Influence of Planetary High‐Energy Ball Milling on Microstructure and Mechanical Properties of Silicon Nitride Ceramics
Authors:
- 29 April 2005
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 88 (5) , 1323-1326
Abstract
The influence of ball‐milling methods on microstructure and mechanical properties of silicon nitride (Si 3 N 4 ) ceramics produced by pressureless sintering for a sintering additive from MgO–Al 2 O 3 –SiO 2 system was investigated. For planetary high‐energy ball milling, the mechanical properties of Si 3 N 4 ceramics were evidently improved and a homogeneous microstructure developed. In contrast, some exaggerated elongated grains were developed due to the local enrichment of sintering additives in the specimen prepared by general ball milling. For Si 3 N 4 ceramics produced by planetary ball milling, flexure strength of 1.06 GPa, Vickers hardness of 14.2 GPa, and fracture toughness of 6.6 MPa·m 0.5 were achieved. The differences in the mechanical properties of Si 3 N 4 ceramics produced by different processing seem to arise mainly from the changes in microstructural homogenization and sinterability. The planetary high‐energy ball‐milling process provides a good route to mix starting powders for developing ceramics with uniform microstructure and promising mechanical properties.Keywords
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