Journal of Materials Science

, Volume 4, Issue 8, pp 685–691 | Cite as

Siliconated pyrolytic graphite

Part 3 Structural features
  • Seishi Yajima
  • Toshio Hirai


The structural features of several samples of siliconated pyrolytic graphite (0.02 to 4 wt % silicon) prepared at various deposition temperatures, total gas pressures and partial pressures of silicon tetrachloride vapour have been examined by X-ray diffraction. The structural features investigated include interlayer spacing, ordering, intercrystallite porosity, preferred orientation and crystallite size. These features are affected by the preparation conditions. By the addition of silicon tetrachloride vapour, the ordering and the crystallite size of the graphite matrix are developed, the preferred orientation improved and the porosity diminished. The effects of the addition of silicon tetrachloride on the structural features are marked at high total gas pressures, at high partial pressures of silicon tetrachloride vapour and in the medium temperature range of 1600 to 1700° C.


Porosity Graphite Structural Feature Partial Pressure Crystallite Size 
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Copyright information

© Chapman and Hall 1969

Authors and Affiliations

  • Seishi Yajima
    • 1
  • Toshio Hirai
    • 1
  1. 1.Research Institute for Iron, Steel and Other MetalsTohoku UniversitySendaiJapan

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