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Yefei Li - One of the best experts on this subject based on the ideXlab platform.
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effects of Boron Concentration on the corrosion resistance of fe b alloys immersed in 460 c molten zinc bath
Surface & Coatings Technology, 2010Co-Authors: Jian Dong Xing, Hanguang Fu, Dawei Yi, Yefei LiAbstract:Abstract In order to investigate the effects of Boron Concentration on the corrosion resistance of Fe–B alloys in molten zinc, Fe–B alloys, with the Boron Concentrations of 1.5 wt.%, 3.5 wt.% and 6.0 wt.% respectively, were dipped into a pure molten zinc bath at 460 °C and kept in different time intervals. The results show that, in comparison with 1Cr18Ni9Ti stainless steel, Fe–B alloy with 3.5 wt.%B exhibits excellent corrosion resistance, due to the dense continuous network or parallel Fe2B phase which hinders the Fe/Zn interface reaction in Fe–B alloys. The energy dispersive spectrum (EDS) results indicate that the coarse and compact δ phase with the length about 40 μm generates near the matrix of Fe–B alloy and massive ζ phase occurs close to the liquid zinc. The corrosion process includes Fe/Zn reaction and the isolation and fracture of Fe2B. The failure of boride is mainly caused by the microcrack.
Andres Cuevas - One of the best experts on this subject based on the ideXlab platform.
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effect of Boron Concentration on recombination at the p si al2o3 interface
Journal of Applied Physics, 2014Co-Authors: Lachlan E Black, Thomas Allen, Keith R Mcintosh, Andres CuevasAbstract:We examine the surface passivation properties of Al2O3 deposited on Boron-doped planar ⟨100⟩ crystalline silicon surfaces as a function of the Boron Concentration. Both uniformly doped and diffused surfaces are studied, with surface Boron Concentrations ranging from 9.2 × 1015 to 5.2 × 1019 cm−3. Atmospheric pressure chemical vapor deposition and thermal atomic layer deposition are used to deposit the Al2O3 films. The surface recombination rate of each sample is determined from photoconductance measurements together with the measured dopant profiles via numerical simulation, using the latest physical models. These values are compared with calculations based on the interface properties determined from capacitance–voltage and conductance measurements. It is found that the fundamental surface recombination velocity of electrons, Sn0, which describes the chemical passivation of the interface, is independent of the surface Boron Concentration Ns for Ns ≤ 3 × 1019 cm−3, and in excellent agreement with values ca...
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Boron-oxygen defect in Czochralski-silicon co-doped with gallium and Boron
Applied Physics Letters, 2012Co-Authors: Maxime Forster, Erwann Fourmond, Fiacre E. Rougieux, Andres Cuevas, Raira Gotoh, Kozo Fujiwara, Satoshi Uda, Mustapha LemitiAbstract:We study the Boron-oxygen defect in Si co-doped with gallium and Boron with the hole density 10 times higher than the Boron Concentration. Instead of the linear dependence of the defect density on the hole density observed in Boron and phosphorus compensated silicon, we find a proportionality to the Boron Concentration. This indicates the participation of substitutional, rather than interstitial, Boron in the defect complex. The measured defect formation rate constant is
Jian Dong Xing - One of the best experts on this subject based on the ideXlab platform.
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effects of Boron Concentration on the corrosion resistance of fe b alloys immersed in 460 c molten zinc bath
Surface & Coatings Technology, 2010Co-Authors: Jian Dong Xing, Hanguang Fu, Dawei Yi, Yefei LiAbstract:Abstract In order to investigate the effects of Boron Concentration on the corrosion resistance of Fe–B alloys in molten zinc, Fe–B alloys, with the Boron Concentrations of 1.5 wt.%, 3.5 wt.% and 6.0 wt.% respectively, were dipped into a pure molten zinc bath at 460 °C and kept in different time intervals. The results show that, in comparison with 1Cr18Ni9Ti stainless steel, Fe–B alloy with 3.5 wt.%B exhibits excellent corrosion resistance, due to the dense continuous network or parallel Fe2B phase which hinders the Fe/Zn interface reaction in Fe–B alloys. The energy dispersive spectrum (EDS) results indicate that the coarse and compact δ phase with the length about 40 μm generates near the matrix of Fe–B alloy and massive ζ phase occurs close to the liquid zinc. The corrosion process includes Fe/Zn reaction and the isolation and fracture of Fe2B. The failure of boride is mainly caused by the microcrack.
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Influence of Boron Concentration on the Corrosion Resistance of High Boron White Cast Iron to Liquid Zinc Bath
Key Engineering Materials, 2010Co-Authors: Sheng Qiang, Jian Dong Xing, Da Wei Yi, Jianjun Zhang, Sheng Chao, Guofeng LiuAbstract:The influence of Boron Concentration on corrosion resistance of high Boron white cast iron dipped into a pure liquid zinc bath at 460°C was investigated. The results reveal that high Boron white cast iron containing 3.5 wt.%B exhibits excellent corrosion resistance due to the dense continuous netlike or parallel Fe2B phase which hinders the Fe/Zn interface reaction. The corrosion rate decreases significantly when the Boron Concentration increases, but the corrosion rate declines slightly when the Boron Concentration exceeds 3.5wt.%. EDS results indicate the coarse and compact δ phase generated near the matrix and a large amount of massive and blocky phase occurred close to the liquid zinc. The corrosion process includes Fe/Zn interface reaction and the spalling and fracture of Fe2B. The failure of Fe2B is mainly caused by the microcrack of phase transformation.
P.v. Perkins - One of the best experts on this subject based on the ideXlab platform.
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the consideration of soil Boron adsorption and soil solution Boron Concentration as affected by moisture content
Geoderma, 1995Co-Authors: P.v. PerkinsAbstract:Concentration-adsorption-moisture equations (CAM equations) were developed that enabled adsorbed Boron and the Boron Concentration at any soil moisture content to be calculated from the measured Boron Concentration and moisture content of a saturated water extract, the bulk density and the measured coefficients defining the Langmuir and Freundlich Boron adsorption isotherms. The CAM equations were used to calculate the variation in Boron Concentration as a function of moisture content for three minespoils. Both Freundlich and Langmuir solutions to the CAM equations were tested against experimentally determined Boron Concentrations of the minespoils for moisture contents between 200 and 1200 1/m3. Both isotherm solutions to the CAM equations explained the experimentally determined variation in Boron Concentration as a function of moisture content to a high degree of accuracy. For two minespoils the Freundlich isotherm solution to the CAM equations provided the best fit to experimental data, for one minespoil the Langmuir solution to the CAM equations was better. Also the CAM equations were used to predict potential Boron phytotoxicity problems associated with seasonal moisture content variations within one of the minespoils and the implications of ameliorating the minespoil with pulverised fuel ash (PFA).
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Mathematical modelling of soil Boron Concentration under field moisture conditions using the langmuir and freundlich adsorption isotherms
Communications in Soil Science and Plant Analysis, 1994Co-Authors: P.v. PerkinsAbstract:Abstract Equations were developed that enabled the Boron Concentration at any soil moisture content to be calculated from measured Boron Concentrations and water contents of a saturated water extract, the bulk density and the measured coefficients defining the Langmuir and Freundlich Boron adoption isotherms. The Concentration‐adsorption‐moisture equations (CAM equations) have been tested against experiment data for three soils and two minespoils over a range of moisture oonditions. Also the CAM equations were used to predict potential Boron phytotoxicity problems associated with the amelioration of acidic minespoils with pulverised fuel ash.
Paul W. J. Taylor - One of the best experts on this subject based on the ideXlab platform.
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Physiological mechanisms of tolerance to high Boron Concentration in Brassica rapa.
Functional Plant Biology, 2006Co-Authors: Sukhjiwan Kaur, Marc E. Nicolas, Rebecca Ford, Robert Norton, Paul W. J. TaylorAbstract:Tolerance to high Boron Concentration in Brassica rapa was primarily due to low net Boron uptake by the roots. However, in the two tolerant genotypes, 39-43% of Boron uptake was retained in the tap roots, which limited Boron accumulation in the leaves, and also contributed to Boron tolerance. In the sensitive genotype, 99% of the increase in Boron uptake caused by high soil Boron accumulated in the leaves, particularly in the leaf margins. Despite higher transpiration rates, lower net Boron uptake occurred in the tolerant genotypes. This result cannot be explained by passive Boron uptake alone. Active Boron efflux was probably responsible for differences in net Boron uptake among tolerant and sensitive genotypes. Boron Concentration was much lower in the cell walls than in the cell sap of leaves, indicating that storage of Boron in the cell walls was not a tolerance mechanism. Despite high Boron Concentrations in the leaf symplasm, rates of photosynthesis, transpiration and growth were almost unaffected in the tolerant genotypes. The results demonstrate that Boron tolerance in Brassica rapa involves Boron exclusion at the root level, Boron partitioning away from leaves and, as Boron accumulates in leaves despite the first two mechanisms, Boron tolerance of the leaf tissue itself.