Nano Ceramics Center, National Institute for Materials Science

Sakka, Yoshio; Tanaka, Hidehiko; Hirosaki, Naoto; Hiraga, Keijiro; Ishigaki, Takamasa; Inoue, Satoru

doi:10.1016/j.stam.2007.09.007

Cited by 2 publications

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“…Ceramic materials are used in a wide variety of applications, taking advantage of their electric, dielectric, thermal, optical, chemical and mechanical properties. Control of the fine structure in the ceramic materials can further improve these properties [1,2]. Alignment of the crystal orientation of the fine particles forming the ceramics is cited as one of the most efficient methods for the control of the fine structure.…”

Section: Introductionmentioning

confidence: 99%

Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Terada¹,

Suzuki²,

Suzuki³

et al. 2009

J. Phys. D: Appl. Phys.

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We have performed neutron diffraction experiments on highly oriented α-Al2O3, obtained by slip casting under a magnetic field and sintering. In order to investigate the magnetic field, B, and sintering temperature, Tsint, dependence of the degree of alignment of the orientation, we used samples treated with systematically varied B up to 12 T and Tsint up to 1600 °C. The degree of alignment of the magnetic easy axis (the hexagonal c-axis) is rapidly enhanced by sintering above 1200 °C, which is coincident with the temperature at which crystal grains start to grow. The angular distribution of the c-axis for the sample sintered at 1600 °C, obtained by ω-scan neutron diffraction profiles, is almost coincident with the probability distribution calculated for the particle size two times larger than that in the starting material. We discuss the orientation process mechanism with sintering in light of the results of this analysis.

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Section: Introductionmentioning

confidence: 99%

Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Terada¹,

Suzuki²,

Suzuki³

et al. 2009

J. Phys. D: Appl. Phys.

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“…However, many of their properties such as superplasticity [6,7], transparency [8] and ionic conductivity [9,10] are still subject to improvements. To achieve this, it is very important to have good control of the microstructure at the nanoscale level [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of starting powders on the sintering of nanostructured ZrO₂ceramics by colloidal processing

Suárez

Sakka

Suzuki

et al. 2009

Science and Technology of Advanced Materials

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The effect of starting powders on the sintering of nanostructured tetragonal zirconia was evaluated. Suspensions were prepared with a concentration of 10 vol.% by mixing a bicomponent mixture of commercial powders (97 mol.% monoclinic zirconia with 3 mol.% yttria) and by dispersing commercially available tetragonal zirconia (3YTZ, Tosoh). The preparation of the slurry by bead-milling was optimized. Colloidal processing using 50 µm zirconia beads at 4000 rpm generated a fully deagglomerated suspension leading to the formation of high-density consolidated compacts (62% of the theoretical density (TD) for the bicomponent suspension). Optimum colloidal processing of the bicomponent suspension followed by the sintering of yttria and zirconia allowed us to obtain nanostructured tetragonal zirconia. Three different sintering techniques were investigated: normal sintering, two-step sintering and spark plasma sintering. The inhibition of grain growth in the bicomponent mixed powders in comparison with 3YTZ was demonstrated. The inhibition of the grain growth may have been caused by inter-diffusion of cations during the sintering.

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Nano Ceramics Center, National Institute for Materials Science

Cited by 2 publications

References 10 publications

Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Effect of starting powders on the sintering of nanostructured ZrO₂ceramics by colloidal processing

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Nano Ceramics Center, National Institute for Materials Science

Cited by 2 publications

References 10 publications

Neutron diffraction texture analysis for α-Al2O3oriented by high magnetic field and sintering

Neutron diffraction texture analysis for α-Al2O3oriented by high magnetic field and sintering

Effect of starting powders on the sintering of nanostructured ZrO2ceramics by colloidal processing

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Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Neutron diffraction texture analysis for α-Al₂O₃oriented by high magnetic field and sintering

Effect of starting powders on the sintering of nanostructured ZrO₂ceramics by colloidal processing