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[en] The ASTM T92 steel was corroded at 600 ℃ and 800 ℃ at 1 atm of N_2/3.1%H_2O/2.42%H_2S-mixed gas. The formed scales were thick and fragile. They consisted primarily of the outer FeS scale and the inner (FeS, FeCr_2S_4)-mixed scale containing a small amount of the Cr_2O_3 scale. This indicated that corrosion occurred mainly via sulfidation rather than oxidation due to the H_2S gas. Since FeS was present throughout the whole scale, T92 steel was non-protective, displaying high corrosion rates.
[en] Biaxially oriented polyethylene terephthalate copolymer(BO-PET) film laminated aluminiums have been applied for chip condenser case. The BO PET film is characterized by high molecular which gives high corrosion resistance, good adhesion and high heat resistance. The higher orientation lowers formability of the film. So, optimum orientation has to be controlled during the laminating process. And to confirm the adhesion between BO PET and aluminium and to guarantee the formability of PET laminated aluminums, we have controlled the chromium oxides weight on the aluminium and laminating condition (laminating temperature, soaking temperature and lag time after nip roll and quenching conditions). This paper discusses the effect of the laminating conditions on the formability of laminated aluminums. As results, it is clear that the orientation of the BO PET film decreased with an increase in the strip temperature. When the film temperature is over the melting point of the film, its orientation drastically decreased
[en] Possible exchange mechanisms between sites with two electrons in three orbitals subject to strong Hund's rule correlations are studied. While three itinerant orbitals lead to antiferromagnetism, one localized and two itinerant orbitals give rise to ferromagnetism. The results are discussed in the context of the half-metallic ferromagnet CrO2
[en] The hot corrosion behavior of Ni20Cr alloy was evaluated in NaVO3 at temperatures of up to 700 °C and compared to Inconel 600. The performance of both the alloys was evaluated using electrochemical measurements, such as potentiodynamic polarization, linear polarization resistance, and electrochemical impedance spectroscopy measurements, as well as a cyclic corrosion test. The results show that the Ni20Cr alloy has better corrosion performance than the Inconel 600. The better performance of the Ni20Cr alloy was due to its ability to develop a stable protector oxide (Cr2O3) on its surface.
[en] Model Fe–20Cr (wt.%) alloy, exposed to Ar–20CO2 at 650 °C, formed a protective Cr2O3 scale, but nonetheless carburized. Atom probe analysis shows that carbon penetrates the scale via oxide grain boundaries
[en] The experimentation on solar absorber and collector is mandatory so as to have their effective utilization in energy intensive sectors. In this connection, experimentation in connection with the characterization of nano carbon and Cr2O3 (60:40) coated solar absorber was carried out. In addition, experimentation in connection with the estimation of efficiency of solar collector and device was carried out as per BIS specifications. The outcomes of experimentation on solar absorber revealed that the crystallite sizes in the carbon and Cr2O3 (60:40) coating on absorber were in nano ranges. The outcomes of experimentation on solar collector and device revealed that the instantaneous thermal performances of solar flat plate collector ranged between 66.9% and 68.6% and energy collection efficiency of solar heating device was 51.4%. As the thermal performances of the solar collector and device could distinctively depend on the optical characteristics of the absorbers, it could be concluded that nano carbon and Cr2O3 (60:40) coated solar absorbers would be effectively used in solar collectors and heating devices. (author)
[en] Spinel cobalt chromite, CoCr_2O_4 which exhibits multiferroic behaviour have gained considerable attention in recent years due to rich physics lying behind these compounds along with their technological applications. CoCr_2O_4 is found to exhibit a collinear ferrimagnetic (FIM) ordering, a magneto-structural transition and a lock in transition at Tc ∼ 94 K, Ts ∼ 25 K and TL∼ 13 K, respectively. In order to see the influence of substitution effect, in this brief report we have chosen Mn to substitute at Cr site. Room temperature neutron diffraction studies were carried out on polycrystalline Co(Cr_1_-_xMn_x)_2O_4 (x=0.00 and 0.30) samples to determine structural properties. By studying the magnetic properties of the Mn substituted samples one can see how the crystal structure and magnetic transitions are getting affected. Magnetic measurements show evidence on the enhancement of T_c and T_s with the Mn substitution. We report here the effect of a Mn substitution on structure and magnetic properties of multiferroic CoCr_2O_4. (author)