Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 87, Issue 5, Pages 779-783Publisher
AMER CERAMIC SOC
DOI: 10.1111/j.1551-2916.2004.00779.x
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Dense fine-grained B4C was synthesized by the spark plasma sintering (SPS) method using mechanically activated elemental powders. Relative densities of up to 95% were achieved. When characterized by X-ray line broadening methods, the grains of the resulting product were determined to be nanometric in scale. However, transmission electron microscopy (TEM) observations showed the product to be composed of a mixture of fine (nanometric) crystallites and grains in the micrometer range. The TEM images showed a highly defective structure containing a high density of twins. Their presence is the reason for the discrepancy between the X-ray and TEM results.
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