日本JFE将向中国供应石油罐用厚板

最近 ,中国石化公司通过国际招标采购 110 0 0t厚板 ,这些材料将用来生产总容积为 16 10万m3 的原油储藏罐。此次投标的公司包括日本JFE钢铁、住友金属及中国武钢。最终中标的公司是日本JFE钢铁公司 ,合同要求厚板抗张强度达到 6 0kg/mm2 ,交货期为 2 0 0 4年 10月 - 2 0 0 5年     

无汞锌粉制备工艺研究

以 0 # 蒸馏锌为原料 ,加入铟等合金元素 ,采用喷射雾化法制备了无汞锌粉。试验考查了合金组成、雾化气体压力、金属液流直径、熔炼和保温温度等对制备过程和样品性能的影响 ,通过优化和综合试验确定了经济合理的制备工艺条件 :合金成分为Zn - 0 0 5 %In - 0 0 2 5 %Pb -0 0 2 5 %Bi- 0 0 0 5 %Al;熔炼温度 660℃ ;保温温度 660℃ ;雾化交角 4 5°;雾化喷射气体 :干燥空气0 4 5MPa;金属液流直径 :4mm ;粉末收率 (单次喷粉 ,5 0～ 5 0 0 μm) 65 % ;按原料计总收率 :>95 %。对制得的无汞锌粉样品进行了性能测试和电池应用试验。     

大吸气量新型吸氢材料的研究

主要介绍了一种新的非蒸散型大吸气量吸气材料。该材料由金属锆及其金属间化合物Zr Al16和Zr V Fe经真空烧结制成。通过吸气性能测试装置、X射线、扫描电镜等测试手段对材料吸氢性能及显微结构进行了分析。结果表明该材料具有比同类代表产品更优异的吸氢性能 ,并且在低温和高温条件下都具有好的吸氢能力。在 5 0 0℃低温激活第 10min吸气速率S10 达到 5 136 .5ml·s-1·g-1,特征吸气量Q10 达到 1835 14ml·Pa·g-1;80 0℃高温激活 10minS10 达到ml·s- 1·g-1,Q10 达到 2 2 4 936ml·Pa·g-1。     

外科植入物用新型TAMZ合金的生物学性能（Ⅲ）

4　TAMZ合金的口腔粘膜刺激性能4 .1　材料与方法4 .1 .1　材料( 1 )试验材料 :将 TAMZ合金加工成5mm× 0 .5mm的圆片 ,共 1 0片 ,圆片中央制备 4个等距离小孔 ,表面及周边光滑圆钝。( 2 )对照材料 :阴性对照材料为口腔科用牙胶 ,阳性对照材料为工业用聚氯乙烯 ,同样要求为 5mm× 0 .5mm的圆片 ,中央制备 4个等距的小孔 ,表面及周边光滑圆钝 ,各 1 0片。( 3)消毒 :将试验材料及阳性对照材料用 95%酒精超声清洗 1 5min,三蒸水冲洗 3遍。试样材料采用高压消毒。阳性材料及阴性对照材料采用 Co60照射消毒。( 4 )试验动物 :选用健康 ,口…     

安钢90/105m2烧结机成品线除尘器改造

ZC72 -Ⅱ - 4 0 0型布袋除尘器是一种应用广泛的高效除尘器。然而 ,在实际运用中都没有达到应有的控制要求。从除尘工艺要求出发 ,简述了ZC72 -Ⅱ - 4 0 0型布袋除尘器改造及效果     

爆炸焊接钛-钢双金属材料热轧后的组织与性能

爆炸焊接钛 -钢双金属材料的热压加工情况十分复杂 ,由于加热时所形成的金属间化合物中间层的厚度不同 ,实际上可能会使双金属材料的强度降至零。俄罗斯伏尔加市国立工业大学研究了在最佳工艺制度下得到的爆炸焊接 BT1- 0钛与 CT3钢双层复合材料热轧 (轧制温度70 0℃和 80 0℃ )时的变形与强化过程。在拉伸试验时由于沿结合界面施加了 36 0 MPa～5 0 0 MPa的张力而保证了试样稳定的断裂 ,结合界面的显微硬度为 :钢 ,2 4 0 0 MPa～32 0 0 MPa;Ti,2 5 0 0 MPa～ 310 0 MPa。试样为楔形状 ,其钢层厚度为 4 .6 mm,钛层厚度沿长度方向变化…     

制动速度对铜基粉末冶金闸片材料摩擦学性能的影响

以Sn+SiO_2+Al_2O_3+CaF_2作为摩擦组元,石墨+Pb作为润滑组元,制备铜基粉末冶金列车闸片材料,在MM-1000Ⅱ型摩擦试验机上进行摩擦试验,测定制动速度在120~200 km/h范围内材料的摩擦因数、磨损量与表面温度,并观察摩擦表面形貌,研究制动速度对该材料摩擦学性能的影响。结果表明:在制动速度180 km/h时,随制动速度增加,闸片材料的摩擦因数在0.41~0.46之间波动,但制动速度达到200 km/h时,摩擦因数显著减小至0.32,摩擦因数稳定性总体较好。材料的磨损量随制动速度增大而增加,但在制动速度达到180 km/h时磨损量趋于稳定,为119 mg。低速制动下材料的磨损机理主要为疲劳磨损,高速制动时主要为磨粒磨损和氧化磨损。     

金属注射成形材料新版标准即将出版

美国金属粉末工业联合会将出版2 0 0 3年金属注射成形新版标准,新版标准不仅包括更多的有关MIM 17 4PH材料和MIM 4 30不锈钢的性能标准,还增加了牌号为MIM 4 2 0的不锈钢新产品。新版标准还将增加2种新的测试方法,这两种方法分别是:测量金属注射成形材料抗硫酸腐蚀的试验方法和使用比重计测量金属注射成形制品密度的方法。有关金属注射成形材料新试验数据的获得和新标准的起草工作仍在进行中,美国金属注射成形标准委员会已经委托有关实验室对MIM F 15合金的线胀系数、抗拉性能、杨氏模量及泊松比进行了测量,美国金属注射成形标准委员…     

冶金新书介绍

新世纪冶金科技导游中国冶金报社科技部　编　　定价 30 .0 0元ISBN 7- 5 0 2 4 - 2 94 1- 7/N .19本书包括冶金史话、地质矿山、金属世界、冶金技术、金属材料、金属加工、金属与健康、冶金趣闻等。高炉炼铁过程优化与智能控制系统刘祥官等　著　　定价 2 8.0 0元ISBN 7- 5 0 2 4 - 32 2 2 - 1/TF .4 5 1本书作者根据在厂校从事生产、科研、教学和理论工作的成果 ,阐述了研发高炉炼铁优化“专家系统”的过程及其应用效果。是计算机、自动化与数学模型专业人员开发“专家系统”的参考书 ,也是高炉炼铁专业人员使用“专家系统”的技术说…     

耐腐蚀性强的新合金材料

日本住友金属工业公司制成了一种耐腐蚀性强的新合金材料。经试验 ,这种合金材料在 5 0 0℃的高温高压蒸气条件下 ,2 4ｈ后也没有出现腐蚀现象 ;即使把蒸气温度提高到 5 30℃ ,也无腐蚀现象。这种新型材料是在泽卡洛伊锆锡金属中加入铌、钼、钨和钒 4种金属元素 (加入量均为合金重量的 0 .1% )制成的耐腐蚀性强的新合金材料@李惠萍     

Impact of the Electromagnetic Brake Position on the Flow Structure in a Slab Continuous Casting Mold: An Experimental Parameter Study

Metallurgical and Materials Transactions B - Flow measurements are performed in a slab model for continuous casting of steel under the influence of a ruler type Electromagnetic Brake (EMBr). The...     

Applicability of drivers' electrodermal response to the design of the traffic environment.

Measured electrodermal response, heart rate, and muscular activity for 60 Ss driving a rural test route. Brake pressure and steering wheel angle were also recorded, and traffic events encountered were categorized by the experimenter using a keyboard. Traffic event categories were then rank ordered according to magnitude of response. For electrodermal response and brake pressure, a correlation coefficient of .95 was obtained. Time sequence analyses of the drivers' physiological responses and motor activity showed that electrodermal responses were induced by the mental effort of the driving task rather than the physical effort necessary to maneuver the vehicle. Results have ergonomic implications for highway design. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Physical Simulation of Nozzle Electromagnetic Brake in Twin‐Roll Strip Casting

This paper presents the Nozzle Electromagnetic Brake (N‐EMBR) technology for twin‐roll strip continuous casting. N‐EMBR consists of imposing a stationary magnetic field coupled with direct current inside the nozzle to control the flow and suppress the free surface fluctuation. A low melting point metal model was set up to examine the magnetic field and additional current effect on the velocity near the meniscus and free surface fluctuation. The experimental results showed that the velocity near the meniscus, the amplitude and main frequency of the free surface fluctuation were all decreased with the N‐EMBR technology. It was found that the N‐EMBR technique can be applied successfully in twin‐roll strip casting to suppress the flow near the meniscus and free fluctuation.     

立式电磁制动对不同水口角度下连铸结晶器内流场的控制

利用Fluent软件模拟计算了常规板坯连铸和立式电磁制动板坯连铸过程,详细研究了不同水口出口角度结晶器内三维流场,为评价立式电磁制动技术的冶金效果提供理论依据.研究表明:常规连铸过程水口出口角度增加时,不利于夹杂物的上浮,影响铸坯质量;不同水口出口角度连铸过程应用立式电磁制动技术后,自由表面钢液流速、钢液主射流的运动速度和下回流区的冲击深度显著减小,利于稳定液面波动、减少卷渣、防止漏钢和促进夹杂物的上浮,符合立式电磁制动技术的设计思想.     

Dietary arginine and lysine in Large White toms. 1. Increasing arginine:lysine ratios does not improve performance when lysine levels are adequate

A study was conducted utilizing two strains of male Large White turkeys (BUT Big 6 and Nicholas 700) to determine the effects of increasing Arg:Lys ratios on live performance and carcass composition. Diets were formulated to provide 100, 110, and 120% of NRC (1994) Lys levels, adjusted for dietary energy level, with Arg:Lys ratios of 1.0:1, 1.1:1, 1.2:1, and 1.3:1 in a 3 x 4 factorial arrangement. Eight pens of 15 poults (four pens of each strain) were fed each of the 12 test diets for an 18-wk period. Diets were changed at 3-wk intervals rather than the 4-wk interval suggested by NRC. The results of this study suggest that the Arg and Lys levels suggested by the NRC (1994) are not sufficient when diets are fed on 3-wk intervals, rather than the 4-wk intervals suggested by NRC. This conclusion is in agreement with the studies of Waldroup et al. (1997b). Increasing Arg:Lys ratios improved performance of turkeys only when the diets contained insufficient amounts of Arg in association with low levels of Lys. Increasing Arg:Lys ratios when diets contained sufficient amounts of these two amino acids was without benefit, in contrast to the report of Brake et al. (1994). Turkeys of the BUT Big 6 strain appeared to be more sensitive to marginal deficiencies of Lys and Arg than did turkeys of Nicholas 700 strain.     

W-Cu(Mo-Cu)复合材料的研究进展

W-Cu或Mo-Cu两相复合材料具有较高的导热性和较低的热膨胀系数,在大功率器件中被视为一种很好的热沉材料。近年来,有关W-Cu或Mo-Cu作为电子热沉材料的研究在国内外已有一些报道。作者主要就近几年钨铜复合材料研究的几个主要热点问题进行综述报道。分析认为,梯度结构功能材料、纳米结构材料以及注射成形工艺在钨铜复合材料领域中的应用是当今钨铜电子材料发展的主要方向,同时对国内外最新研究进行了归纳总结,指出了今后发展的主要动向。     

锰在功能材料中的应用

介绍了锰在磁性材料中的应用、锰在形状记忆合金中的应用、锰在储氢材料中的应用及其作用机理，展示了锰在功能材料中的重要作用，对进一步挖掘锰的应用潜力有一定意义。     

镁质修补料研究及其在中频感应炉上的应用

以中档镁砂为主要原料,硅微粉、三聚磷酸钠或六偏磷酸钠为结合剂,925高铝水泥为固化剂,铬微粉与α-A12O3微粉为修补料的微粉原料,研究了结合剂种类与加入量,微粉加入量与添加方式对镁质修补料性能的影响。并介绍了镁质修补料在0.5t中频感应炉坩埚上的实际应用效果。     

Effects of Rare Earths on Properties and Microstructure of Automotive Friction Materials

Rare earth compounds as modifiers used widely in modern friction materials can enhance the interracial binding of constituents of materials and improve the comprehensive properties of materials evidently. However, there are still few reports on application of rare earth in automotive friction materials. In order to study the effect mechanism of rare earths in friction materials, a rare earth compound was selected as additive and the effects of materials doped with or without rare earth on friction and wear properties of materials were studied. The microstructure and worn surface morphology were observed by scanning electron microscopy and the macro performance was discussed. Worn surface element constitution of materials was analyzed by energy dispersive spectroscopy. Effect mechanism of rare earths on friction and wear behaviors of friction materials were discussed. The results show that doping rare earths in friction materials can stabilize friction Coefficient, lower the wear rate of materials and increase the impact strength of materials. The flexibility and fracture resistance of materials is greatly improved. Worn surface of materials doped with rare earth is compact and the surface adhesion is greatly enhanced.     

FATIGUE BEHAVIOUR OF SINTERED METALS AND ALLOYS

Abstract

Published information on the fatigue behaviour of sintered materials is reviewed.

Porous sintered materials exhibit similar fatigue characteristics to cast and wrought materials, including fatigue limits in ferrous materials. Their endurance ratios are slightly lower than those of similar wrought materials and they may depend on porosity content. In some cases fatigue data for sintered materials show less scatter than those for similar wrought materials. The total porosity content, which is mainly determined by compacting conditions, is the most important factor influencing fatigue behaviour. Endurance limit decreases as the porosity content increases. In the copper- and iron-base materials investigated, fatigue behaviour is influenced only slightly by powder characteristics, sintering temperature, atmosphere, and time, and by post-sintering treatments. Environmental and surface conditions seem to influence the fatigue behaviour in the same manner as pore-free materials. However, notches have a less severe effect than on pore-free materials. Fatigue fracture appears to occur in the same manner as in pore-free materials. Fatigue cracks tend to start at the free surface of the specimen in preference to the internal surfaces of pores, in agreement with theoretical predictions. Sintered low-alloy steels can be heat-treated to give a wide range of fatigue strengths, and they are less notch-sensitive than pore-free steels. The fatigue properties of sintered and pore-free materials are compared and sintered materials are shown to possess fatigue strengths in the same range as cast and wrought materials.