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Studies on the thermal stability of FeCr2O4 in air show that surface oxidation preceeds bulk oxidation. Electrical resistivity and thermoelectric power measurements show that above 47 K, …
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The thermal diffusivity and specific heat of Armco iron are reported in the temperature range of 25° to 1000°C. Electrical‐resistivity values are reported from. Skip to Main Content. ... Thermal diffusivity measurement of Armco iron by a novel method. Rev. Sci. Instrum. (May 1977)
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Request PDF | Thermal Diffusivity of Solid and Liquid 304 Stainless Steel, Iron, and Zirconium | Measurement of the thermophysical properties of liquid metals is a highly challenging task due to ...
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The average value, 1.62 mm 2 /s, is similar to the thermal diffusivity of En 89, 1.82 mm 2 /s, at the ambient condition in this study. The thermal diffusivity of En 89 in this study is a little higher than that of En 90 along c axis (Chai et al., 1996) under ambient conditions.
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Thermal diffusivity ... The temperature profile through the central axil of the packed bed was measured by six iron thermocouples placed as depicted in the figure. ... in Fig. 13, ball bearings, copper chromite and chromia alumina have similar diameters (between 3 and 4 mm), showing three lines which clearly differ from the two lines ...
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This paper reports the results of transient grating spectroscopy—a rapid, non-destructive, in situ photothermal surface technique—of ion-irradiated single-crystals of iron, chromium, vanadium, and tungsten at room temperature.
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Effective thermal diffusivity models are useful for predicting thermal diffusivities of heterogeneous materials. The literature contains models that may be broadly categorised into four different types: (1) effective thermal diffusivity for highly specific applications (e.g. empirical curve fitting of measured data); (2) effective thermal diffusivity as a weighted averages of the …
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scanning calorimetry, ASTM E 1952; thermal diffusivity of solids by the laser flash method, ASTME 1461;and the steady-stateheatflow, ASTM C 518 (Ref 60–62). Ceramics, EN 821–2 and ISO 18755, both laser flash (Ref 63, 64) Thermal emittance: Radiometric techniques,
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FIG. S1. SAW frequency of iron, chromium, vanadium and tungsten upon irradiation with self- and Si-ions. grating wavelength and α is thermal diffusivity in the grating vector direction. A, B,C, α, β, θ and τ were fitted while SAW frequency was determined as the peak frequency of the signal in Fourier space. Similar to thermal diffusivity ...
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Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium and vanadium showing little to no change up to damages of the order of 1 dpa. 5 MeV Si3+-ion irradiated tungsten exhibits a reduction of thermal diffusivity from 0.78(7) cm2s−1 to 0.29(2) cm2s−1 with logarithmically ...
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Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium, and vanadium showing little to no change up to damages of the order of 1 dpa. 5 MeV Si3+-ion irradiated tungsten exhibits a reduction of thermal diffusivity from 0.78(7) to 0.29(2) cm2 s−1 with logarithmically ...
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This paper reports the results of transient grating spectroscopy -a rapid, non-destructive, in-situ photothermal surface technique - of ion-irradiated single-crystals of iron, chromium, vanadium …
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Assuming that there are no heat losses, the evaluation of the thermal diffusivity from the T-t behaviour can be made using Parker's equation (Eq. (3)) [8]: (3) α = 0.139 d 2 t 1 / 2 where α is the thermal diffusivity [m 2 s −1], d the thickness of the sample [m] and t 1/2 the time necessary for the back face to reach half of the maximum ...
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Thermal diffusivity measurements of pure iron have been made using a laser flash apparatus (LFA) over the temperature range 25 to 1640°C. These measurements are compared with …
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This paper reports the results of transient grating spectroscopy—a rapid, non-destructive, in situ photothermal surface technique—of ion-irradiated single-crystals of iron, …
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Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium, and vanadium showing little to no change up to damages of the order of 1 dpa. 5 MeV Si3+-ion irradiated tungsten exhibits a reduction of thermal diffusivity from 0.78(7) to 0.29(2) cm(2) s (-1) with logarithmically ...
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Molybdenum, unlike copper, lowered the thermal diffusivity of the gray cast iron, and alloy E (without molybdenum), besides presenting a relatively low carbon equivalent content and an increase in the values of the thermal diffusivity, presented the best performance during the thermomechanical fatigue. The molybdenum present in alloys B and C ...
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In heat transfer analysis, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the rate of transfer of heat of a material from the hot side to the cold side.
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The study of Mg–Fe2+ subsolidus exchange between olivine and spinel is a powerful tool to unravel the thermal history of ultramafic rocks. We have implemented such a study using olivine–spinel diffusivity patterns in fresh mineralogical samples from the Finero mafic-ultramafic Complex in the Ivrea-Verbano zone of Northern Italy. Our analytical suite includes chromitites …
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Abstract The laser flash method was used to measure the thermal diffusivity (a) of carbonyl iron in the temperature range of 300–1700 K with a detailed study of the critical region of 980–1170 K. The initial experimental data in the field of the magnetic phase transformation are processed by the scaling power law. The values of the critical indexes (γ′, γ) for the thermal …
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Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium, and vanadium showing little to no change up to damages of the order ...
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High thermal conductivity chromite sand AFS45-50 is a foundry-grade chromite sand. With a high Cr2O3 content of more than 46% and SiO2 of less than 1%, the chromite sand works excellent as core sand, molding sand, shape sand, and facing sand for casting. The chromite sand from Haixu Abrasives gets high thermal and chill performance after water washing and magnetic removal …
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Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium, and vanadium showing little to no change up to damages of the...
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The effective thermal conductivities in stagnant air of packed beds of fines, lumps, and indurated and pre-reduced pellets of two chromite ores with different chromium-to-iron ratios were …
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Iron oxide and copper chromite are the known burn rate enhancers used in a composite solid propellant. Lot of research has been carried out to understand the mechanism or location of action of the burn rate modifiers so as to better tailor the burning rate of a composite propellant. ... The corresponding thermal diffusivity values obtained for ...
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Thermal diffusivity of the implanted samples measured during the various annealing stages. Each measurement is an average of 5000 laser excitations. The thermal diffusivity measured for pristine tungsten is shown as a grey band. The bounds of the grey region correspond to one standard deviation after averaging over 20 K intervals.
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The thermal conductivity (κ) and the thermal diffusivity (D) are two important thermal param- eters of minerals. In addition to temperature and pressure (Hofmeister, 1999 ; Osako et al., 2004 ; Wang
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vanadium and tungsten at room temperature. Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium and vanadium showing little to no change up to damages of the order of 1 dpa. 5 MeV Si3+-ion irradiated tungsten exhibits a reduction of thermal diffusivity from 0.78(7) cm2s−1
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mended values are given. In the g-Fe phase region the thermal diffusivity can be represented by a563102613.13 31029 (T2911). In the d-Fe phase region the thermal diffusivity can be represented by the constant 0.0731024 m2 s21. In the liquid region up to 1640°C, the thermal diffusivity can be represented by a56.23102611.79310293( T21538). in ...
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The results of the thermal diffusivity measurements for pure iron within the temperature range from 830 K up to 1820 K obtained in automated mode by the dynamic plane temperature wave method have been presented. ... Gorbatov, V.I., Polev, V.F., Korshunov, I.G. et al. Thermal diffusivity of iron at high temperatures. High Temp 50, 292–294 ...
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