钛合金高温玻璃—陶瓷保护涂料的研究

开发出一种用于高温钛合金热加工条件下的防氧化玻璃－陶瓷保护涂料，该涂料是以硼铝硅酸盐玻璃为主体，加入有机粘结剂，用水做溶剂，配制而成的水悬浮液。讨论和研究了由该涂料在高温条件下形成涂层，以及涂层对钛合金保护作用的机理和涂料配方的设计原则。通过能谱（EDS）和恒温增重的分析，比较了有涂层保护和无涂层保护钛合金片表面氧含量的差异，表明了所制备的玻璃－陶瓷涂料在高温下对钛合金有很好的保护作用。     

高温型热处理保护涂料的研究与应用

试验研究了6种西文的热处理保护涂料，比较分析了它们的保护效果及其产生的原因，结果表明，由H3BO3和化合物A组成的保护涂料在1100℃的热处理条件下仍然能保持良好的保护效果，是一种较理想的高温型热处理保护涂料，同时指出，活性成膜物和对粘态膜起“钉扎”作用的高熔点物是高温热处理保护涂料的必备成分。     

煤基聚苯胺防腐蚀性能的研究

采用加速浸泡和电化学测试方法，研究了煤基聚苯胺(CPANi)用于防腐蚀涂料中对碳钢的保护性能和效果。结果表明，煤基聚苯胺对涂料的性能没有太大的影响，用于涂料中对基体金属(碳钢)具有明显的阳极保护作用。     

涂层产生气泡的原因及控制方法

随着涂料工业的快速发展，涂料的品种、档次不断升级，人们对涂料的保护性、装饰性提出了越来越高的要求，因此，涂料的表面状态十分引人关注。气泡的存在，严重影响了涂膜的外观效果，往往会造成涂膜缩孔、针孔、疵点、鱼眼等弊病。所以涂层气泡问题，已不仅影响到涂膜的保护效果，而且也大大影响了涂膜的装饰效果。     

一种高性能防腐涂料的研制

防腐涂层是广泛采用的有效防腐手段，它不仅对腐蚀介质有屏蔽作用，耐用能钝化被保护金属，起缓蚀和电化学保护作用，在冲蚀试验槽防腐涂层选择时，诸多公认性能良好的涂料在短时间就起泡、剥落，由此我们开发研制了一种能室温固化     

聚苯胺防腐蚀涂料的研究进展

综述了国内外聚苯胺防腐蚀涂料的研究进展。介绍了聚苯胺的结构、性能和聚苯胺防腐蚀涂层的制备方法、测试方法，及相关的防腐蚀机理。聚苯胺的防腐蚀机理主要是有良好的屏蔽作用、阳极保护作用和缓蚀作用。提出了聚苯胺研究中有待进一步深入的问题和对这类涂料的应用前景的展挈。     

高速保护气流向对光纤激光深熔焊接羽辉的影响

光纤激光深熔焊接羽辉可分为底部摆动羽辉和类似于激光束聚焦形态的狭长形羽辉.采用6 kW的光纤激光焊接低碳钢，对比研究了旁轴高速保护气流对这两部分羽辉的影响.结果表明，高速保护气流对狭长形羽辉具有明显的抑制效果，但其流向对焊接过程稳定性的影响则明显不同：气流逆焊接方向时飞溅多、熔深浅、焊缝成形差；气流沿焊接方向时飞溅少、熔深加深、焊缝成形良好，保护气流逆焊接方向时，小孔口前部凸起液柱发生偏折，小孔口缩小、熔池波动更剧烈.进一步分析表明，保护气流逆焊接方向时，小孔口前部凸起液柱向小孔口偏折并堵塞小孔、影响底部摆动羽辉的喷发是致使焊接过程稳定性恶化的主要原因.在光纤激光焊接中，布置保护气时应该考虑其流向对底部摆动羽辉喷发状态的影响.     

氨冷器127CA／CB的保护技术

本文简术了氨冷器１２７ＣＡ／ＣＢ腐蚀的情况，介绍了ＰＶＡ涂料保护技术，电化学保护在氨冷器上的应用，提出了牺牲阳极保护加涂料联合保护方法。     

低损耗大芯径能量光纤涂料的配方设计与应用

目的设计低损耗大芯径能量光纤涂料的配方并讨论其应用。方法以乙烯基硅油、巯基硅油、甲基丙烯酸三氟乙酯(TRIFEMA)、全氟十一烷基丙烯酸酯(FA)、氟橡胶、四氢呋喃丙烯酸酯GM61P00(THFA)和聚氨酯丙烯酸酯(PU)为主要组份,设计不同配方的光纤涂料,并考察其折射率、透过率、凝胶含量和光纤损耗等性能,筛选最优配方。结果低损耗大芯径能量光纤涂料的最佳配比为m(乙烯基硅油)∶m(巯基硅油)∶m(TRIFEMA)=27∶5∶1,其涂层的折射率为1.392,透过率为99.23%(波长为850 nm时),制得大芯径能量光纤的抗拉强度为4392 MPa,传输损耗为6.6 d B/km。结论全氟化合物虽然能使涂料的折射率较低,但是其固化时存在缺陷,会导致光纤损耗较大。氟硅涂料具有优良的润湿性能,涂层附着力强,且各项性能指标均符合光纤使用要求。     

光纤光栅传感器金属化保护及钎焊嵌入42CrMo钢

针对光纤光栅传感器保护方面及向金属中封装嵌入方面现存的问题,采用化学镀和电镀结合的方法对光纤光栅传感器进行镀镍金属化保护,随后用钎焊的方法将传感器嵌入42CrMo结构钢中,从而获得智能金属结构.结果表明,镀层与传感器结合界面无缺陷,镀镍金属化使光纤获得了良好的保护,为后续钎焊嵌入金属做好了准备;钎焊对传感器影响较小;对钎焊后获得的智能结构进行了温度监测,表明传感器的灵敏度提高1倍,温度与波长变化成线性关系.     

碳纤维二氧化硅涂层新工艺的研究

本文采用溶胶—凝胶法,将碳纤维浸入硅酸乙酯溶液中,然后通过水解和干燥在纤维表面形成抗氧化、耐高温的SiO_2涂层。实验结果表明:此法所获涂层均匀;调整溶液的润湿性及粘度可改变涂层厚度;涂后的碳纤维与Mg能很好润湿。     

Synthesis of nanostructured SiC coatings on carbon fibres by in situ reaction sintering with milled powders

A homogeneous and continuous nanostructured SiC coating on the surfaces of T700 and M40 carbon fibres was synthesized by in situ reaction sintering at 1450 °C with the milled Si and C powders, and the coating was characterized. The results show that the slurry is easier to stick to the surface of M40 carbon fibres than that of T700 carbon fibres. A homogeneous, continuous and crack-free nanostructured SiC coating is formed on the surface of these two kinds of carbon fibres. The SiC coating is composed of huge amounts of nanometric SiC crystals. Coatings with thickness of about 30 nm and 150 nm were fabricated. Carbon fibres with SiC coating whose thickness is about 30 nm display good flexibility.     

Silica xerogel coating on the surface of natural and synthetic fabrics

SiO₂ thin films prepared from tetraethylorthosilicate by sol-gel method are coated on the fabric substrates of natural and synthetic fibres. The add-ons and leaching behaviors of silica xerogel coating on the surface of cotton, flax, nylon-66 and poly(ethylene terephthalate) fabrics are studied to compare the interaction and adhesion of the silica coating with different fabrics. Scanning electron microscopy (SEM) for the morphology of surface, BET specific surface area, FTIR-ATR analysis and X-ray diffraction (XRD) for the microstructure of fibres are used to characterize the surface changes induced by the silica coating. The results show that the chemical composition and structure of fibres play a dominant role in influencing the adhesion of the coating on the fabric surface.     

一种新型的碳纤维和碳纳米管化学镀镍工艺

碳纤维是最重要的复合材料增强体之一,而碳纳米管比碳纤维具有更好的力学性能,对他们的表面改性将会对复合材料性能有很大影响。试验实现了一种对碳纤维和碳纳米管通用的化学镀镍工艺。通过对基体较好的预处理,在基体上成功地完成了化学镀镍并且较好的控制了镀层成分。同时还探讨了施镀温度、pH值和搅拌方式等对镀层的影响,试验发现pH值控制在9~10之间,温度控制在70℃附近并采用氮气搅拌可以获得较满意的施镀效果。     

C_F／Al复合材料界面质量控制研究

采用挤压铸造工艺参数最优化、纤维表面涂层等手段，研究ＣＦ／Ａｌ复合材料界面质量控制和提高复合材料强度的效果．碳纤维和涂覆ＳｉＣ的碳纤维增强Ａｌ－１０Ｓｉ复合材料的挤压铸造最佳温度分别为Ｔｆ＝７３３Ｋ，Ｔｍ＝１０３３Ｋ和Ｔｆ＝７５３Ｋ，Ｔｍ＝１０５３Ｋ．不同的涂层对界面质量有不同的影响，那些阻止界面反应、调节界面结合状态的涂层增强效果较好，如ＰＣＳ－ＳｉＣ可使复合体系强度提高８９％；Ｋ２ＺｒＦ６也有改善界面质量的功能，但加入量过大，导致复合材料强度的下降．随界面剪切强度的增大，复合材料强度增加．结果表明高模量碳纤维所允许的最佳界面剪切强度（τ０），远远大于低模量碳纤维所允许的τ０．从而具有较好的增强效果．     

Processing and properties of copper-coated carbon fibre reinforced aluminium alloy composites

Aluminium alloy matrix composites with carbon fibre reinforcement were prepared by stir casting method. In order to avoid any interfacial reactions in the carbon fibre reinforced composites, the carbon fibres were coated with copper. The fibres were coated by electroless coating method and then characterized. Composites containing different amounts of carbon fibres were prepared by stir casting and then subjected to age-hardening treatment. Fibre distribution was fairly uniform in the composites containing up to 4 wt% carbon fibres. Tensile strength of the composites was found to be increasing up to 4 wt% carbon fibre.     

Einfluß einer Faserbeschichtung aus pyro-Carbon auf das elektrochemische Korrosionsverhalten von Kohlenstoffaser/Aluminium-Verbunden

Influence of pyro-carbon fibre coating on the electrochemical corrosion behaviour of carbon fibre/aluminium composites Carbon fibre reinforced aluminium belongs to leightweight materials with crucial potentials for practical application. The electrochemical corrosion of this material was investigated. Expectedly, the reinforcement of the aluminium with 70 vol.-% carbon fibres (Toray T800) leads to a remarkable decrease of the corrosion resistance, which was assessed by means of immersion tests (3.5% NaCl solution), potentiodynamic measurements (3.5% NaCl solution) and after exposure of the MMCs in a climate chamber (DIN EN ISO 6988). The coating of carbon fibres with a pyrolytical carbon layer is useful in terms of providing a sufficient fibre protection during the processing of the MMCs. In that case, chemical interactions between the fibres and the aluminium can be regulated. Furthermore, there is the possibililty to tailor a definite mechanical behaviour of the MMCs due to the application of the pyrolytical carbon layer. Because the utilization of pyrolytical carbon layers on carbon fibres is necessary in some cases, the electrochemical behaviour of MMCs made from coated carbon fibres and aluminium was investigated as well. It was found that the used pyrolytical carbon layer on the T800 fibres caused a further significant degradation of the corrosion resistance. A probable reason for that may be an increased reactivity of the pyrolytical carbon, which was syntheticized during a CVD (chemical vapour deposition) process.     

Enhanced corrosion protection by powder coatings on hot rolled steel (HRS) for high-temperature applications

Hot rolled steel (HRS) has long been a major product to the motor industry for bodywork, as galvanised steel (zinc coatings), and it is widely used in building and as tinplate (including tin and chrome oxide coatings) for food, etc. can-making. Among more specialist uses its moderate production costs makes it suitable for the manufacturing process. In this study, newly developed corrosion protection enhanced silicone based powder coating was evaluated on hot rolled steel (HRS). The powder coating in this study was developed to withstand high temperatures up to 550°C without any degradation. In the study silicone resin was incorporated with fillers, corrosion inhibitors and fibres at various compositions to achieve maximum heat resistance and improved corrosion resistance. Protective behaviours of the differently formulated powder paints were investigated before and after heat exposure. The developed paint system was evaluated using various test methods such as heat resistance, salt spray, Electrochemical Impedance Spectroscopy (EIS), adhesion test and microstructure study using SEM. The evaluation of test results revealed that powder coating combining zinc dust particles and mineral fibres have better performance due to better corrosion and adhesion stability in the corrosive environment before and after heat exposure up to 550°C.     

Development of advanced hybrid materials with the help of pulse electrodeposition

Pulse electrodeposition has been applied to enhance properties of two different types of lightweight construction materials, a periodic cellular material (PCM) and a micro-sandwich. For the PCM, the deformation behaviour of the nanocrystalline Ni-18 wt-% Fe sleeve material (bulk samples) has been investigated up to 548?K. The material exhibits plasticity of >30% fracture strain at higher temperatures (423?K) compared to <?15% at room temperature (295?K). TEM characterisation shows that coarser grains are present, which enable strain hardening by intra-granular dislocation accumulation. This leads to larger fracture strains at higher temperatures. Hence, for allowing application of the PCM at elevated temperatures (e.g. at temperatures of more than 400?K), the sleeve material has to be stabilised against deformation-induced grain growth. For the micro-sandwich, the ～100?μm thick pulse-electrodeposited nickel coating on either the face sheets or polymer fibres of the sandwich core can provide extra strength. With respect to the fibres, the plating process needs to be improved further to achieve a continuous and homogeneous coating.     

Corrosion-erosion of TiN-PVD coatings in collagen and cellulose meat casing

The meat casing industry works with highly fibrous materials and low pH conditions. The pumps propelling the gel must therefore be highly corrosion-erosion resistant. In fact, the most common failure in this medium is corrosion, erosion or, most commonly, a combination of both. Coatings are thus required to protect the pump surface and maintain the operational conditions. TiN-PVD coatings seemed to be an attractive alternative amongst the range of options to extend pump lifetime. However, despite the greater chemical inertia expected of TiN, the combined effect of corrosion and erosion can induce a fast attack on the material. The present paper analyses failure of a TiN coating with a single-layer configuration in contact with an edible slurry of collagen used in the meat casing industry. The degradation mechanism comprises two different steps. Firstly, the acidic components reach the base steel through the pores, promoting severe dissolution of the steel substrate and leaving the TiN coating without support. Secondly, the coating detaches under working conditions and merges with the casing solution. Finally, the fibres together with the hard particles erode the pump walls, leading to fast deterioration.