Abstract
Three kinds of β-Si 3N 4 whisker-reinforced Si 3N 4 composites with different whisker alignment were designed and fabricated by using tape casting, extrusion and hot pressing processes. The grain alignment of the composites was characterized quantitatively by normalized pole density based on X-ray diffraction (XRD) measurement. The normalized pole density W hkl t near the normal of the surface perpendicular to the whisker alignment direction was used to characterize the degree of the grain alignment. The distribution of normalized pole density of the (002) lattice plane in different directions was also obtained. The grain alignment was further approved by scanning electron microscopy analysis.
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