ANODIC PROCESSES FOR ELECTROWINNING OF Sb FROM JAMESONITE CONCENTRATE

The anode reaction and current density of the electrowinning of Sb from jamesonite concen-trate have been investigate.High anodic current density seems to be the major reason for highenergy consumption,air pollution by alkaline mists in workshop as well as poor quality ofdeposition.A series of steps,such as absorption,phase formation,ageing of passivated filmsetc.,were found to be involved during the anodic passivating process of Fe in NaOH solution.A new anodic material Fe/Ni/Co_3O_4 was developed so as to save the d.c.electric energyover 160 kWh/t of Sb.     

ENFLUENCE OF DEFORMATION AT MARTENSITE STATE ON SHAPE RECOVERY IN CuZnAl MEMORY ALLOYS

An investigation of the influence of deformation on shape recovery has been put forward inCu-Zn-Al shape memory alloys.Starting at a model of the re-orientation of martensitic va-riants,the principle and essentiality of the influence of the amount of pre-deformation ε onshape recovery rate η is elucidated.     

STEREOLOGICAL CHARACTERIZATION OF MICROSTRUCTURAL EVOLUTION AT LATE STAGES OF SINTERING FOR NICKEL POWDER COMPACTS

The evolution of both the metric and topological properties of the microstructure for Ni pow-der compacts at the late stages of sintering(V_v~s>0.90)has been investigated by means ofstereological method.The effects of precompaction pressure and loose sintering have been stu-died and discussed.     

FATIGUE BEHAVIOUR OF GRANULAR BAINITE STRUCTURE

The strain fatigue,impact fatigue and rotation beam fatigue behaviour of granular bainiticstructure has been studied.The results show that the strain fatigue properties and the impactfatigue properties of granular bainite are superior to that of tempered martensite under thecondition that the ultimate tensile strength is equal.The impact.fatigue life increases with in-creasing amount of granular bainite,because the M-A islands might retard the propagationof fatigue crack.The rotation beam fatigue properties of granular hainite are similar to thatof tempered martensite.The relationship between.fatigue limit S_f,yield strength σ_y and frac-ture strength S_k may be expressed asS_f=4.651+0.1411(σ_y+S_k)     

PHOSPHORUS SEGREGATION AND ANNEALING TEXTURE IN A LOW CARBON STEEL SHEETS

The present work is to study the effect of phosphorus on the annealing texture of a low carbonsteel at different cold rolling and annealing condition by means of pole-figure,inverse-polefigure and orientation distribution function(ODF)method.The microstructure and distribu-tion of phosphorus in steel sheet are studied by means of metallography,scanning electron mi-croscope(SEM)and electron probe microanalysis(EPMA).The results show that phos-phorus promotes the formation of the fiber texture of〈011〉parallel to the rolling direc-tion and〈111〉normal to the sheet surface.The texture was found to be affected mainlyby preannealing temperatures,promoted at 390 or 590℃,and retarded at 490℃.At thepreannealing temperature promoting the formation of texture,phosphorus segregation to theinterior of grains was observed.It seems that the formation of the fiber texture may be associ-ated with the segregation of phosphorus.     

MAGNETIC PROPERTIES OF AMORPHOUS CoZr SOFT MAGNETIC FILMS

The amorphous CoZr soft magnetic films with superior properties were prepared byradio-frequency sputtering under pressure of 0.5Pa Ar.The saturation magnetization of theamorphous CoZr films with relation to the Zr content and temperature was investigated.Theamorphous CoZr films composed of different constituents obey the Bloch T~(3/2)-low in a widerange of temperatures.The number of electrons transferred from each Zr atom to 3d energyband of Co calculated by the rigid band model is about 2.27.     

扁平绕带式容器和整体包扎式容器的综合对比分析

扁平绕带式容器和整体包扎式容器是２种无深环焊缝的多层高压容器，围绕着压力容器的基本要求，从材料用量、使用安全性、制造经济性及端部结构等方面对其进行了综合对比分析。     

塔里木盆地南部早二叠世孢粉组合及植物区系

塔里木盆地南部早二叠世孢粉植物群可分为Striolatospora-Qipanapollis(SQ)组合和Potonieisporites-Vestigisporites(PV)组合,时代为早二叠世早、中期.对孢粉植物群特征的分析表明,在早二叠世早、中期,属于欧美植物群范畴,并非以往所认为的属于华夏植物群,也未发生所谓的四大植物区系的混生现象.对塔里木地块当时古地理位置的讨论结果亦支持这一结论.     

Numerical evaluation of J2-integral for rubbery materials under dynamic loads with finite element method

The J₂-integral for rubbery material problems with a stationary crack under dynamic large deformation is calculated with finite element solutions. General 2-D problems, including plane stress, plane strain, and axisymmetric cases, are considered in the formulation. The numerical procedure is verified to be path-independent in a generalized sense, and the near-tip region is hence always included in the calculation. A numerical treatment for simulation of the integration around the near-tip area is therefore proposed. It is demonstrated numerically that, with this treatment, the calculation is very insensitive to the crack tip finite element grid. In fact, no detailed information on the complicated asymptotic dynamic singular behavior for rubbery materials is required in the calculation.     

塔里木盆地泥盆—石炭纪转换期层序地层学

对塔里木盆地塔西南、巴楚、满西、和田河、塔中及塔北地区晚泥盆世晚期至早石炭世早期地层进行了层序地层分析,识别出两个层序(相当Vail等提出的三级层序),认为这一时期塔里木盆地经历了两次较大规模的海平面升降运动.通过层序地层和生物地层研究认为,古塔里木海晚古生代发生的海侵起始于晚泥盆世法门晚期;“东河砂岩”的时代为晚泥盆世法门晚期.