Abstract
By pyrolyzing a mixture of Si-containing pre-ceramic polymers and TiH 2 powders in a N 2 atmosphere, a TiN –Ti 5Si 3 composite was synthesized. The composite was then corroded between 700 °C and 1000 °C for 20 h in an Ar–0.2% SO 2 atmosphere. TiN was mainly oxidized to rutile TiO 2. Ti 5Si 3 was oxidized to TiO 2 supersaturated with Si ions, and sulfidized to Ti 2S supersaturated with Si ions. At initial stage of corrosion, oxidation dominated sulfidation. As corrosion proceeded, sulfidation progressively occurred underneath the oxide scale based on the decreased oxygen potential and increased sulfur potential near the scale/matrix interface.
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