Fine-Grained Si3N4-Containing Ceramics from Nanopowders

Ilmars Zalite; Natalja Zilinska; Janis Krastins; Ints Šteins

doi:10.4028/www.scientific.net/MSF.636-637.130

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HomeMaterials Science ForumMaterials Science Forum Vols. 636-637Fine-Grained Si3N4-Containing Ceramics from...

Fine-Grained Si₃N₄-Containing Ceramics from Nanopowders

Abstract:

Different compositions of SiAlON materials have been prepared from separate nanopowders and their composites: Si3N4 – AlN, Si3N4, Al2O3 and Y2O3, produced by the method of plasma-chemical synthesis. Compositions have been pressure-less sintered in nitrogen medium up to 1750°C with a heating rate of 10°C/min and holding time for 2 hours or by spark plasma sintering (SPS) in vacuum at 1700°C with a heating rate of 100°C/min and holding time of 5 min. The densification behaviour of the materials at these sintering conditions depends insignificantly on the powder composition. It is possible to obtain dense ceramic materials with relatively fine-grained structure (200-300 nm) from nanosized powders at relatively low temperatures (1400 - 1600°C) with good mechanical properties.

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Materials Science Forum (Volumes 636-637)

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130-135

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.636-637.130

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Online since:

January 2010

Authors:

Ilmars Zalite, Natalja Zilinska, Janis Krastins, Ints Šteins

Keywords:

Grain Size, Mechanical Property, Nanocomposite, Sintering, Spark Plasma Sintering (SPS), ß-SiAlON

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