework stability. Here, we report a pore size expansion strategy by self-recognizing π-π stacking interactions in a series of two-dimensional (2D) hydrogen–bonded organic frameworks (HOFs), HOF-10x (x=0,1,2), self-assembled from pyrene-based tectons with systematic elongation of π-conjugated molecular arms. This strategy successfully avoids interpene-tration or staggered stacking and expands the pore size of HOF materials to access mesoporous HOF-102, which features a surface area of ~ 2,500 m2/g and the largest pore volume (1.3 cm3/g) to date among all reported HOFs. More importantly, HOF-102 shows significantly enhanced thermal and chemical stability as evidenced by powder x-ray diffraction and N2 isotherms after treatments in chal-lenging conditions. Such stability enables the adsorption of dyes and cytochrome c from aqueous media by HOF-102 and affords a processible HOF-102/fiber composite for the efficient photochemical detox-ification of a mustard gas simulant.

scholarly journals Modeling of magneto-conductivity of bismuth selenide: a topological insulator

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Yogesh Kumar ◽  
Rabia Sultana ◽  
Prince Sharma ◽  
V. P. S. Awana
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Single Crystal ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Field Range ◽  
X Ray ◽  
Bulk Carriers ◽  
Different Temperatures

AbstractWe report the magneto-conductivity analysis of Bi2Se3 single crystal at different temperatures in a magnetic field range of ± 14 T. The single crystals are grown by the self-flux method and characterized through X-ray diffraction, Scanning Electron Microscopy, and Raman Spectroscopy. The single crystals show magnetoresistance (MR%) of around 380% at a magnetic field of 14 T and a temperature of 5 K. The Hikami–Larkin–Nagaoka (HLN) equation has been used to fit the magneto-conductivity (MC) data. However, the HLN fitted curve deviates at higher magnetic fields above 1 T, suggesting that the role of surface-driven conductivity suppresses with an increasing magnetic field. This article proposes a speculative model comprising of surface-driven HLN and added quantum diffusive and bulk carriers-driven classical terms. The model successfully explains the MC of the Bi2Se3 single crystal at various temperatures (5–200 K) and applied magnetic fields (up to 14 T).

Mechanically Driven Dissolution of Sn in Near-Equiatomic Bcc FeCo

2012 ◽  
Vol 194 ◽  
pp. 187-193 ◽  
Author(s):  
J.M. Loureiro ◽  
Benilde F.O. Costa ◽  
Gerard Le Caër ◽  
Bernard Malaman
Keyword(s):  
Magnetic Field ◽  
Solid Solutions ◽  
Room Temperature ◽  
Hyperfine Magnetic Field ◽  
Ternary Alloys ◽  
119Sn Mössbauer Spectroscopy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Powder Mixtures ◽  
X Ray

Ternary alloys, (Fe50−x/2Co50−x/2)Snx(x ≤ 33 at.%), are prepared by mechanical alloying from powder mixtures of the three elements. As-milled alloys are studied by X-ray diffraction and 57Fe and 119Sn Mössbauer spectroscopy. The solubility of Sn in near-equiatomic bcc FeCo is increased from ~0.5 at. % at equilibrium to ~20 at.% in the used milling conditions. The average 119Sn hyperfine magnetic field at room temperature is larger, for any x, than the corresponding fields in mechanically alloyed Fe-Sn solid solutions.

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