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Enhancement of shear stability of a Fe-based amorphous alloy using electrodeposited Ni layers

Journal of Materials Science & Technology 2018年第12期34卷 2283-2289页

作者： Y.C.Wang X.M.Luo L.J.Chen H.W.Yang B.Zhang G.P.Zhang School of Materials Science and Engineering Shenyang University of Technology Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern University

Tensile and fracture behaviors of sandwich-structured composites consisting of a Fe-based amorphous layer with a constant thickness and ultrafine-grained Ni layers with different thicknesses were investigated. The results indicate that the initiation and the stable propagation of the shear band in the amorphous layer was dominated by the Ni layers due to their strong constraint role. The catastrophic fracture of the amorphous layer was postponed in the sandwich composites through properly increasing the constrained Ni layer thickness, which effectively decreased the shear stress on the shear fracture planes of the amorphous layer, and thus led to stable propagation of the primary SB characterized by the increase in the smooth region size of the shear band.

关键词： Sandwich-structured composites Amorphous alloy shear stability Plasticity Fracture

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Removal of Cd(Ⅱ)from dilute aqueous solutions by complexation–ultrafiltration using rotating disk membrane and the shear stability of PAA–Cd complex

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Chinese Journal of Chemical Engineering 2019年第3期27卷 519-527页

作者： Liang Chen Yunren Qiu School of Chemistry and Chemical Engineering Central South University

Removal of cadmium(Ⅱ) ions from dilute aqueous solutions by complexation–ultrafiltration using rotating disk membrane was investigated. Polyacrylic acid sodium(PAAS) was used as complexation agent, as key factors of complexation, pH and the mass ratio of PAAS to Cd^(2+)(P/M) were studied, and the optimum complexation–ultrafiltration conditions were obtained. The effects of rotating speed(n) on the stability of PAA–Cd complex was studied with two kinds of rotating disk, disk Ⅰ(without vane) and disk Ⅱ(with six rectangular vanes) at a certain range of rotating speed. Both of the rejection could reach 99.7% when n was lower than 2370 r·min^(-1) and 1320 r·min^(-1), for disk I and disk Ⅱ, respectively. However, when rotating speed exceeds a certain value,the critical rotating speed(n_c), the rejection of Cd(Ⅱ) decreases greatly. The distribution of form of cadmium on the membrane was established by the membrane partition model, and the critical shear rate(γ_c), the smallest shear rate at which the PAA–Cd complex begins to dissociate, was calculated based on the membrane partition model and mass balance. The critical shear rates(γ_c) of PAA–Cd complex were 5.9 × 10~4 s^(-1), 1.01 × 10~5 s^(-1),and 1.31 × 10~5 s^(-1) at pH = 5.0, 5.5, and 6.0, respectively. In addition, the regeneration of PAAS was achieved by shear induced dissociation and ultrafiltration.

关键词： Complexation-ultrafiltration Membrane Regeneration shear stability Critical shear rate shear induced dissociation

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Drag reduction behavior of hydrolyzed polyacrylamide/xanthan gum mixed polymer solutions

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Petroleum Science 2017年第2期14卷 412-423页

作者： Mehdi Habibpour Peter E. Clark School of Chemical Engineering Oklahoma State University Stillwater OK 74078 USA

Partially hydrolyzed polyacrylamide（HPAM）as the main component of slickwater fracturing fluid is a shear-sensitive polymer,which suffers from mechanical degradation at turbulent flow *** different concentrations of HPAM as well as mixtures of polyacrylamide/xanthan gum were prepared to investigate the possibility of improving shear stability of *** reduction（DR）measurements were performed in a closed flow *** HPAM solutions,the extent of DR increased from 30%to67%with increasing HPAM concentration from 100 to1000 *** the HPAM solutions suffered from mechanical degradation and loss of DR efficiency over the shearing *** indicated that the resistance to shear degradation increased with increasing polymer *** efficiency of 600 wppm xanthan gum（XG）was 38%,indicating that XG was not as good a drag reducer as *** with only 6%DR decline,XG solution exhibited a better shear stability compared to HPAM *** HPAM/XG solutions initially exhibited greater DR（40%and 55%）compared to XG,but due to shear degradation,DR%dropped for HPAM/XG *** to 200 wppm HPAM solution,addition of XG did not improve the drag reduction efficiency of HPAM/XG mixed solutions though XG slightly improved the resistance against mechanical degradation in HPAM/XG mixed polymer solutions.

关键词： Slickwater Polyacrylamide Xanthan gum Drag reduction shear stability

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