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1.
压电式喷墨印刷中液滴喷射参数分析   总被引:4,自引:4,他引:0  
宋波  唐正宁 《包装工程》2011,32(19):93-96
油墨液滴体积大小是影响喷墨成像质量的直接因素,对喷墨印刷中液体喷射情况进行了分析与研究。以一套压电式喷液设备,进行了乙二醇液体的液滴喷射实验,观察并探讨了操作频率、脉冲时间、脉冲电压、脉冲形态等实验参数对液滴喷射过程的影响。实验表明:改变不同的参数会影响到液滴的形成机制,分别对每个参数进行观测,以求找到液滴喷射的最佳条件。  相似文献   

2.
喷射成形技术及应用   总被引:2,自引:1,他引:1  
简要介绍了喷射成形技术的原理、特点,讨论了近几年来喷射成形技术在不锈钢、铸铁、铝合金、高温合金等材料中的应用与发展趋势。  相似文献   

3.
金属均匀液滴束流技术的应用   总被引:4,自引:0,他引:4  
简述了均匀液滴束流技术的发展与应用,讨论了均匀液滴束流产生机理及熔融金属射流的破碎.金属均匀液滴束流可应用于粉末冶金、材料合金薄层涂敷、电路封装和金属零件的快速成形等,具有广阔的市场应用前景.  相似文献   

4.
介绍了喷射成形技术在超高强铝合金、高比强度和高比模量铝合金、高硅铝合金、低膨胀和耐磨铝合金、耐热铝合金、颗粒增强铝基复合材料制备上的应用.与传统工艺(普通粉末冶金、铸造)相比,喷射成形技术在铝合金的制备上体现了很大的优越性和开发潜力.  相似文献   

5.
喷射成形技术产品的研究现状   总被引:2,自引:1,他引:1  
喷射成形是一种快速凝固近终成形材料制坯技术,利用该技术制备的材料具有优异的性能,喷射成形技术产品在特定的领域中正在逐步取代一些传统材料,简要阐述了喷射成形技术和产品的研究发展现状。  相似文献   

6.
7.
喷射成形技术及其在钢铁材料上的应用   总被引:1,自引:0,他引:1  
喷射成形是近年来发展非常迅速的一种近终成形先进冶金工艺技术。与传统铸造工艺及粉末冶金工艺相比,喷射成形设备、工艺简单,能生产偏析小、晶粒细、致密度高的材料。喷射成形技术在铝基合金、铁基合金、高温合金、铜合金及复合材料等方面都得到了广泛的应用。主要介绍该技术的原理及其在钢铁材料方面的应用情况,并讨论了它在钢铁领域的发展趋势,指出喷射成形工艺是一种有望替代粉末冶金工艺生产高合金钢材及一些特殊钢材的崭新工艺。  相似文献   

8.
脉冲微孔喷射法能够制备尺寸均一且热历史一致的单分散球形液滴及凝固粒子,在凝固理论研究、微电子封装、金属三维打印及粉末冶金等领域具有明显的优势。本文从脉冲微孔喷射法(POEM)的实验原理、装置以及模拟计算成果出发,综述了基于POEM所制备的未达到冷却凝固状态的微液滴在凸点沉积、3D打印、逐液滴雾化等方面的应用,以及基于POEM所制备的达到冷却凝固状态的微粒子在电子封装、核壳结构、金属玻璃等方面的应用,并进一步对现阶段脉冲微孔喷射法应用存在的问题以及发展前景进行了说明和展望。本综述可为单分散球形微滴及凝固微粒子相关领域以及凝固研究理论提供进一步的参考。  相似文献   

9.
喷射成形技术及应用开发研究   总被引:2,自引:0,他引:2  
喷射成形技术是一种快速凝固近终成形材料制备新技术,其最突出的创新点在于,把液态金属的雾化(快速凝固)和雾化熔滴的沉积(熔滴动态致密固化)自然地结合起来,在一步冶金操作中完成,以最少的工序,直接从液态金属制取具有快速凝固组织、整体致密、接近零件实际形状的高性能材料或半成品坯件。利用这项技术,不仅可以制备出许多高性能的新材料,而且可以大幅度提高传统材料的性能,同时又不明显地增加材料的制备成本,容易获得较高的产量,因此,喷射成形技术对于冶金材料制备行业来讲,有着广泛的适应性,是标志着材料制备技术更新换代的一种新型技术手段,在国际上,与半固态加工、薄板坯铸轧  相似文献   

10.
《新材料产业》2006,(11):14-15
提高汽车发动机中的各种关键零部件的使用性能、降低其重量和制造成本是提高发动机综合性能、降低发动机直至整车重量和制造成本的关键。在发动机缸体和活塞等部件纷纷成功采用轻质铝合金以后,缸套轻量化已经成为限制发动机性能提高和新型发动机设计制造的“瓶颈”。近年来,喷射成形发动机用铝合金缸套的开发及应用,为上述问题的最终解决开辟了一条切实可行的新途径。通过多年努力,我们已经完全掌握了喷射成形技术,并且过了中试阶段。  相似文献   

11.
A high performance, multinozzle, piezoelectric drop-on-demand ink-jet printer was used for solid freeforming of ceramics by direct, multiple-layer printing of suspensions of a commercially available powder. The wide-array print head was arranged over a single-axis stepper-motor driven table. Ceramic inks were prepared using low-polarity solvents to give low-ink conductivity and, hence, prevent corrosion of the electroding system in the print head. Zirconia inks were prepared in a high-energy bead mill charged with 500 m diameter zirconia media. The procedure for selecting solvent, dispersant, resin and their proportions is discussed in the context of print quality. The surface quality and fracture surfaces of three-dimensional (3-D) sintered zirconia test coupons were studied by microscopy. The fracture surfaces showed no sign of droplet relics and could not be used to detect the method of powder assembly.  相似文献   

12.
一类并联机床整机结构动力学建模方法研究   总被引:2,自引:0,他引:2  
研究了一种外副驱动的3平动自由度并联机床整机结构动力学建模方法。该方法借助子结构综合思想,将整机结构划分为机架、连杆和动平台三个子结构,用有限元法分别构造各自的动力学方程,再利用变形协调条件得到考虑机架弹性的整机动力学模型。该方法可避免采用商用有限元软件必须针对不同位形重新划分网格的局限性,便于揭示结构参数对低阶模态的影响及其在整个工作空间内的变化规律,故为这类机构一结构耦合复杂时变系统的动刚度快速预估和动态设计奠定了坚实的理论基础。  相似文献   

13.
生物芯片是受到国内外普遍重视的新技术,借助于微制造技术研究成果,近年来发展非常迅速。讨论了目前生物芯片所采用的微制造技术的特点、存在的问题和发展前景,对生物芯片的发展具有积极的现实意义。  相似文献   

14.
    
The high throughput deposition of microscale objects with precise spatial arrangement represents a key step in microfabrication technology. This can be done by creating physical boundaries to guide the deposition process or using printing technologies; in both approaches, these microscale objects cannot be further modified after they are formed. The utilization of dynamic acoustic fields offers a novel approach to facilitate real-time reconfigurable miniaturized systems in a contactless manner, which can potentially be used in physics, chemistry, biology, as well as materials science. Here, the physical interactions of microscale objects in an acoustic pressure field are discussed and how to fabricate different acoustic trapping devices and how to tune the spatial arrangement of the microscale objects are explained. Moreover, different approaches that can dynamically modulate microscale objects in acoustic fields are presented, and the potential applications of the microarrays in biomedical engineering, chemical/biochemical sensing, and materials science are highlighted alongside a discussion of future research challenges.  相似文献   

15.
16.
汪扬  宋志棠  章宁琳  林成鲁 《功能材料》2003,34(3):242-243,246
光子晶体及其在光电子领域的应用是目前国际上的研究热点之一,是一种新型的光电子功能材料。在近红外光通讯领域中,光子晶体(对应允子晶体晶格常数为亚微米)有非常重要的应用,可以制作许多以前所不能制作的高性能光学器件。如何制备用于光通讯领域的光子晶体越来越引起广泛关注。本文综述了近红外波段光子晶体的微细加工制备方法的研究进展。  相似文献   

17.
    
3D hydrogel microstructures that encapsulate cells have been used in broad applications in microscale tissue engineering, personalized drug screening, and regenerative medicine. Recent technological advances in microstructure assembly, such as bioprinting, magnetic assembly, microfluidics, and acoustics, have enabled the construction of designed 3D tissue structures with spatially organized cells in vitro. However, a bottleneck exists that still hampers the application of microtissue structures, due to a lack of techniques that combined high‐throughput fabrication and flexible assembly. Here, a versatile method for fabricating customized microstructures and reorganizing building blocks composed of functional components into a combined single geometric shape is demonstrated. The arbitrary microstructures are dynamically synthesized in a microfluidic device and then transferred to an optically induced electrokinetics chip for manipulation and assembly. Moreover, building blocks containing different cells can be arranged into a desired geometry with specific shape and size, which can be used for microscale tissue engineering.  相似文献   

18.
双光子三维微细加工的进展   总被引:1,自引:0,他引:1  
介绍了双光子微细加工的原理及特点,总结了国内外在三维微结构、三维功能器件以及新型材料双光子微细加工的一些进展.同时介绍了作者在双光子三维微细加工研究中取得的一些研究结果.  相似文献   

19.
    
Nowadays, personalized medical implants are frequently produced through additive manufacturing. As all medical devices have to undergo specific washing and sterilization before application, the effects of a predefined cleaning routine that is available to the clinical institutes, washing with chemical agent and formaldehyde fumigation, on the mechanical behavior of printed parts are examined. Mechanical properties of parts manufactured by fused filament fabrication (FFF) and ARBURG plastic freeforming (APF) using two poly(methyl methacrylate) (PMMA)-based materials, 3Diakon and CYROLITE MD H12, respectively, are analyzed using flexural and impact tests. An influence of cleaning treatments on the mechanical properties of APF samples is not detected. FFF samples, however, show lower impact strength after washing, but not after sterilization. The fracture surfaces, porosity values, or chemical structure assessed by Fourier-transform infrared (FTIR) spectroscopy could not explain this decrease. Influence of the cleaning treatments on the material itself is assessed using thin compression-molded specimens. The influence on the stress–strain curves is negligible, apart from a slight but significant reduction in the yield stress. FTIR spectroscopy and scanning electron microscopy analyses of the fracture surfaces do not show detectable differences among differentially treated samples.  相似文献   

20.
    
When designing a new nanostructure or microstructure, one can follow a processing‐based manufacturing pathway, in which the structure properties are defined based on the processing capabilities of the fabrication method at hand. Alternatively, a performance‐based pathway can be followed, where the envisioned performance is first defined, and then suitable fabrication methods are sought. To support the latter pathway, fabrication methods are here reviewed based on the geometric and material complexity, resolution, total size, geometric and material diversity, and throughput they can achieve, independently from processing capabilities. Ten groups of fabrication methods are identified and compared in terms of these seven moderators. The highest resolution is obtained with electron beam lithography, with feature sizes below 5 nm. The highest geometric complexity is attained with vat photopolymerization. For high throughput, parallel methods, such as photolithography (≈101 m2 h?1), are needed. This review offers a decision‐making tool for identifying which method to use for fabricating a structure with predefined properties.  相似文献   

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