Pressureless sintering and characterization of cordierite/ZrO2 composites |
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Authors: | En-Hai Sun Yong-Ho Choa Tohru Sekino Tomohiko Adachi Koichi Niihara |
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Affiliation: | (1) Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan,;(2) Faculty of New Material Engineering, Chonbuk National University, Chonbuk, 561-756, Korea, |
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Abstract: | Cordierite/ZrO2 composites with 5 to 25 wt% ZrO2 were fabricated by conventional powder mixing and pressureless sintering method. Their densification behavior, microstructure,
mechanical and thermal properties were studied. By dispersing 25 wt% (9.57 vol%) ZrO2, densified cordierite/ZrO2 composite with a relative density of 98.5% was obtained at an optimum sintering condition of 1440 °C and 2 h. ZrO2 particles were homogenously dispersed within matrix grains and at the grain boundaries. The intragranular particles were
finer than 100 nm and the intergranular particles were coarser. Both fracture strength and toughness could be enhanced more
than two times higher, compare to those of monolithic cordierite, by dispersing 25 wt% ZrO2 into the cordierite matrix. The toughening mechanism in the present composites was mainly attributed to martensitic transformation
due to ZrO2 dispersion.
Electronic Publication |
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Keywords: | Cordierite ZrO2 Composite Toughening Pressureless Sintering |
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