Carbonization of various precursors. Effect of heating rate: Part I: Optical microscopy studies

摘要: During carbonization anisotropic domains, i.e. local molecular orientation (LMO), occurs. Their final size coincides with resolidification, fixing up the further properties of carbons. Five samples [pitch (Ashland 240), heavy petroleum products and kerogen increasingly cross-linked by oxygen] were studied optical microscopy after heat treatment at increasing heating rates (0.5°C min−1 4°C min−1). Anisotropy suddenly occurs softening before solidification an HTT as rate increases. also decreasing from pitch (A240) to products. Anisotropic domain sizes increase (local orientation) pitch.