树脂基复合材料制件表面金属化技术探讨

主要讨论了树脂基复合材料制件的表面金属化技术,着重介绍了真空蒸镀、真空离子溅射、电铸法和金属喷涂转移法等四种金属化方法。可根据制件的具体情况选择最适宜的金属化方法     

复合材料转移法金属化脱模剂工艺研究及应用

主要研究了复合材料转移法金属化所用脱模剂的制备及应用。通过对脱模剂配方和成膜工艺的研究 ,提高了转移金属层表面的平整度和光洁度 ,该技术的应用成功地实现了大型复合材料制件的表面金属化。由于该脱模剂的防锈性和可剥性 ,它可推广应用于制件运输和储存过程中的保护。     

转移法金属化技术在树脂基碳纤维复合材料天线上的应用

主要讨论了复合材料天线反射面的转移法金属化技术。通过对转移法金属化工艺的研究，成功实现了大型树脂基碳纤维复合材料天线反射面的金属化。表面金属层与基材结合牢固，表面平整光滑。     

高分子表面金属化技术

高分子表面金属化是对高分子材料表面进行改性处理使其具有良好物理性能、力学性能及金属光泽的表面技术,广泛应用于高分子导电、薄膜修饰、电磁屏蔽等领域。本文综述了高分子表面金属化的两大类技术方法,即干法镀膜和湿法镀膜。介绍了几种典型的表面处理技术,如真空镀膜、喷涂金属转移法、化学镀、化学还原金属化以及电镀,并总结了它们的技术特点以及在科学研究和工业生产应用中的难点。阐明了从传统电镀技术发展而来的高分子表面直接电镀工艺的优势,直接电镀工艺省去了电镀前的活化工序,缩短了工艺时间,避免了电镀前工艺对环境造成的污染,成为高分子表面金属化技术发展的新方向。     

碳纤维复合材料（CFRP）在电子工程中的应用

（续上期）（3）反射面金属化技术采用CFRP制造天线反射面时，为了达到高的射频反射能力，需采用金属材料作抛物面的反射层，例如铝。国外采用高模量CFRP制造的天线反射面可应用在K波段（18GHZ）以下，T300CFRP天线也可以用于SGHZ而无需金属化。CFRP抛物面表面金属化方法可以采用：·真空蒸镀或磁控溅射铝、银层·喷涂导电涂层后电镀·预埋金属网·喷涂金属（火焰法和等离子法）图2热循环次数对CTE的影响·化学镀后再电镀加厚·在模具上喷涂金属后再转移等金属化技术上述多种金属化方法中，以在模具上喷涂金属（如铝）再转移到C…     

导电玻璃钢制品的制造工艺

对制造导电玻璃钢制品的导电复合材料成型工艺、导电涂料喷涂工艺、热喷涂工艺和表面金属化工艺等的原理及其应用范围作了介绍和讨论。     

天线罩表面导电涂层的制备工艺及性能研究

为解决由碳纤维复合材料制备的雷达天线罩自身导电性能差、反射能力弱和空间防护能力不高的问题，先通过电弧喷涂技术在Q235钢模具表面制备铝涂层，然后在碳纤维复合材料固化的过程中将其转移至天线罩表面。研究了电弧喷涂时的主要工艺参数对铝涂层孔隙率的影响，得到最佳的工艺参数为：空气压力0.6 MPa，喷涂距离300 mm，喷涂电压28 V。扫描电镜表征和热淬法测试表明，通过上述方法在天线罩表面制备的导电涂层均匀连续，表面致密，无裂纹、空腔和外来夹杂物，结合力良好。     

复合材料卫星反射器机器人喷涂过程分析及工艺参数研究

使碳纤维复合材料反射器的表面金属化可以有效降低电磁波在反射器表面的能量消耗,采用机器人进行喷涂可以有效解决人工喷涂产品质量不稳定以及效率低下的问题。基于机器人的喷涂过程,分析了喷涂过程的影响因素:一是机器人轨迹,包含机器人行走路径模式和相邻行走路径的间距;二是喷枪单元参数,包含各路气压值、喷涂丝材的走丝速度、喷枪的行走速度以及喷枪距离基体表面的相对高度。以某反射器为基础,确定了合适的自动喷涂参数,制备了某含有金属涂层的复合材料卫星天线反射器,孔隙率检测结果为0.162%,粗糙度结果为Ra=1.417μm,均优于常规要求,为后续的优化使用打下了基础。     

多面体金属效果颜料的制备与应用

通过磁控溅射镀膜工艺,采用铝靶为溅射源,成功实现铝单质在微米级二氧化硅粉体表面的沉积,制备出新型多面体金属效果颜料。重点比较了多面体金属效果颜料与铝颜料在注塑制件中的流痕与熔接痕差异,同时,研究了多面体金属效果颜料对塑料基材物性的影响及加工工艺对多面体颜料所呈现表观效果的影响。最后,采用多面体金属效果颜料共混入塑料基材中成型出“无流痕”免喷涂制件。结果表明,与传统铝颜料相比,多面体金属效果颜料表现出良好的金属质感,流痕几乎完全消除,熔接痕亦大幅度减轻,并进一步从理论角度分析和解释了产生上述流痕和熔接痕差异的原因;与喷涂制件相比,“无流痕”免喷涂制件更环保,成本更低,表观效果更加独特,并得到了消费者认可,成功实现了商业化量产。     

纤维增强树脂基复合材料表面金属化研究进展

对纤维增强树脂基复合材料表面金属化研究进行综述,分别介绍了纤维与树脂在复合前的表面金属化方法,纤维与树脂复合后固化前的表面金属化方法以及纤维与树脂固化后表面金属化方法;并且对复合材料在不同阶段的金属化方法优缺点进行分析介绍,结合航空航天领域在复合材料表面金属化的需求,分析了不同的金属化方法在航天复合材料结构件上的适用性。     

Electron Probe Microanalysis of Ceramic-to-Metal Seals

The electron microprobe technique was used to provide information on reactions occurring during the metallizing of alumina ceramics and their subsequent brazing to metal members. During a 1425°C metallizing firing, the refractory metal component of the metallizing paint sintered and bonded to, but did not measurably diffuse into, the oxide phases of the seal systems studied. Conversely the oxide components of the paint reacted with the alumina phase and interdiffused with the grain boundary phase of the ceramic. Copper and copper-gold alloys with small amounts of nickel did not attack a copperplated molybdenum metallizing layer. Use of nickel plate is to be avoided with such brazes.     

Friction and wear characteristics of PTFE composites filled with metal oxides under lubrication by oil

Four kinds of polytetrafluoroethylene(PTFE)-based composites, such as pure PTFE, PTFE+30%(v)PbO, PTFE+30%(v)Pb₃O₄, and PTFE+30%(v)Cu₂O composite, were prepared. The friction and wear properties of these metal oxides filled PTFE composites sliding against GCr15 bearing steel in both dry and lubricated conditions were studied by using an MHK-500 ring-block wear tester. Then the worn surfaces of these PTFE composites and the transfer films of these PTFE composites formed on the surface of GCr15 bearing steel were examined by using a Scanning Electron Microscope (SEM) and an Optical Microscope, respectively. Experimental results show that the friction and wear properties of these metal oxide-filled PTFE composites can be greatly improved by liquid paraffin lubrication, and the friction coefficients can be decreased by one order of magnitude. Meanwhile, the interactions between liquid paraffin and metal oxide-filled PTFE composites, especially the absorption of liquid paraffin into the surface layers of these PTFE composites, reduce the mechanical strength and the load-carrying capacity of these metal oxide-filled PTFE composites. This leads to the deterioration of the friction and wear properties of these PTFE composites. Investigations of the frictional surfaces show that Pb₃O₄, Cu₂O, and PbO enhance the adhesion of the transfer films to the surface of GCr15-bearing steel, and thus promote the transfer of the PTFE composites onto the surface of GCr15-bearing steel. Therefore, they greatly reduce the wear of the PTFE composites. However, the transfer of these PTFE composites onto the counterfaces can be greatly reduced by lubrication with liquid paraffin. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 85–93, 1997     

水披覆转印工艺

介绍了水披覆转印工艺流程。指出了前处理、喷底漆、烘干、转印、补膜和喷面漆等各工艺注意事项。对影响转印膜质量的各种因素包括活化剂、界面剂、转印温度等进行了讨论。     

谈FRP模具表面金属化工艺

模具表面金属化是ＦＲＰ模具的发展趋势。本文详细介绍了表面喷涂金属制模的工艺技术。     

Wetting of Original and Metallized High-Alumina Surfaces by Molten Brazing Solders

An apparatus using the sessile-drop method is described for determining surface tension and wettability data of liquid-solid systems at elevated temperatures in vacuum and in controlled atmospheres. The relative merits of some of the current methods of metallizing alumina ceramics are evaluated in terms of solder wetting. The wetting by molten brazing metals and alloys is reported as a function of time in terms of contact angle on surfaces of high-alumina ceramics with and without various types of hightemperature metal coatings.     

树脂基复合材料防护涂层研究进展

树脂基复合材料因其耐热性和耐冲蚀磨损性能比较低,限制其在航空发动机上的应用。本文针对当前树脂基复合材料特点,对其防护涂层国内外的研究现状进行了介绍,探讨了不同涂层的应用特点并且提出树脂基复合材料防护涂层性能的研究方向,通过降低喷涂过程中基体表面温度,提高涂层与基体的结合强度,创新喷涂工艺,改良喷涂材料,进而解决其喷涂工艺过程中遇到的问题。     

Comparative study on the tribological properties of laser post-treated and untreated AISI304 stainless steel matrix composite reinforced with hard ceramic particles (TiB2–TiN–SiC) and prepared by ex-situ P/M route

This work highlights evaluation of suitable process parameters to result significantly higher hardness, fracture toughness and wear resistance in metal matrix composites (MMC) developed with different proportions of reinforcements, namely, TiB₂, TiN, and SiC in steel (AISI 304). The composites are developed through powder metallurgical route and are subsequently laser surface glazed. Thorough characterizations of composites’ mechanical and tribological behaviors before and after laser surface treatment and application of response surface methodology (RSM) for modeling and analysis of its behavioral responses towards variations in process parameters are performed.     

Investigating the Effects of SiC Particle Sizes on Microstructural and Mechanical Properties of AA5059/SiC Surface Composites During Multi-Pass FSP

Silicon - Friction stir processing (FSP) is a quite recently developed solid-state process involving surface modifications for fabricating metal matrix surface composites (SCs). In this work, FSP...