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过程工程学报 2010
Preparation and Characterization of High Temperature Protective Ceramic Coating for Plain Carbon Steel
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Abstract:
A new high temperature protective ceramic coating used on the surface of plain steel was prepared by mechanical mixing method. The coating was consisted of magnesia, titania, alumina and calcium oxide mixture. Such a coating, when it was applied superficially on Q235B plain steel surface, could form a compact scale and enhance oxidation resistance at 1300℃. The experimental result showed that the granularity between 48～75 μm and coating layer thickness of 0.5 mm were needed to observe the coating performance. The coating could work effectively in the temperature range of 900～1300℃. Metal loss was diminished by 59.36% compared with the uncoated sample at 1300℃. Duration of the coating could last over 8 h. The ceramic coating converted the scale structure from classic Fe_2O_3/Fe_3O_4/FeO three layers to one spinel layer, suppressed the growth of iron oxides and decreased Fe diffusion speed sharply at elevated temperature.
