抗粘连剂在CPP镀铝膜上的应用研究

研究了有机微珠、玻璃微珠、合成硅石三种助剂制备的抗粘连母料在CPP镀铝膜生产中的应用。对抗粘连剂在CPP镀铝基材膜的分散性和对摩擦系数、雾度、耐磨性及镀铝层附着力等性能影响进行了对比试验分析,结果表明:使用有机抗粘连剂的CPP镀铝基材膜的雾度较低,CPP镀铝膜的镀铝层附着力较好。     

有机涂层表面真空镀铝的研究

在有机涂层表面真空蒸发镀铝的蒸镀过程中,有机涂层内有机挥发物质及水分的挥发放气,影响真空蒸发镀铝过程和蒸镀铝膜的质量。在分析真空镀铝过程的热力学与动力学的基础上,重点研究了在塑料膜和纸的卷材上有机涂层表面蒸镀铝膜的质量与成膜条件及沉积速率对铝膜反射率的影响。研究结果对具有有机涂层的各种材料表面的真空镀膜,均有参考价值。     

抗粘连剂在CPP镀铝膜上的应用研究简

研究了有机微珠、玻璃微珠、合成硅石三种助剂制备的抗粘连母料在CPP镀铝膜生产中的应用。对抗粘连剂在CPP镀铝基材膜的分散性和对摩擦系数、雾度、耐磨性及镀铝层附着力等性能影响进行了对比试验分析,结果表明：使用有机抗粘连剂的CPP镀铝基材膜的雾度较低,CPP镀铝膜的镀铝层附着力较好。     

射频磁控溅射对PET基材制备铝薄膜的性能影响

针对传统制铝技术,为提高膜层结合力、阻隔性,采用射频磁控溅射镀铝工艺,制备纯铝高阻隔性膜层,在PET塑料薄膜表面沉积纯铝的实验.通过对射频电源功率和溅射气压等参数的改变,探究射频功率、溅射气压对薄膜结合力、阻隔性的影响.结果表明:薄膜沉积过程中的射频功率和溅射气压对磁控镀铝薄膜性能影响较大,在一定的溅射压力下,膜层的结...     

复合膜铝层转移现象分析

影响铝转移的因素主要为镀铝基膜本身的粘结强度、胶粘剂的渗透破坏及界面层产生内应力3方面,从镀铝膜基膜、胶黏剂、张力控制及熟化等几个方面,对镀铝膜在复合过程中发生铝层转移现象进行理论分析,为复合软包装的生产厂家提供参考。     

老化环境对T800碳纤维/环氧树脂基复合材料性能的影响

不同老化环境(湿热、热水、热氧)对复合材料的性能有着重要的影响。文中分析了同一温度不同老化环境下T800碳纤维/环氧树脂基复合材料的吸湿(湿热、热水)和失重(热氧)特性,并对比了老化前后的表面形貌、物理化学特性、动态力学性能及层间剪切性能。结果表明,在相同温度下,热氧环境下的失重率要大于湿热和热水环境下的吸湿率;随着老化时间延长,热氧环境下材料表面形貌变化相比湿热和热水环境变化较大;在70℃不同老化环境下,热氧环境下材料的玻璃化转变温度变化值要大于湿热和热水环境下的玻璃化转变温度变化值,说明热氧对T800碳纤维/环氧树脂基复合材料基体的后固化作用大于吸湿对树脂基体的塑化作用,但材料化学官能团没有明显变化。与未老化相比,试样的最大破坏载荷和剪切强度在湿热和热水环境下降低,在热氧环境下升高,但差值不大。研究对T800碳纤维/环氧树脂基复合材料结构件在更复杂环境下的使用和贮存具有重要的工程实际意义。     

真空镀铝膜局部开窗技术

真空镀铝膜局部“开窗”是基膜镀铝后,在通体不透明的基膜上根据设计要求,在膜的设定部位以设定的文字图案形式剔除该处的镀铝层,从而显现出透明的文字图案效果。用局部“开窗”镀铝膜与可热封合材料制成的局部透明镀铝包装袋,不仅具有华丽的装饰效果和阻隔、促销作用,更具独特的防伪功能,因此具有推广价值。     

支链含氟聚酯的合成和性能

用1H,1H,2H,2H-全氟-1-癸醇对1,2,4-苯三酸酐中的一个官能团进行封端后替代部分顺丁烯二酸酐，与新戊二醇共缩聚合成了支链含氟聚酯，然后在含氟聚酯中加入交联剂进行固化反应制备出支链含氟聚酯膜。使用红外光谱、XRD、GPC、TG和DSC等手段表征含氟聚酯的结构、分子量和热稳定性，用万能试验机、接触角测试仪和X射线电子能谱分析了含氟聚酯膜的力学性能、表面性能及表面元素含量。结果表明，在聚酯中成功引入含氟基团使含氟聚酯比无氟聚酯的分子量增大，热稳定性先提高后降低，初始分解温度最高达299.41℃，玻璃化转变温度由6.24℃提高到46.65℃；随着含氟基团含量的提高聚酯膜的断裂伸长率降低而拉伸强度提高，拉伸强度最高达到19.97 MPa；含氟基团由含氟聚酯膜的本体向表面迁移，随着含氟基团含量的提高聚酯膜的水接触角和油接触角逐渐增大，使聚酯膜具有疏水性。     

真空镀铝膜局部“开窗”技术

真空镀铝膜局部“开窗”是基膜镀铝后，在通体不透明的基膜上根据设计要求，在膜的设定部位以设定的文字图案形式剔除该处的镀铝层，从而显现出透明的文字图案效果。用局部开窗镀铝膜与可热封合材料制成的局部透明镀铝包装袋不仅具有阻隔和华丽的装饰效果，同时具有独特的防伪功能，并在一定程度上起到促销作用，因此值得推广。     

PSTM中不同探针扫描成像的模拟分析

金属纳米粒子或薄膜在可见光的激励下产生表面增强效应。尝试在光子扫描隧道显微镜(PSTM)中应用带铝的光纤探针来提高成像的分辨率和灵敏度。采用二维时域有限差分法(FDTD)模拟计算了裸光纤、尖端镀铝颗粒光纤、孔径镀铝膜光纤和全镀铝膜光纤探针的成像。结果显示,采用带铝探针后的灵敏度均比裸光纤提高两个数量级;尖端镀铝颗粒光纤探针的分辨率最好,可优于20nm;全镀铝膜和孔径镀铝膜光纤探针的分辨率分别可达到20nm和60nm。结果可供探针制备及实验参数设置参考。     

5083铝合金整体壁板耐腐蚀性能研究

铝合金整体壁板具有质量轻、耐腐蚀等特点,在国外已广泛应用在船舶建造上。本文研究了5083铝合金整体壁板的抗剥落腐蚀和应力腐蚀性能,对其耐腐蚀性能和机理进行了深入的探讨。结果表明,在铝合金整体壁板组织中β相沿加工方向成行,不连续分布,未在晶界上出现连续的β相网膜结构,因此整体壁板具有良好的耐腐蚀性能。     

航空用7475-T7351铝合金厚板耐腐蚀性能

研究航空用7475-T7351铝合金厚板晶间腐蚀及剥落腐蚀性能,并利用金相和透射电镜分析该合金的腐蚀行为。结果表明:7475铝合金无明显晶间腐蚀,剥落腐蚀程度由表层的EA级递增至心部EC级。7475铝合金厚板发生剥落腐蚀主要是由于合金为片状组织,同时晶界存在由电偶腐蚀构成的通路,晶界腐蚀产物体积膨胀产生楔入力使晶间腐蚀沿着与表面平行的方向发展并逐步演变为剥落腐蚀。再结晶程度由表层到中心逐渐降低,晶粒长宽比增加,剥落腐蚀倾向增大,导致表层到心部的剥落腐蚀程度增加。     

Effect of creep-aging processing on corrosion resistance of an Al–Zn–Mg–Cu alloy

Creep-aging forming, combining both the aging treatment and forming process, has recently drawn much attention of researchers. In this study, the effects of creep-aging processing on the corrosion resistance of an Al–Zn–Mg–Cu alloy are studied. Results show that the corrosion resistance of the studied Al–Zn–Mg–Cu alloy is sensitive to creep-aging processing parameters (creep-aging temperature and applied stress). With the increase of creep-aging temperature, the corrosion resistance first increases and then decreases. Increasing the applied stress can deteriorate the electrochemical corrosion resistance and improve the exfoliation corrosion resistance. The creep-aging processing can change the size and distribution of precipitates in the aluminum matrix, which significantly affects the corrosion resistance. The discontinuous grain boundary precipitates and narrow precipitate-free zones can enhance the corrosion resistance.     

蠕变时效对7050铝合金板材组织与性能的影响

通过金相显微、透射电子显微、电子拉伸和剥落腐蚀实验研究了7050铝合金板材蠕变时效与人工时效的微结构及性能。结果表明:蠕变时效过程中施加的应力使板材不断产生变形,为η′析出相提供了大量形核点,析出相尺寸更加细小,特别是晶界无沉淀带较人工时效明显变窄,晶界析出相不连续。与人工时效相比,蠕变时效试样的抗拉强度和抗剥落腐蚀性能略有提高。     

Ultrafast Laser‐Shock‐Induced Confined Metaphase Transformation for Direct Writing of Black Phosphorus Thin Films

Few‐layer black phosphorus (BP) has emerged as one of the most promising candidates for post‐silicon electronic materials due to its outstanding electrical and optical properties. However, lack of large‐scale BP thin films is still a major roadblock to further applications. The most widely used methods for obtaining BP thin films are mechanical exfoliation and liquid exfoliation. Herein, a method of directly synthesizing continuous BP thin films with the capability of patterning arbitrary shapes by employing ultrafast laser writing with confinement is reported. The physical mechanism of confined laser metaphase transformation is understood by molecular dynamics simulation. Ultrafast laser ablation of BP layer under confinement can induce transient nonequilibrium high‐temperature and high‐pressure conditions for a few picoseconds. Under optimized laser intensity, this process induces a metaphase transformation to form a crystalline BP thin film on the substrate. Raman spectroscopy, atomic force microscopy, and transmission electron microscopy techniques are utilized to characterize the morphology of the resulting BP thin films. Field‐effect transistors are fabricated on the BP films to study their electrical properties. This unique approach offers a general methodology to mass produce large‐scale patterned BP films with a one‐step manufacturing process that has the potential to be applied to other 2D materials.     

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

High temperature oxidation and hot corrosion properties of Ir–Ta coated and aluminized Ni-base superalloys are presented. An Ir–Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir–Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir–Ta enriched layer. These results indicated that the Ir–Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials.     

铝锌合金在镁合金AZ91D中的扩渗机理及腐蚀性能研究

采用包埋铝和锌的方法在镁合金AZ91D表面制备了铝-锌合金化涂层,并且利用x射线衍射、能谱分析研究了该涂层的组织和耐腐蚀性能。该涂层外层为AlMg2Zn, Mg7Zn3 和Mg17Al12 金属间化合物层;内层为Mg17Al12金属间化合物分布于α-Mg晶界。研究表明,与镁合金基体相比较在质量分数为3.5wt.% NaCl扩渗层显示出较好的耐腐蚀性能。盐雾腐蚀说明,Al-Mg-Zn合金化扩渗层对于降低腐蚀速率起到有效作用。此外,合金化扩渗层与基体的结合是冶金结合,且涂层的显微硬度显著提高。     

Fine structures in Fe3Al alloy layer of a new hot dip aluminized steel

The fine structure in the Fe-Al alloy layer of a new hot dip aluminized steel (HDA) was examined by means of X-ray diffractometry (XRD), electron diffraction technique, etc. The test results indicated that the Fe-Al alloy layer of the new aluminized steel mainly composed of Fe₃Al, FeAl and α-Fe (Al) solid solution. There was no brittle phase containing higher aluminum content, such as FeAl₃ (59.18% Al) and Fe2Al7 (62–93% Al). The tiny cracks and embrittlement, formerly caused by these brittle phases in the conventional aluminum-coated steel, were effectively eliminated. There was no microscopic defect (such as tiny cracks, pores or loose layer) in the coating. This is favourable to resist high temperature oxidation and corrosion of the aluminized steel.     

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

High temperature oxidation and hot corrosion properties of Ir–Ta coated and aluminized Ni-base superalloys are presented. An Ir–Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir–Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir–Ta enriched layer. These results indicated that the Ir–Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials.     

阳离子染料可染共聚酯的结构及性能

采用动态力学分析法(DMA)、热重法(TGA)及X射线衍射法对常规PET、CDP及醚型ECDP的结构及性能进行了研究。结果表明,CDP的Tg高于PET,但其Tα′及Tm均低于PET。ECDP的Tg、Tα′及Tm均低于PET和CDP,并且随PEG含量及分子量的增加而降低;热解活化能(ΔEd)随着SIPE与PEG含量的增加而降低,即热稳定性降低;另外,与常规PET相比,CDP及ECDP的衍射峰位置基本没有改变,改性共聚酯的组分并未砌入晶格,而是存在于无定型区。