Investigation of γ-Alon Structural Evolution during Sintering and Hot-Pressing

Abstract:

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Dense polycrystalline aluminium oxynitride with spinel structure, -alon, is noted for its excellent thermal properties, high-temperature mechanical properties, low dielectric constant, thermal expansion coefficients and intrinsic transparency extending from ultraviolet to mid-infrared wavelengths. The dense materials were made by reactive pressureless sintering or hot-pressing of the SHS derived powders. Powders were synthesized from mixtures of aluminium and corundum powders of different proportions. The products of the SHS synthesis were composed mostly of -alon and in lesser extend of aluminium nitride. Ground powders were pressureless sintered at temperatures of 1800-2100°C for 2-6hs as well as hot-pressed at 1750-1950°C for 1 h under 25 MPa in nitrogen flow. The present work is focused on phase evolution of -alon materials during pressureless sintering and hot-pressing. The structural changes of -alon, a Al2O3 and AlN were also examined.

Info:

Periodical:

Edited by:

J. Dusza, R. Danzer, R. Morrell and G.D. Quinn

Pages:

313-316

DOI:

10.4028/www.scientific.net/KEM.409.313

Citation:

D. Zientara et al., "Investigation of γ-Alon Structural Evolution during Sintering and Hot-Pressing", Key Engineering Materials, Vol. 409, pp. 313-316, 2009

Online since:

March 2009

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Price:

$35.00

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