铝电解电容器技术的新进展

详细讨论了电子技术的发展对铝电解电容器的性能要求,提出了其技术对策,分析了存在的技术瓶颈,找出了它的技术出路,探讨了它的技术难点,给出了当前我国铝电解电容器行业的技术现状,指出了未来发展方向。     

Producing deep UV-LEDs in high-yield MOVPE by improving AlN crystal quality with sputtered AlN nucleation layer

High-quality AlN layers with low-density threading dislocations are indispensable for high-efficiency deep ultraviolet light-emitting diodes (UV-LEDs). In this work, a high-temperature AlN epitaxial layer was grown on sputtered AlN layer (used as nucleation layer, SNL) by a high-yield industrial metalorganic vapor phase epitaxy (MOVPE). The full width half maximum (FWHM) of the rocking curve shows that the AlN epitaxial layer with SNL has good crystal quality. Furthermore, the relationships between the thickness of SNL and the FWHM values of (002) and (102) peaks were also studied. Finally, utilizing an SNL to enhance the quality of the epitaxial layer, deep UV-LEDs at 282 nm were successfully realized on sapphire substrate by the high-yield industrial MOVPE. The light-output power (LOP) of a deep UV-LED reaches 1.65 mW at 20 mA with external quantum efficiency of 1.87%. In addition, the saturation LOP of the deep UV-LED is 4.31 mW at an injection current of 60 mA. Hence, our studies supply a possible process to grow commercial deep UV-LEDs in high throughput industrial MOVPE, which can increase yield, at lower cost.     

Multifunctional Electrode Design Consisting of 3D Porous Separator Modulated with Patterned Anode for High‐Performance Dual‐Ion Batteries

Searching for low‐cost and high‐capacity electrode materials such as metal anodes is of important significance for the development of new generation rechargeable batteries. However, metal anodes always suffer from severe volume expansion/contraction during a repeated electrochemical alloying/dealloying process. In this study, a novel concept about modifying metal‐anodes‐based battery construction with a multifunctional electrode (ME) design is provided. The ME consists of a 3D porous separator that is modulated with a patterned aluminum anode, which simultaneously works as a current collector, anode material, and separator in a dual‐ion battery (DIB). The 3D porous separator not only enables the ME to possess significantly improved electrolyte uptake and retention capabilities, but also acts as a protecting layer to restrict the surface pulverization of the Al anode. The ME‐DIB displays remarkably enhanced cell performances, including excellent cycling stability with 92.4% capacity retention after 1000 cycles at a current density of 2 C, and superior rate performance with 80.7% capacity retention at 10 C.     

高压电极铝箔腐蚀孔洞模型的探讨

利用SEM、TEM观测了高压腐蚀铝箔表面和横截面的形貌,介绍了3种高压电极铝箔的腐蚀孔洞模型:圆孔、方孔、条状凹槽;通过对当前市场上国内、日本的高压高比容电极箔腐蚀孔洞的实际形貌特征进行对比分析,发现:具有实际意义的理想腐蚀孔洞应当具有介于条状凹槽和圆孔之间的形状;通过改进电蚀技术来提高高压电子铝箔的比电容还有相当大的空间;在电蚀过程中抑制簇状并孔发生并促进线状并孔发生以使得腐蚀孔洞呈现条状沟槽形状是今后高压电极箔制造技术的改进与发展方向之一。     

引线式400V缩体铝电解电容器电解纸选用研究

为满足铝电解电容器的缩体要求,对比研究了使用6种电解纸制作引线式缩体105℃400V68μm铝电解电容器(φ18 mm×25 mm)时的电容器芯包外径、芯包短路、芯组浸渍、一次老化合格情况以及电解纸对电容器电参数和可靠性的影响。结果表明,使用总厚度为60μm的W165-40和W180-20电解纸,并调整浸渍工艺,可使产品具有良好的性价比。     

铝合金连续-脉冲激光焊接工艺对比实验研究

为了研究5052铝合金激光焊接工艺,采用脉冲激光和连续激光分别对1.5mm厚的5052铝合金板进行了焊接,并对工艺参量进行了优化。通过对两种不同类型激光焊接试样的焊缝形貌的对比、微观组织的分析、抗拉强度和显微硬度测试,可知脉冲激光焊接对焊接接头气孔的控制更为理想,使得脉冲激光焊接所获得的焊接质量更加优异,与连续激光焊接相比,其接头的抗拉强度增加了10%。结果表明,脉冲激光焊接和连续激光焊接均可以使焊接试样得到较为理想的焊缝形貌和较高的抗拉强度。     

铝合金的大功率扩散型CO2激光粉末焊接技术

本试验研究采用２６００Ｗ扩散型（Ｓｌａｂ）ＣＯ２激光加工系统,利用喷射填充粉末激光焊接技术成功地进行了铝合金焊接;确定了试验材料激光焊接的能量阈值;通过工艺参数的优选获得了无明显焊接缺陷、正反两表面平滑连续的焊缝;焊接接头的力学性能检测表明,ＡＡ６０１６铝合金（厚度为１．１５ｍｍ）焊接接头抗拉强度不低于母材的可允许间隙可达０．５ｍｍ（母材厚度物４４％）;根据试验结果,推荐对于一定板厚的铝合金,应该     

NH4Cl对机械活化Al粉燃烧合成AlN的控制

添加NH4Cl到经由高能球磨制得的机械活化铝粉中后,铝粉在空气中于室温下即可发生自燃反应.本研究通过含有不同量NH4Cl的机械活化铝粉的自燃制得了Al2O3-AlN疏松粉末,并研究了NH4CL添加量对燃烧产物成分和结构的控制.结果表明:NH4Cl不仅控制了产物的形貌,而且改变了铝粉的氮化初理.在NH4Cl添加量为3%～...     

(Al2O3)f/Al复合材料疲劳损伤模式的SEM研究

通过扫描电子显微镜(SEM)对(Al2O3)f／Al复合材料的疲劳断口和纵截面组织结构进行了观察，研究了复合材料的疲劳损伤模式。研究结果表明：该复合材料兼有钛基和树脂基纤维复合材料疲劳损伤的特点，高应力下由单个裂纹的起源和生长导致复合材料的失效；低应力下，疲劳损伤模式包括纤维劈裂、众多基体裂纹和单个基体裂纹的横向扩展，其中纤维劈裂是主控机制。其更高的疲劳极限可归因于低应力下纤维的纵向劈裂。     

Engineering a Nanoscale Al‐MOF‐Armored Antigen Carried by a “Trojan Horse”‐Like Platform for Oral Vaccination to Induce Potent and Long‐Lasting Immunity

Vaccination via the oral administration of an antigen faces many challenges, including gastrointestinal (GI) proteolysis and mucosal barriers. To limit GI proteolysis, a biomimetically mineralized aluminum‐based metal–organic framework (Al‐MOF) system that is resistant to ambient temperature and pH and can act synergistically as a delivery vehicle and an adjuvant is synthesized over a model antigen ovalbumin (OVA) to act as armor. To overcome mucosal barriers, a yeast‐derived capsule is used to carry the Al‐MOF‐armored OVA as a “Trojan Horse”‐like transport platform. In vitro experiments reveal that the mineralization of Al‐MOFs forms an armor on OVA that protects against highly acidic and degradative GI conditions. However, the mineralized Al‐MOFs can gradually disintegrate in a phosphate ion‐containing simulated intracellular fluid, slowly releasing their encapsulated OVA. In vivo studies reveal that the “Trojan Horse”‐like transport platform specifically targets intestinal M cells, favoring the transepithelial transport of the Al‐MOF‐armored OVA, followed by subsequent endocytosis in local macrophages, ultimately accumulating in mesenteric lymph nodes, yielding long‐lasting, high‐levels of mucosal S‐IgA and serum IgG antibodies. Such an engineered delivery platform may represent a promising strategy for the oral administration of prophylactic or therapeutic antigens for vaccination.