铜铝薄板轧制复合工艺

针对电子、散热等器件对铜铝复合材料的需求,开发了铜铝薄板复合轧制技术,采用实验方法对轧制复合工艺进行了优化.研究了铜铝复合薄板轧制厚比的变化规律,并通过不同的退火工艺,研究了铜铝轧制复合界面变化过程.结果表明：铜铝复合临界轧制压下率随铜厚比例的增加而减小,铜铝组元压下率与总压下率之间成正比关系,随着轧制压下率的增大,各组元压下率也成增长趋势.退火处理可以提高薄板的弯折性能,但当温度过高时,在铜铝界面会产生脆硬的金属化合物,严重影响铜铝复合板的结合强度.     

退火工艺对冷轧铜/钢/铜复合板界面组织和力学性能的影响

采用冷轧复合法成功制备了铜/钢/铜复合钢板,利用OM、EPMA手段分析了铜/钢/铜复合板界面组织和合金元素扩散,研究了退火处理对铜/钢/铜复合板界面组织和力学性能的影响.试验结果表明,碳钢中铁原子与铜中铜原子发生互扩散现象,生成Fe-Cu固溶扩散层.随着退火温度的升高和保温时间的增加,扩散层厚度都会变大.随着退火温度的升高,碳钢中铁素体晶粒明显长大,基体软化,屈服强度和抗拉强度降低.退火温度为600℃时,随着保温时间增加,强度没有明显变化.     

铝/铜复合界面金属间化合物

冷轧复合板轧制后要进行一定的热处理以加强界面的结合强度,但同时也带来一定的问题如在界面形成不利于界面结合的化合物.本文对冷轧制备的铝/铜层状双金属片进行了研究,得到了不同退火温度和退火时间下扩散热处理后界面金属间化合物相的生长规律,初步建立了金属间化合物形成的动力学模型.     

铜-铝-铜三层复合板内部涡流场分布研究

利用有限元分析软件ANSYS对新型铜-铝-铜三层复合板内部涡流场进行模拟计算.在铜、铝、铜三层厚度之和一定的条件下，改变复合板的电流加载和其它尺寸，得到同一复合板在不同电流加载情况下的电流密度分布，以及相同电流加载不同铜层厚度时所对应的电流密度分布，同时计算出各种情况下复合板的总阻抗.实验表明：在加载一定的情况下，流经复合板的电流和总体阻抗随着铜覆盖层厚度的增加逐渐减小，增到一定厚度以后，电流和阻抗的变化就很小了；在电压一定的条件下，随着电流频率的增加，铜铝复合板中心线处的电流密度呈变小的趋势；根据仿真得出：复合板阻抗值随电流频率的改变呈线性变化规律，该结论为实现用铜-铝-铜三层复合板取代纯铜及纯铝母线排提供了理论和设计依据.     

影响铜—铝双金属板轧制复合强度工艺因素研究

较系统地研究了铜—铝复合板的轧制复合工艺及其工艺因素对其复合强度的影响,进而探讨了它们的轧制复合机理．     

铜─铝轧制复合工艺研究

研究了铜—铝轧制复合的最佳工艺，并通过轧前组元金属状态、压下率和温度对复合强度的影响，了解了铜—铝复合机理．     

铜—铝轧制复合工艺研究

研究了铜－铝轧制复合的最佳工艺，并通过轧前组元金属状态，压下雍温度对复合强度的影响，了解顾铜－铝复合机理。     

N6/Q235复合板热轧工艺研究

对N6/Q235镍/钢复合板热轧复合工艺采用A、B、C、D四种试验方案进行了研究.其中方案A、C采用的是正常压下,而方案B、D采用的是大压下.试验结果表明,各种方案的加热、轧制均比较顺利,隔离剂涂层厚度选择合适,掀开复合板,复面经喷砂处理后表面质量良好.探伤贴合率达98%以上,贴合良好.各种热轧压下制度轧制的复合板的复层厚度与原设计相同,均控制在标准要求的尺寸范围内.依据对复合板的金相组织、侧断口组织、界面扩散等分析研究,证明获得了组织性能及贴合率均良好的复合板.经过对复合板力学性能各项指标的检验分析,表明所有指标均达到镍-钢复合板标准(YB/T108-97)要求.     

爆炸焊接工艺对铝-钢复合板界面性能的影响

通过不同的爆炸焊接工艺对铝合金-铝-钢进行了爆炸复合，并对爆炸复合后的铝合金-铝-钢复合板的界面组织及力学性能进行了测试分析，探讨了不同爆炸焊接工艺对铝合金-铝-钢复合板界面性能的影响。结果表明：铝合金-铝-钢复合板的铝-钢界面在爆炸复合时界面容易产生一层金属间化合物。随着装药密度的增加，中间层变得愈加连续，界面强度降低明显，而铝-钢界面相互扩散距离变化不明显。     

铜包石墨的铜层厚度对其PTFE基复合材料摩擦学性能的影响

研究了石墨与铜包石墨填料同ＰＴＦＥ聚合物基体的结合状态以及铜层厚度对铜包石墨－ＰＴＦＥ复合材料的布氏硬度及摩擦学性能的影响。结果表明：铜包石墨处理可以显著提高填料与ＰＴＦＥ的界面结合强度;复合材料的布氏硬度随铜层厚度的增加而增大,并逐渐趋于稳定;铜包石墨－ＰＴＦＥ的摩擦系数随铜层厚度的增大而逐渐增大,当铜层厚度大于１．５μｍ时,这种变化逐渐变得缓和,而铜包石墨－ＰＴＦＥ的磨损率随铜层厚度的增加而呈     

铝合金板-混凝土界面粘结-滑移性能双面剪切试验研究

铝合金板具有强度高、耐蚀性及延性好等优点,可用于潮湿、高寒等复杂恶劣环境中混凝土结构的加固,但铝合金板-混凝土的界面性能是影响铝合金板加固混凝土结构效果的关键。进行48个铝合金板-混凝土试件的界面双剪试验,分析铝合金板厚度、铝合金板粘结长度及结构胶种类对界面破坏机理、剥离承载力、粘结剪应力及滑移演化规律的影响。结果表明：增加铝合金板厚度、铝合金板粘结长度以及采用低弹性模量的结构胶能有效提高界面的剥离承载力,但铝合金板粘结长度应控制在有效粘结长度范围内;试件的滑移量随着粘结长度的增加而增大,且铝合金板越厚,试件的滑移量越小。将双直线模型、双曲线模型、Nakaba模型计算结果与试验结果进行对比分析,Nakaba模型与铝合金板-混凝土粘结滑移曲线整体吻合较好。     

Mathematical modeling and simulation of the interface region of a tri-layer composite material, brass-steel-brass, produced by cold rolling

The object of this study was to find the optimum conditions for the production of a sandwich composite from the sheets of brass-steel-brass. The experimental data obtained during the production process were used to validate the simulation program, which was written to establish the relation between the interface morphology and the thickness reduction amount of the composite. For this purpose, two surfaces of a steel sheet were first prepared by scratching brushing before inserting it between two brass sheets with smooth surfaces. Three sheets were then subjected to a cold rolling process for producing a tri-layer composite with various thick-nesses. The sheet interface after rolling was studied by different techniques, and the bonding strength for each rolling condition was determined by peeling test. Moreover, a relation between interfacial bonding strength and thickness reduction was found. The simu-lation results were compared with the experimental data and the available theoretical models to modify the original simulation pro-gram with high application efficiency used for predicting the behavior of the interface under different pressures.     

不锈钢复铝板结合强度和延伸率的实验研究

实验研究了N2 气保护下加热轧制复合和辊板轧制工艺对不锈钢和铝复合板材界面结合强度及复合板深加工性能的影响。结果表明 ,N2 气保护下加热轧制复合和辊板轧制可有效提高复合板界面结合强度 ,同时使达到界面良好结合的临界变形率明显降低 ;这两种轧制工艺不仅在小变形的条件下即可实现不锈钢和铝复合界面的良好结合 ,而且能明显降低复合过程中不锈钢的变形率分配 ,有利于改善复合板的深加工性能     

铝合金板与混凝土的粘贴粘结强度研究

为了在提高加固钢筋混凝土梁承载力的同时具有很好的延性和耗能能力,特别是满足侵蚀环境及寒冷环境中加固工程的需要,采用铝合金板加固钢筋混凝土梁是一个很好的解决办法。铝合金板通过粘贴层将力传给钢筋混凝土梁,故铝合金板与混凝土的粘贴粘结性能决定了铝合金板加固钢筋混凝土梁的效果。铝合金板与混凝土的粘贴粘结强度作为铝合金板加固钢筋混凝土梁连接设计的基础,对其开展试验和理论研究。开展105个试件的铝合金板与混凝土面内单剪试验发现：对粘贴界面没有进行粗糙处理的试件发生了界面剥离破坏,其他试件均发生了混凝土层剥离破坏;界面剥离破坏的粘结性能远差于混凝土层剥离破坏,说明了对粘贴界面进行处理的必要性。通过试验得到铝合金板和混凝土连接的极限粘结荷载,根据铝合金板正应力的变化率与粘贴界面剪应力的关系,得到剪应力的分布曲线和有效粘结长度;假设剪应力沿有效粘结长度处处相等,得到了铝合金板与混凝土的粘贴试验粘结强度,并基于此讨论了界面处理、混凝土强度、铝合金板宽度、厚度和粘贴长度等因素对试验粘结强度的影响。结合试验数据的统计回归分析,提出计算铝合金板与混凝土的粘贴粘结强度的修正Niedermeier模型,得到了铝合金板与混凝土的有效粘结长度和粘贴粘结强度的理论计算公式,其理论值和试验值吻合较好,误差最大值为8.98%,平均值为0.004,标准差为0.041。研究成果为铝合金板加固钢筋混凝土梁的粘贴设计提供了理论基础。     

Thickness of compound layer in steel-aluminum solid to liquid bonding

The bonding of solid steel plate to liquid aluminum was studied using rapid solidification. The surface of solid steel plate was defatted, descaled, immersed (in K2ZrF6 flux aqueous solution) and stoved. In order to determine the thickness of Fe-AI compound layer at the interface of steel-aluminum solid to liquid bonding under rapid solidification, the interface of bonding plate was investigated by SEM (Scanning Electron Microscope) experiment. The relationship between bonding parameters (such as preheat temperature of steel plate, temperature of aluminum liquid and bonding time) and thickness of Fe-AI compound layer at the interface was established by artificial neural networks (ANN) perfectly. The maximum of relative error between the output and the desired output of the ANN is only 5.4%. From the bonding parameters for the largest interfacial shear strength of bonding plate (226℃for preheat temperature of steel plate, 723℃ for temperature of aluminum liquid and 15.8 s for bonding time), the reasona     

铝合金板混凝土界面的粘结滑移性能及其本构关系

铝合金板具有轻质高强、耐腐蚀性和延展性好等优点,是复杂恶劣环境中加固混凝土结构的理想材料。基于双剪试验进行铝合金混凝土界面粘结滑移性能研究,完成了45个构件的双面纯剪试验,得到了其破坏形态、荷载应变关系曲线、粘结界面剪应力分布曲线、荷载滑移关系曲线以及界面极限承载力,分析了不同的混凝土强度等级、铝合金板表面粗糙度、铝合金板粘结长度和粘结宽度条件下界面粘结滑移性能的演化规律。研究表明：加载过程中,界面应力从加载端向自由端逐步传递,且随着混凝土强度等级、铝合金板的粘结长度和宽度的增加,试件的剥离承载力也有所提高。但铝合金的粘结长度存在一个有效粘结长度值,超过该值试件的剥离承载力将不再增加,同时,铝合金表面粗糙度对试件剥离承载力的提高没有实质影响。通过测量铝合金板的应变得到了不同参数条件下铝合金板混凝土粘结滑移本构曲线,结果表明：铝合金板混凝土粘结滑移本构曲线存在明显的界面软化特征和非线性行为。     

Deformation characteristic of aluminum sheet/powders/aluminum sheet sandwich rolling process

Using high aluminum refractory material as substrate at 1 400 ~C, we studied the connections between several oxides such as Fe203, MnO2, CuO, and the formation of defects such as coating crack, exfoliation, blistering, erosion, and fading away appeared in the application of high temperature infrared radiation coating. Analyses showed that thermal stress formed during the heating process due to the thermal expansion coefficient differential between the coating and the substrate, and volume effect caused by the crystal transferred when the temperature changed, which resulted in the coating crack and exfoliation. The gas produced by the reactions between components and binder or the components themselves during the heating process caused the coating blistering. The EMPA and XRD analyses show that oxides with low melting point in the penetrating area of the substrate may form eutectic with low melting point and produced thermal defects, which leads to the erosion by penetrating to the substrate. The valent changes of Fe203 and MnO2 during the heating process cause the volatilization of the oxides or the pulverization of the coatings, resulting in the coating fades away easily at high temperature for a long time.     

Multilayer Clad Plate of Stainless Steel/Aluminum/Aluminum Alloy

The 3, 5, 20 layer clad plate from austenitic stainless steel, pure aluminum and aluminum alloy sheets were fabricated in different ways. The stretch and interface properties were measured. The result shows that 20 layer clad plate is better than the others. Well-bonded clad plate was successfully obtained in the following procedure: Basic clad sheet from 18 layer Al1060/Al3003 sheets was firstly obtained with an initial rolling reduction of 44% at 450 ℃, followed by annealing at 300 ℃, and then with reduction of 50% at 550 ℃ from STS304 on each side. The best 20 layer clad plate was of 129 MPa bonding strength and 225 MPa stretch strength.     

EVALUATION OF LUBRICANTS FOR COLD ROLLING ALUMINUM STRIPS

Rollingprocessisconsideredasatribologicalsystemmadeupofrolls,workpieceandinbricant,andthereforethelubricanthasgreatinfluencesontherollingforceparametersandthesurfacequalitiesofrolledaluminumsheetsandstrips["'j.Withthedevelopmentofrollingtechnologyandadecreaseinrollingoilviscosity,lubricationmodelshavebeentransformedfromhydrodynamiclubricationintomixedlubricationorboundarylubrication.Currently,thelightmineraloilsuesdasthebaseoilsareplayinganimportantroleinlubricationforcoldrollingaluminumandits…