Fabrication and Evaluation of Porous Ca‐α SiAION Ceramics

Tatami, Junichi; Ohta, Takayuki; Zhang, Cheng; Hotta, Mikinori; Komeya, Katsutoshi; Meguro, Takeshi; Omori, Mamoru; Hirai, Toshio

doi:10.1002/9781118405970.ch5

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Ca-¡ SiAlON powder 46) Porous Ca-¡ SiAlON ceramics were fabricated by using the hollow spherical Ca-¡ SiAlON powder and by maintaining their unique shape.…”

Section: Porous Sialon Ceramics From Hollow Sphericalmentioning

confidence: 99%

Microstructural control for ultrafine-grained non-oxide structural ceramics

Hotta

2012

J. Ceram. Soc. Japan

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Ultrafine-grained non-oxide ceramics were prepared by combining the synthesis technology for fine-grained starting powders and the rapid sintering technology for spark plasma sintering (SPS); the two technologies were combined for obtaining ceramics with improved heat and corrosion resistance and improved mechanical properties. Hollow spherical Ca-¡ SiAlON powders composed of nanosized particles were synthesized by carbothermal reductionnitridation of a SiO 2 Al 2 O 3 CaCO 3 powder mixture. Using the Ca-¡ SiAlON powder, dense Ca-¡ SiAlON nanoceramics and porous Ca-¡ SiAlON ceramics with excellent mechanical properties and high heat and corrosion resistance were fabricated by the SPS technique. Ultrafine-grained Si 3 N 4 and SiC ceramics were prepared from fine-grained Si 3 N 4 and SiC powders by SPS. The densification of cubic-BN-dispersed ceramics composites was achieved without the phase transformation of cubic BN to low-hardness hexagonal BN, at a moderate pressure by the SPS technique.

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“…Ca-¡ SiAlON powder 46) Porous Ca-¡ SiAlON ceramics were fabricated by using the hollow spherical Ca-¡ SiAlON powder and by maintaining their unique shape.…”

Section: Porous Sialon Ceramics From Hollow Sphericalmentioning

confidence: 99%

Microstructural control for ultrafine-grained non-oxide structural ceramics

Hotta

2012

J. Ceram. Soc. Japan

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Review and Overview of Silicon Nitride and SiAlON, Including their Applications

Kita

Hyuga

Hotta

et al. 2013

Handbook of Advanced Ceramics

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Formation Process of Calcium‐α SiAlON Hollow Balls Composed of Nanosized Particles by Carbothermal Reduction–Nitridation

Hotta

Tatami

Komeya

et al. 2008

Journal of the American Ceramic Society

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Carbothermal reduction–nitridation (CRN) of SiO2–Al2O3–CaO powders was performed under various firing conditions to investigate the formation process of Ca‐α sialon hollow balls composed of nanosized particles. Scanning electron microscopy and transmission electron microscopy observations of the samples obtained at different firing temperatures confirmed that solid spherical particles were formed at the early stage of the reaction, and nanosized particles were subsequently produced on the surface of these solid balls. From X‐ray diffraction and energy‐dispersive spectrometry analyses, it was found that the solid balls initially formed at 1450°C were mainly amorphous and contained Si, Al, Ca, O, and a small amount of N. Further nitridation at 1450°C gradually converted the solid balls into Ca‐α sialon hollow balls over time. The results revealed that the formation of Ca‐α sialon hollow balls depends on the formation of solid balls from the Si–Al–Ca–O liquid phase at the initial stage of the CRN process.

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Fabrication and Evaluation of Porous Ca‐α SiAION Ceramics

Cited by 3 publications

References 14 publications

Microstructural control for ultrafine-grained non-oxide structural ceramics

Microstructural control for ultrafine-grained non-oxide structural ceramics

Review and Overview of Silicon Nitride and SiAlON, Including their Applications

Formation Process of Calcium‐α SiAlON Hollow Balls Composed of Nanosized Particles by Carbothermal Reduction–Nitridation

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