RECENT DEVELOPMENTS IN PYROLYTIC GRAPHITE
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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A study of the fine microstructure of boronated pyrolytic graphite was made utilizing optical and electron microscopy and X-ray diffraction techniques. The influence of boron content on the laminar structure, the lattice parameter, the lattice strain, the particle size, and the flexural strength of pyrolytic graphite were studied. Significant changes in the behavior of all investigated parameters were observed in the 0.50 to 0.75 percent boron range. A mechanism relating these changes to the appearance of a B4C deposit is hypothesized. In addition, the effects of post-deposition thermal treatment on the mechanical properties of unboronated pyrolytic graphite are discussed. Some general remarks concerning similarities in structure of pyrolytic materials are presented.
- Ceramics, Refractories and Glass