Texturing Ca-.ALPHA.-Sialon Via Strong Magnetic Field Alignment

Zhu, Xiaofang; Suzuki, Tohru; Uchikoshi, Tetsuo; Sakka, Yoshio

doi:10.2109/jcersj2.115.701

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…Therefore, in addition to the HW method, the TGG method is undoubtedly applicable to the production of textured α-Sialon ceramics, although there have apparently been no reports on this method. Moreover, SMFA is a novel processing technique for producing textured α-Sialon using α-Si 3 N 4 as the starting powder, as has been recently demonstrated by Zhu et al [218]. They obtained a, b-axis aligned Ca-α-Sialon using slip casting of α-Si 3 N 4 , CaCO 3 , Al 2 O 3 and AlN powders in an SMF of 12 T, followed by reaction sintering.…”

Section: Textured α-Sialonmentioning

confidence: 96%

“…Because of its cubic structure, the magnetic field does not lead to the crystallographic orientation of Y 2 O 3 during slip casting. Thus, corrected values for I (210) and I (101) can be calculated by the following equations [100]:…”

Section: A Relative Peak Intensitymentioning

confidence: 99%

“…In contrast, the α-raw powder led to a faster transformation rate of α/β-Si 3 N 4 to β-Sialon but a substantially lower texture in β-Sialon. Using the slip casting of Si powder containing β-Si 3 N 4 particles in an SMF, the authors also obtained a, b-axis aligned sintered reaction-bonded silicon nitride (SRBSN) [100]. Because of the cheap Si raw powder, the 60% weight gains by silicon nitridation, the machinability of RBSN body and the smaller sintering shrinkage, SRBSN is a well-known cost-effective Si 3 N 4 ceramic material, thus, this work suggested that the combination of SMFA and SRBSN is a promising method for fabricating cost-effective textured Si 3 N 4 as well as Sialon.…”

Section: (Iii) Rotating Magnetic Field Alignment Modelmentioning

confidence: 99%

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Textured silicon nitride: processing and anisotropic properties

Zhu

Sakka

2008

Science and Technology of Advanced Materials

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158

104

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Textured silicon nitride (Si 3 N 4 ) has been intensively studied over the past 15 years because of its use for achieving its superthermal and mechanical properties. In this review we present the fundamental aspects of the processing and anisotropic properties of textured Si 3 N 4 , with emphasis on the anisotropic and abnormal grain growth of β-Si 3 N 4 , texture structure and texture analysis, processing methods and anisotropic properties. On the basis of the texturing mechanisms, the processing methods described in this article have been classified into two types: hot-working (HW) and templated grain growth (TGG). The HW method includes the hot-pressing, hot-forging and sinter-forging techniques, and the TGG method includes the cold-pressing, extrusion, tape-casting and strong magnetic field alignment techniques for β-Si 3 N 4 seed crystals. Each processing technique is thoroughly discussed in terms of theoretical models and experimental data, including the texturing mechanisms and the factors affecting texture development. Also, methods of synthesizing the rodlike β-Si 3 N 4 single crystals are presented. Various anisotropic properties of textured Si 3 N 4 and their origins are thoroughly described and discussed, such as hardness, elastic modulus, bending strength, fracture toughness, fracture energy, creep behavior, tribological and wear behavior, erosion behavior, contact damage behavior and thermal conductivity. Models are analyzed to determine the thermal anisotropy by considering the intrinsic thermal anisotropy, degree of orientation and various microstructure factors. Textured porous Si 3 N 4 with a unique microstructure composed of oriented elongated β-Si 3 N 4 and anisotropic pores is also described for the first time, with emphasis on its unique mechanical and thermal-mechanical properties. Moreover, as an important related material, textured α-Sialon is also reviewed, because the presence of elongated α-Sialon grains allows the production of textured α-Sialon using the same methods as those used for textured β-Si 3 N 4 and β-Sialon.

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Section: Textured α-Sialonmentioning

confidence: 96%

Section: A Relative Peak Intensitymentioning

confidence: 99%

Section: (Iii) Rotating Magnetic Field Alignment Modelmentioning

confidence: 99%

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Textured silicon nitride: processing and anisotropic properties

Zhu

Sakka

2008

Science and Technology of Advanced Materials

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158

104

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“…The c-axis of Si 3 N 4 can also be aligned by a rotating magnetic field, and the thermal conductivity could be improved along the aligned c-axis in Si 3 N 4 . 46) The rotating magnetic field can be applied to various ceramics, such as ZnO, hydroxyapatite, and strontium barium niobite. 47)50) Furthermore, the modulated-rotation magnetic field (time-dependent elliptic magnetic field) enables the tri-axis orientation of materials with three different magnetic susceptibilities depending on each axis.…”

Section: Hard Magnetization Axis Orientation By Rotating the Magneticmentioning

confidence: 99%

Advanced control of crystallographic orientation in ceramics by strong magnetic field

Suzuki

2020

J. Ceram. Soc. Japan

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Tailoring the microstructure in ceramics is important for improving ceramic properties. There are many parameters for controlling the microstructure, such as grain size, grain shape, grain boundary, and second phase. Crystallographic orientation is a particularly important parameter because its properties depend on the axis of the crystal structure. Various techniques can be used to control crystallographic orientation. A strong magnetic field can be applied to control the orientation even in diamagnetic ceramics and can be combined with other processes for fabricating the controlled microstructure. Therefore, magnetic alignment was the technique focused on in this review.

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“…However, because the Ti 3 SiC 2 grains could not be aligned to one direction, the ceramic texture was not homogeneous and the texture degree was low. Recently, tailored Al 2 O 3 , Si 3 N 4 , ZrO 2 and AlN ceramics have been successfully prepared using the strong magnetic field alignment (SMFA) method [13][14][15][16][17][18][19]. In this process, the ceramic crystals with asymmetric unit cell rotate to minimize the total energy in the magnetic field [20].…”

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties of highly textured polycrystalline Nb₄AlC₃ceramic

Sakka

Nishimura

et al. 2011

Science and Technology of Advanced Materials

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Highly textured polycrystalline Nb 4 AlC 3 ceramic was fabricated by slip casting in a strong magnetic field followed by spark plasma sintering. Its Lotgering orientation factor was determined on the textured top and side surfaces as f (00l) ∼ 1.0 and f (hk0) = 0.36, respectively. This ceramic showed layered microstructure at the scales ranging from nanometers to millimeters. The as-prepared ceramic had excellent anisotropic physical properties. Along the c-axis direction, it showed higher hardness, bending strength, and fracture toughness of 7.0 GPa, 881 MPa and 14.1 MPa m 1/2 , respectively, whereas higher values of electrical conductivity (0.81 × 10 6 −1 m −1 ), thermal conductivity (21.20 W m −1 K −1 ) and Young's modulus (365 GPa) were obtained along the a-or b-axis direction.

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Texturing Ca-.ALPHA.-Sialon Via Strong Magnetic Field Alignment

Cited by 10 publications

References 24 publications

Textured silicon nitride: processing and anisotropic properties

Textured silicon nitride: processing and anisotropic properties

Advanced control of crystallographic orientation in ceramics by strong magnetic field

Physical and mechanical properties of highly textured polycrystalline Nb₄AlC₃ceramic

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Texturing Ca-.ALPHA.-Sialon Via Strong Magnetic Field Alignment

Cited by 10 publications

References 24 publications

Textured silicon nitride: processing and anisotropic properties

Textured silicon nitride: processing and anisotropic properties

Advanced control of crystallographic orientation in ceramics by strong magnetic field

Physical and mechanical properties of highly textured polycrystalline Nb4AlC3ceramic

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Product

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Physical and mechanical properties of highly textured polycrystalline Nb₄AlC₃ceramic