Quantitative thermal investigation of a fayalite particle and a Si-rich layer in oxide scale formed on steel

Fayalite (Fe2SiO4) is a major component of olivine and often formed in the surface oxide layer (oxide scale) on steel plates owing to its high-temperature oxidation. The thermal conductivity scale constituents, including fayalite, essential for controlling cooling rate hot plates. Therefore, this study uses modulated thermoreflectance microscopy determine effusivity/conductivity fayalite particles with diameters smaller than 180 μm because sample commercially available such small size. This optical enables measurement effusivity areas, as 10 μm. were found be 4.1 ± 0.2 kJs-0.5K-1m-2 6.0 0.5 Wm-1K-1, respectively. These values are representative bulk value. Additionally, shown higher that wüstite (Fe1-xO), which main scale. thick plate comprises Si-rich layer, magnetite layer. Furthermore, wüstite, pores. effective was calculated by observing plate. low indicates strongly affected porosity although thin, it significantly contributes heat resistance