Interaction Between ZrB2–MoSi2 Cermets and Oxide Melts
Contact interaction of ZrB2–MoSi2 materials with oxide melts is studied. The oxide melts are formed during combustion of low-reaction coals containing 30–49% oxides. It is established that ZrB2–MoSi2 composites are wetted by oxide melts (contact angles being 21–5° depending on material composition) at 1600–1700°C in wetting conditions as well as during interaction for 6 h. A thin layer (~5–15 μm) forms in the contact zone, SiO2 and ZrO2 being its main phases. There are a great number of MoO3, CaO, and Fe2O3 oxides at the boundary of these phases. The contact layer serves as a film protecting the composite against further corrosion in oxide melts. The optimum composition of ZrB2–MoSi2 ceramics, which is resistant to corrosion in oxide melts, is determined.