Influence of additive content on the anisotropy in hot-pressed Si3N4 ceramics using grain orientation measurements
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Abstract
Abstract The influence of additive content on the microstructure and its mechanical properties in planes parallel and normal to the hot-pressing axis of Si 3 N 4 ceramics has been investigated by direct measurement of the grain orientation from SEM micrographs and orientated Vicker’s indentations. It is shown that an increasing additive content leads to a microstructure with grains of higher aspect ratios, resulting in an increase of the fracture toughness. Furthermore, the difference in mechanical anisotropy between the planes parallel and normal to the hot-pressing directions is gradually reduced with increasing additive content, due to the smaller degree of orientation of the elongated β-Si 3 N 4 grains in the plane parallel to the hot-pressing direction.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties · Advanced materials and composites
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References (26)
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