3D打印工艺

随着现代科学技术的发展,3D打印技术已经应用到了很多的领域,比在在修复文物,工业制造方面都有着非常出色的表现。本文主要对3D打印工艺进行简单介绍(包括扫描数据,数据处理,3D打印)。     

压电喷墨3D打印射频多层电路工艺

针对传统射频电路板加工周期长、工艺流程复杂等问题,创新性地采用压电喷墨3D打印技术打印射频天线多层电路板,开展了打印材料、打印参数及打印工艺对成型效果的研究.经测试,打印的样件在外形尺寸、打印线路精度,以及驻波损耗等电性能方面均能达到设计指标要求.论证了压电喷墨3D打印技术可有效用于射频多层电路的快速制造和快速验证,为...     

3D打印技术及其应用发展研究

本文通过分析3D打印机的原理,总结了几种典型的3D打印技术,分析其市场应用和发展方向,得出3D打印技术的发展会引领第三次工业革命的发展。     

浅谈3D打印技术

3D打印技术作为当今的先进的制造技术,它的应用面相当的广泛,而且现正逐渐被用于一些产品的直接制造,这意味着这项技术正在普及。本文就以3D打印技术的原理,3D打印技术的发展状况,以及3D打印技术在生活中的应用这几个方面进行讨论。     

3D打印技术在设计成型工艺中的互动关系研究

随着社会的不断发展,各类新技术的出现改变了人们的生活以及生产方式,互联网技术、新能源技术等层出不穷的新兴技术已经改变了世界。3D打印技术是当前新生产模式中最为耀眼的黑科技,颠覆了传统的生产模式。文章旨在探讨3D打印技术在设计成型工艺中的互动关系。     

3D金属打印天线技术研究综述

近年来, 随着通信用户量的迅速增加和通信设备市场的快速发展, 数据速率高于10 Gbit/s的高速通信系统要求多种功能集成在天线上, 天线的制造要求趋于高精度、低成本和微型化. 3D打印或增材制造(additive manufacturing, AM)是一种直接从数字模型到零件制造的新兴产业技术, 可在短时间内生产出高精度和复杂的天线零件, 该技术已经成为了当前天线设计的研究热点.制造天线的AM技术主要有粉床熔合、材料挤压和材料喷射.文章首先简要介绍3D金属打印技术的基本原理、操作流程和分类, 接着重点分析几种3D金属打印天线技术的研究成果, 然后浅析3D金属打印天线技术的发展趋势, 最后对3D金属打印天线技术做了总结.     

浅谈3D打印技术及应用

3D打印从诞生到真正得以应用经历了十来年,而随着打印材料的不断丰富、直接生成成品的理念的形成及实现,为3D打印开创了非常广阔的前景。文章旨在通过它的原理介绍这一前沿技术,结合应用表述它无限的应用前景,并用一个完整的使用实例阐明它在制作模型中的应用过程及效果。     

知识产权视角下的3D打印技术

3D打印技术的出现,改变了长久以来人们制造产品的模式,对各行各业都带来了或多或少的冲击.这种冲击不仅仅体现在产品的生产方面,同时也体现在对传统知识产权的挑战方面.首先从专利层面对3D打印技术进行了梳理,分析了国内相关专利的分布情况;然后着眼于3D打印技术与知识产权制度的冲突问题,探讨了如何在保护知识产权的前提下发展3D打印技术.     

3D打印技术在电子设备行业的应用

3D打印是最近几年开始流行的,以成形速度快为特点的打印新技术,最基本的组成元件,就是数字模型,能够按照实物本身的特点和结构,进行分层次的打印,最终形成实际产品,这项技术涉及信息技术、材料科学、精密机械等多个学科领域。在电子设备行业中,3D打印技术也得到了广泛的应用,文章将对3D打印技术进行简单介绍,并对3D技术在电子设备行业中所发挥的作用和应用进行简单探讨。     

3D打印技术在骨肿瘤手术中的应用进展

由于骨肿瘤的发病部位解剖结构极为复杂以及患者的个体化差异,使传统技术在骨肿瘤的精确切除和术后功能重建中存在许多限制。作为一种新兴技术,3D打印在骨肿瘤的术前诊断、肿瘤精确切除以及术后功能重建中日益展现出其巨大的潜力,并帮助实现了患者的个体化治疗。文章就3D打印技术在骨肿瘤手术中的应用与研究现状作一综述。     

Sintering of Inkjet-Printed Silver Nanoparticles at Room Temperature Using Intense Pulsed Light

Intense pulsed light (IPL) was used to sinter printed silver nanoink patterns consisting of 20-nm to 40-nm silver nanoparticles dispersed in diethylene glycol (DEG). Three consecutive pulses at 50 J/cm² in less than 30 ms was sufficient to adequately sinter silver nanoink patterns for printed electronics without degradation of the substrates. This is an exceptionally short time compared with that of the conventional thermal sintering process. On the sintered conductive silver patterns, neck-like junctions between nanoparticles were observed using scanning electron microscopy (SEM). The melting temperature, 194.1°C, of silver nanoparticles was found using differential scanning calorimetry (DSC). Also, x-ray diffraction (XRD) was used to find the grain size of the printed silver nanoink patterns. The IPL-sintered silver pattern had a grain size of 86.3 ± 7.2 nm. From this work, it was found that the IPL-sintered silver pattern had a low resistivity of 49 ± 3 nΩ m, which is low enough to be used for printed electronics.     

Reactive Sintering of Copper Nanoparticles Using Intense Pulsed Light for Printed Electronics

Most commercial copper nanoparticles are covered with an oxide shell and cannot be sintered into conducting lines/films by conventional thermal sintering. To address this issue, past efforts have utilized complex reduction schemes and sophisticated chambers to prevent oxidation, thereby rendering the process cost ineffective. To alleviate these problems, we demonstrate a reactive sintering process using intense pulsed light (IPL) in the present study. The IPL process successfully removed the oxide shells of copper nanoparticles, leaving a conductive, pure copper film in a short period of time (2 ms) under ambient conditions. The in situ copper oxide reduction mechanism was studied using several different experiments and analyses. We observed instant copper oxide reduction and sintering through poly(N-vinylpyrrolidone) functionalization of copper nanoparticles, followed by IPL irradiation. This phenomenon may be explained by oxide reduction either via an intermediate acid created by ultraviolet (UV) light irradiation or by hydroxyl (-OH) end groups, which act like long-chain alcohol reductants.     

强脉冲光对胶原蛋白生物效应的实验研究

目的:探讨强脉冲光对胶原蛋白的生物效应与治疗皮肤光老化的作用机制.方法:采用波长640-1200nm的强脉冲光照射豚鼠背部皮肤;能量密度为30J/cm2,单脉冲发射,脉宽5ms.分别于照光后第1d、8d、15d、30d及45d切取皮肤样本,进行HE染色、苦味酸染色观察组织学改变;测量照光区皮肤羟脯氨酸的含量.结果:组织病理显示照光区从第8d起至第45d成纤维细胞增多,胶原纤维排列由疏松逐渐致密,明显强于非照光区.照光区皮肤羟脯氨酸含量从第8d起至第45d持续高于非照光区,具有显著性差异(p<0.001).结论:强脉冲光照射豚鼠皮肤后可刺激胶原蛋白增加,进而改善皮肤弹性,并至少能维持8周以上的时效性,为强脉冲光治疗皮肤光老化预测有效期的时效性与设定治疗间期提供参考依据.     

采用单片机技术的强光光子嫩肤机的研制

论述了一种利用单片机技术实现强光光子嫩肤机控制系统的研制结果。该系统包括由高分辨率触摸屏及彩色液晶显示器构成的人机交互界面,多脉冲强光电源的控制系统以及工作状态的监测和报警系统。研制结果显示：在强光光谱,脉冲形式,出光能量等方面达到了预期目标。经反复测试,该光子嫩肤机在整机性能的稳定性、可靠性以及光头出光能量的均匀性、稳定性方面可以达到光子嫩肤治疗的要求,满足医疗美容的使用要求。     

Reprintable Polymers for Digital Light Processing 3D Printing

3D printing is becoming a disruptive technology and shows great potential for various practical applications. Specially, digital light processing (DLP) 3D printing demonstrates advantages in high resolution and high efficiency. However, extensive production of infusible and insoluble thermosets in DLP printing causes serious resource waste and environmental problems after its disposal. Herein, a reprintable linear polymer is reported for repeatable DLP printing. Taking advantage of the dissolution of linear polymer in its monomer, printed objects can be recycled into liquid resin and reprinted via the same DLP. Polymerization kinetics and printing resolution of recycled resins and mechanical properties of reprinted polymers retain identical as the original. The thermoplastic nature of linear polymer endows 3D objects with welding and reshaping property. Recyclable composites are also successfully fabricated, and sustainable usage of high-value fillers comes true. This strategy helps to address environmental issues arising from unprocessable thermosets and may contribute to an efficient materials recycling.     

激光光子复合治疗面部毛细血管扩张症疗效观察

目的:探讨强脉冲光结合激光治疗面部毛细血管扩张的疗效.方法:自2008年9月至2009年9月,采用540nm强脉冲光及1064nm LP Nd:YAG激光对50例面部毛细血管扩张患者进行治疗.根据患者面部的皮肤类型及毛细血管扩张程度,选择适当的治疗参数,其中540nm强脉冲光能量密度13～16J/cm~2;1064nm LP Nd:YAG激光能量60～100mJ,治疗1～6次,平均1.84次,每次治疗间隔1个月.结果:治疗后随访3～6个月,治愈率68.00%,总有效率100%.无不良反应发生.结论:采用540nm强脉冲光结合1064nm LP Nd:YAG激光复合治疗面部毛细血管扩张症其疗效确切,效果满意.     

IPL照射对皮肤结构和胶原蛋白表达影响的实验研究

用强脉冲光照射SD(Sprague Dawley)背部皮肤后,通过HE染色观察皮肤组织学的改变,用RT-PCR观察皮肤Ⅰ型胶原蛋白mRNA的表达。定量分析皮肤Ⅰ型胶原蛋白蛋白质水平,为深入理解IPL治疗皮肤皱纹的作用机制提供分子生物学理论依据。     

Pixel-Level Grayscale Manipulation to Improve Accuracy in Digital Light Processing 3D Printing

Digital light processing (DLP) is a widely used additive manufacturing technique for functional applications due to its high accuracy and print speeds. However, a variety of factors such as pixel size, motion stage resolution, optical focus, and chemical properties of the resin limit DLP's minimum resolution. Recently, research into locally varying light intensities has led to the emergence of grayscale DLP printing, which offers new capabilities including sub-pixel manipulation of the printed shape. Here, a methodology is developed to enhance accuracy beyond what is typically capable for a given projector resolution by using pixel-level grayscale control to create round features from sharp pixels. A numerical representation of the DLP pixel shape is developed to account for the effects of the incident light patterns. A reaction-diffusion model is then used to predict the printed shapes before and after grayscale enhancement. This model is used to determine the optimal pixel intensities to match a target shape. Finally, the minimum feature size allowed by the proposed method is explored. The promising results represent an important step forward in raising DLP printing to higher accuracy, which will allow the fabrication of functional and structural components with smaller features or smoother faces.     

激光光子复合治疗酒渣鼻

目的:探讨强脉冲光结合激光治疗酒渣鼻毛细血管扩张的疗效.方法:自2008年9月至2011年10月,采用540、420 nm强脉冲光及长脉冲1 064 nm Nd:YAG激光对50例伴有/不伴有丘疹、脓疱的毛细血管扩张型酒渣鼻患者进行治疗.根据患者面部的皮肤类型及毛细血管扩张程度,选择适当的治疗参数,其中540nm强脉冲光能量密度13～16J/cm2;长脉冲1 064 nm Nd:YAG激光能量60～100 mJ,治疗1～6次,平均2.93次,每次治疗间隔1个月.以420 nm强脉冲光治疗炎性丘疹,能量密度7～12J/cm2.结果:治疗后随访3～6个月,治愈率24.00％,总有效率92.00％.无不良反应发生.结论:采用540、420 nm强脉冲光结合长脉冲1 064 nm Nd:YAG激光复合治疗伴有/不伴有丘疹、脓疱的酒渣鼻毛细血管扩张其疗效确切,效果满意.     

3D Conformal Printing and Photonic Sintering of High‐Performance Flexible Thermoelectric Films Using 2D Nanoplates

Flexible thermoelectric (TE) devices hold great promise for energy harvesting and cooling applications, with increasing significance to serve as perpetual power sources for flexible electronics and wearable devices. Despite unique and superior TE properties widely reported in nanocrystals, transforming these nanocrystals into flexible and functional forms remains a major challenge. Herein, demonstrated is a transformative 3D conformal aerosol jet printing and rapid photonic sintering process to print and sinter solution‐processed Bi₂Te_2.7Se_0.3 nanoplate inks onto virtually any flexible substrates. Within seconds of photonic sintering, the electrical conductivity of the printed film is dramatically improved from nonconductive to 2.7 × 10⁴ S m^?1. The films demonstrate a room temperature power factor of 730 µW m^?1 K^?2, which is among the highest values reported in flexible TE films. Additionally, the film shows negligible performance changes after 500 bending cycles. The highly scalable and low‐cost fabrication process paves the way for large‐scale manufacturing of flexible devices using a variety of high‐performing nanoparticle inks.