Fabrication of α-Sialon Nano-Ceramics

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Y- α-sialon (m=1.35, n=0.675) ceramics were prepared by high-energy mechanical milling followed by spark plasma sintering. The milling promoted not only liquid-phase sintering, but also phase transformation from β-Si3N4 to α-sialon. Under the same holding time of 5 min, milled powder could be completely densified at 1500oC, which is about 250oC lower than that required for as-received powder. The temperature where the phase transformation finished was 1600oC and 1750oC for milled and as-received powder, respectively. The grain size of obtained dense ceramics from milled powder was significantly decreased. Nano-sized dense ceramics have been obtained by sintering the milled powder at 1500oC for 5 min. Although 100 % α-sialon has not been achieved, the nano-sized ceramics can be used for superplastic deformation, taking advantage of small grain size and large amount of transient liquid phase.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

629-632

DOI:

10.4028/www.scientific.net/KEM.317-318.629

Citation:

X. Xu, T. Nishimura, N. Hirosaki, R. J. Xie, Y. Yamamoto, H. Tanaka, "Fabrication of α-Sialon Nano-Ceramics ", Key Engineering Materials, Vols. 317-318, pp. 629-632, 2006

Online since:

August 2006

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$35.00

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