Fabrication of Textured β-Si3N4 and β-Sialon by Slip Casting in a Strong Magnetic Field and Reaction-Sintering

2010 ◽  
Vol 434-435 ◽  
pp. 5-8
Author(s):  
Yoshio Sakka ◽  
Xin Wen Zhu
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Strong Magnetic Field ◽  
Static Magnetic Field ◽  
Slip Casting ◽  
Rotating Magnetic Field ◽  
Texture Development ◽  
Reaction Sintering ◽  
Magnetic Filed ◽  
Orientation Ability

This paper reviews the most important results by the authors on the processing of textured -Si3N4 and -sialon by slip casting in a strong magnetic filed of 12 T and reaction-sintering. The a, b-axis textured -Si3N4 and -sialon have been obtained using the static magnetic field because of the magnetic susceptibility of ca, b > c c for -Si3N4. However, the c-axis textured -Si3N4 has also been successfully obtained using a rotating magnetic field. The -Si3N4 crystal was found to exhibit substantially stronger orientation ability than the a-Si3N4 crystal regardless of the Si3N4 raw powders. It reveals that the -Si3N4 nuclei play a key role in the texture development in -Si3N4/-sialon.

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.

scholarly journals Fabrication of textured Ti3SiC2 ceramic by slip casting in a strong magnetic field and pressureless sintering

2014 ◽  
Vol 122 (1429) ◽  
pp. 817-821 ◽  
Author(s):  
Kimitoshi SATO ◽  
Mrinalini MISHRA ◽  
Hiroto HIRANO ◽  
Tohru S. SUZUKI ◽  
Yoshio SAKKA
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Slip Casting ◽  
Pressureless Sintering

Textured Beta-Sialon:Eu2+ Phosphor Deposits Fabricated by Electrophoretic Deposition (EPD) Process within a Strong Magnetic Field: Preparation Process and Photoluminescence (PL) Properties Depending on Orientation

2015 ◽  
Vol 654 ◽  
pp. 268-273
Author(s):  
Chen Ning Zhang ◽  
Tetsuo Uchikoshi ◽  
Li Hong Liu ◽  
Benjamin Dierre ◽  
Yu Jin Cho ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Electric Field ◽  
Strong Magnetic Field ◽  
Electrophoretic Deposition ◽  
Intensity Ratio ◽  
Preparation Process ◽  
Crystal Axis ◽  
Chromaticity Coordinates ◽  
The Magnetic Field

Beta-sialon:Eu2+ phosphor deposits were fabricated by electrophoretic deposition (EPD) process within a strong magnetic field (12 T). The direction of the magnetic field was adjusted to be parallel or perpendicular to that of the electric field, that is, vertical-or horizontal setup. The oriented deposits were fabricated by aligning the β-sialon:Eu2+ particles along the higher magnetic-susceptibility c-crystal axis (a, b-crystal plane). For the case of vertically-setup magnetic field, the oriented deposit aligned along the c-axis possessed higher relative deposit density than the randomly fabricated deposit, as a result, varying the intensity ratio of emission and transmitted excitation, and therefore, presenting different chromaticity coordinates; for the case of horizontally-setup magnetic field, photoluminescence (PL) intensities of the deposits oriented along c-axis were significantly improved by comparing with those of the randomly-oriented ones.

Slip Casting of Alumina Suspensions in a Strong Magnetic Field

2010 ◽  
Vol 93 (10) ◽  
pp. 3148-3152 ◽  
Author(s):  
Li Zhang ◽  
Jef Vleugels ◽  
Omer Van der Biest
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Slip Casting ◽  
Alumina Suspensions

scholarly journals The Effect of Roasting Temperature on Ilmenite Particle Rotation Characteristics in a Rotating Magnetic Field

2003 ◽  
Vol 12 (3) ◽  
pp. 133-143
Author(s):  
N. R. Allen
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Rotating Magnetic Field ◽  
Magnetic Rotation ◽  
Particle Rotation ◽  
Particle Measurements ◽  
The Earth ◽  
Magnetic Elements ◽  
Force Increase ◽  
Roasting Temperature

Individual ilmenite particle measurements of magnetic susceptibility and magnetic rotation index show that, as ilmenite roast temperatures increase, both the magnetic anisotropy and the coercive force increase. By around 650°C the particles are behaving magnetically, in magnetic fields up to 0.3 T as though they contain magnetic elements with a single unidirectional magnetic axis.The presence of some magnetic field, even that of the earth, during the cooling of ilmenite samples roasted above 500°C may be essential to the magnetising roast process.

Formation of c-Axis Aligned Hydroxyapatite Sheet by Simultaneous Imposition of High Magnetic Field and Mold Rotation During Slip Casting Process

2006 ◽  
Vol 309-311 ◽  
pp. 53-56 ◽  
Author(s):  
Jun Akiyama ◽  
Masami Hashimoto ◽  
Hiroaki Takadama ◽  
Fukue Nagata ◽  
Yoshiyuki Yokogawa ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Materials ◽  
High Magnetic Field ◽  
Static Magnetic Field ◽  
Slip Casting ◽  
Casting Process ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Hydroxyapatite Crystal ◽  
Crystal Alignment

A high magnetic field is a useful tool to control the crystal alignment of non-magnetic materials such as ceramics and polymers. In the case of Hydroxyapatite crystal, the a,b-axis is aligned parallel to the direction of an imposed magnetic field. This fact implies that the alignment of the c-axis is not controllable only using a high static magnetic field due to the freedom of the c-axis in a plane perpendicular to a magnetic field direction. In this study, a high static magnetic field and mold rotation was simultaneously so applied during a slip casting process as to align the c-axis of HAp poly crystals.

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