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>Determination of Thermal Diffusivity and Its Temperature Dependence of Fe1?xO Scale at High Temperature by Electrical-Optical Hybrid Pulse-Heating Method
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Determination of Thermal Diffusivity and Its Temperature Dependence of Fe1?xO Scale at High Temperature by Electrical-Optical Hybrid Pulse-Heating Method
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机译：电光杂交脉冲加热法测定高温Fe 1？ X / Sub> X / Sub> o刻度的热扩散性及其温度依赖性
Thermal diffusivity of Fe_(1?x )O scale formed on iron sheets have been measured using an electrical-optical hybrid pulse-heating method, which can avoid decomposition of Fe_(1?x )O scale even at elevated temperatures by executing the experiment rapidly. The samples were 50 μ m-thick Fe_(1?x )O scale, which had been obtained by oxidation of a 0.5 mm-thick iron coupon at 1123 K in the air followed by sandblasting to remove the outer oxide layers of Fe_(3)O_(4) and Fe_(2)O_(3). In the experiment, the sample was heated by a large current pulse supplied to the iron layer of the coupon, and the Fe_(1?x )O scale was indirectly heated up to experimental temperature from room temperature within 0.2 s. The temperature was maintained at the experimental temperature, and the laser flash method was conducted to measure the effective thermal diffusivity of the coupon. The laser irradiation position was adjusted by two ceramics blocks to make the temperature profile better. The effective thermal diffusivity produced the value for Fe_(1?x )O scale based on a three-layered analysis for the Fe_(1?x ) O/iron/Fe_(1?x )O structure. Thermal diffusivities of Fe_(1?x )O scale were around 4.8 × 10~(?7) m~(2)s~(?1), and there can be seen no obvious temperature dependence from 600 K to 900 K. X-ray diffraction analysis confirmed that phase transformation did not occur in the Fe_(1?x )O scales during the experiment and x value was calculalted to be 0.09. Non-stoichiometry is supposed to have a significant effect on thermal diffusivity of Fe_(1?x )O scale and its temperature dependence in this research.
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