共查询到19条相似文献,搜索用时 218 毫秒
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使用Fe—Al/Cr3C2RE粉芯喷涂丝材,结合高速电弧喷涂技术(HVAS)在20钢上制备Fe~Al/Cr3C2RE复合涂层,同时以Fe—Al/Cr3C2涂层为比较。通过对涂层进行650℃下涂盐热腐蚀试验,借助扫描电镜观测腐蚀前后涂层表面形貌,利用XRD确定涂层的相组成,对腐蚀后涂层截面进行EDS分析。结果表明:Fe~Al/Cr3C2RE复合涂层在650℃时的涂盐抗热腐蚀性能明显优于基体20钢及同类型的复合涂层。Cr元素及稀土氧化物是Fe—Al/Cr3C2RE复合涂层性能优异的主要原因。 相似文献
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使用Fe-Al/Cr3C2RE粉芯喷涂丝材,结合高速电弧喷涂技术(HVAS)在20钢上制备Fe-Al/Cr3C2RE复合涂层,同时以Fe-Al/Cr3C2涂层为比较。通过对涂层进行650℃下涂盐热腐蚀试验,借助扫描电镜观测腐蚀前后涂层表面形貌,利用XRD确定涂层的相组成,对腐蚀后涂层截面进行EDS分析。结果表明:Fe-Al/Cr3C2RE复合涂层在650℃时的涂盐抗热腐蚀性能明显优于基体20钢及同类型的复合涂层。Cr元素及稀土氧化物是Fe-Al/Cr3C2RE复合涂层性能优异的主要原因。 相似文献
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电弧喷涂技术及其在火电厂的应用研究 总被引:7,自引:0,他引:7
阐述了电弧喷涂技术的原理和特点,针对火力发电感和锅炉水冷壁热蚀问题,自行开发了SL3O专用丝材。通过该材料和其他几种材料电弧涂涂层的耐热腐蚀性能对比试验,证明了SL3O材料制备的涂层具有优异的性能价格比,适于在我国大范围内使用。此外,还介绍了电弧 相似文献
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介绍了丝材火焰喷涂和丝材电弧喷涂工艺的基本原理和使用的主要设备,以及热喷锌的工艺要求及其技术优势。 相似文献
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B_4C材料可用作原位保护涂层防止托卡马克面向等离子体部件中的钨块受到诸如腐蚀、开裂以及颗粒溅射等损伤。本文采用感应耦合等离子体(ICP)喷涂法在惰性气氛下制备B_4C/W涂层,对不同喷涂距离下的涂层进行结合力研究,并对其表面形貌进行分析,同时还对涂层的物相及组成成分进行了分析。不同喷涂距离下的拉伸测试结果展示了涂层结合强度的变化趋势,结果表明,在喷涂距离比较近时涂层的结合强度反而较弱。优化条件下的涂层结合强度值为5.32MPa。涂层表面形貌的SEM图像分析,进一步验证了结合强度的研究结果。与初始B_4C粉末相比,涂层的主要相成分和化学成分没有发生改变。 相似文献
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锅炉"四管"防腐耐磨涂层性能研究 总被引:3,自引:0,他引:3
对锅炉“四管”常用的3种超音速电弧喷涂涂层进行了高温腐蚀和冲蚀性能试验,对涂层的组织结构、结合强度、显微硬度进行分析,获得了各种喷涂层的综合性能.结论可为火电厂锅炉“四管”的高温防腐耐磨提供技术依据. 相似文献
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在分析接地网腐蚀机理的基础上,提出利用超音速活性电弧喷涂新技术制备导电防腐涂层来解决目前接地网材料耐蚀性能差的问题。分析了超音速活性电弧喷涂新技术的工作原理及其应用于接地网防腐的可行性,并特别提出未来接地网导电防腐涂层的设计思路。 相似文献
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等离子喷涂的陶瓷涂层的特性 总被引:1,自引:0,他引:1
测量分析了三种等离子喷涂的陶瓷涂层 (Al2 O3 、Cr2 O3 、Cr3 C2 +NiCr)的显微组织、孔隙率、显微硬度及结合强度等性能 ,并通过吹砂试验对三种涂层的抗磨损性能进行了比较。结果表明 ,在抗冲蚀磨损方面 ,Cr2 O3 陶瓷涂层优于Al2 O3 及Cr3 C2 +NiCr涂层。 相似文献
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为实现用碳化钨粉末作为喷涂材料制备电爆喷涂涂层,开发了一种连续送粉的管内约束电爆喷涂方法,试验研究了初始电压及喷涂距离对涂层特性的影响。结果表明:在一定的喷涂距离范围内,这种方法可以使碳化钨颗粒全部以熔融状态形成液相涂层,这类涂层致密度较高,与基体有较高的结合强度,当喷涂距离很小时,如1mm,涂层表面呈现气相沉积的特征。随着喷涂距离的增大,爆炸产物中部分熔融粒子开始凝固成固相颗粒,形成含有固相颗粒的涂层,这种涂层的致密度下降,与基体结合强度较低。随着初始电压的升高,获得液相涂层和含有固相颗粒的涂层的喷涂范围增大。 相似文献
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采用氧乙炔火焰喷涂方法制备了含量不同的聚苯酯为造孔剂(PPHBA)的NiO/Al_2O_3涂层,系统地研究了造孔剂含量对涂层组织结构和气体渗透率的影响.研究结果表明,造孔剂的添加量对涂层的组织结构有显著影响,粉末中不添加造孔剂时,涂层的孔隙较少且分布均匀;涂层中添加造孔剂后,大气孔数量显著增多,且随着粉末中添加造孔剂含量的增加而增大.NiO/Al_2O_3涂层经高温还原处理后的渗透率显著高于喷涂态涂层渗透率,且气体渗透率随着喷涂粉末中造孔剂含量增加而增大.NiO还原处理后涂层的气体渗透率比喷涂态提高约一个数量级. 相似文献
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AbstractIn this work, the polyurethane coated urea (PCU) and PE coated urea (PECU) were prepared by spraying the coating material. The isocyanates coatings on the surface of urea and granule inorganic compound fertilizer (NPK) were prepared and their infrared spectra were compared. The polyurethane coatings of PCU was analyzed by IR. The interface morphology between the PU coating and PE coating PECU and the surface of urea was compared by scanning electron microscope. The inner and outer surfaces morphology of polyurethane coatings was studied. The results showed that the peak of -NCO groups in the infrared spectrum of the coating on urea was weaker than of the coating on NPK, while the peaks of N-H, C-N and C?=?O were all relatively stronger, which proved that -NH2 in urea reacted with -NCO during the coating formation. SEM images showed that there was an obvious gap between PE coating and its urea core, while PU coating was tightly bonded with the surface of urea core, and the inner surface of PU coating had something undissolved after fully dissolved in water, which further illustrated that urea participate in the reaction of isocyanates with polyols. All of this results demonstrated that the amine group (-NH2) in urea reacted with the -NCO group in isocyanates and urea linkage (-NH-CO-NH-) was formed in the polyurethane coating. 相似文献
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N. A. Loginova S. V. Grigor’ev E. E. Lapin S. I. Pogorelov A. V. Ryzhenkov 《Thermal Engineering》2016,63(5):355-359
Fast-mounted heat-insulating constructions based on foamed synthetic rubbers, polyethylene, and polyurethane are characterized by a thermostability up to 150°C and emit toxic substances when burnt. However, there is a need for heat insulation of surfaces with higher coolant temperatures, such as pipelines, equipment of nuclear and thermal power plants, and heating systems with remote heat sources. One of the most promising types of heat insulation materials for creation of fast-mounted heat insulation constructions is the syntactic foams or thin-film multilayer heat-insulating coatings (TFMHIC), which are created using hollow microspheres and various types of binders. The formation of TFMHIC on the heat-insulating surface is carried out mostly by means of spraying methods that have well proven themselves at coating on flat and cylindrical surfaces of large area, but they turned out ineffective for cylindrical surfaces with a diameter of 300 mm and less, since they are characterized by a large degree of carryover of composite material. This article analyzed the binders and microspheres promising to create the fast-mounted heat-insulating constructions based on TFMHIC with high thermostability. Based on the analysis, a conclusion is drawn that organicsilicon binding and glass microspheres are promising for use in the heat-insulating constructions with thermostability up to 300°C. The results of experimental research are given that point to the possibility of predicting the optimal composition of heat-insulating material characterized by a high degree of filling with microspheres with maintaining the mechanical strength, by means of performing the analysis of rheological characteristics of nonpolymerized liquid compositions of heat-insulation material. The index of tensile strength in bending was the criterion for evaluating the mechanical strength of heat-insulating material. The critical volume concentrations of filling the heat-insulating material with glass microspheres, whose excess leads to a reduction in its strength characteristics, are determined. 相似文献