Structure and Formation of Vermicular Graphite

  • Deng X
  • Zhu P
  • Liu Q
  • 6

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Abstract

Using both liquid quenching and SEM techniques, it was found that the vermicular graphite (eVG) was formed mainly in two ways. In the first, it grows out from flake graphite; in the second, it degenerates from spheroidal graphite (SG). According to this, two models of morphology and formation process of eVG are suggested. It was discovered that the growth direction of eVG often changes from a- to c-direction, or vice versa. Because of the influence of modifying elements, the eVG is twisted severely, changing its growth direction continually and branching fre­ quently. The growth of the branches may be in a- and/or c-direc­ tion, and their tips may be round and/or sharp. In all cases, there exists a large fraction of thick flake graphite in the vermicular graphite. It is suggested that the redistribution of modifying ele­ ments plays an important role in the formation of eVG

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Authors

  • X.J. Deng

  • P.Y. Zhu

  • Q.F. Liu

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