Abstract
The borosilicate scales with different B2O3 contents were prepared on MoSi2 ceramics by cold pressing, pressureless sintering and pre-oxidation. Hot corrosion with Na2SO4 was carried out at 1000 °C for 8 h. The pre-oxidized borosilicate scale on ceramics with 10 wt% B2O3 has an excellent hot corrosion resistance. B2O3–SiO2 barrier scales mainly contained amorphous borosilicate glass which can reacted with Na2SO4 producing sodium borosilicate glass to cover and heal the corroded surface. The Mo-based particles under the barrier scale were isolated to avoid severe reactions producing Na2MoO4, so the borosilicate barrier scale had an excellent corrosion resistance to Na2SO4 molten salt.
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