为了使铝基粉芯线材电弧喷涂涂层获得优良的涂层性能,选择涂层孔隙率为判据,通过正交试验和OLYC IA m3金相图像分析系统对铝基粉芯线材电弧喷涂工艺进行了优化,同时采用SprayW atch热喷涂监控系统对喷涂过程中粒子的飞行速度和温度进行...为了使铝基粉芯线材电弧喷涂涂层获得优良的涂层性能,选择涂层孔隙率为判据,通过正交试验和OLYC IA m3金相图像分析系统对铝基粉芯线材电弧喷涂工艺进行了优化,同时采用SprayW atch热喷涂监控系统对喷涂过程中粒子的飞行速度和温度进行了测定.经研究得到了铝基粉芯丝材电弧喷涂的最佳工艺参数.结果表明,影响铝基涂层致密性的工艺因素按主次顺序分别为喷涂气压、喷涂电压和喷涂距离;在所选试验范围内,随气体压力和喷涂电压的增大、喷涂距离的减小,涂层的孔隙率降低;在优化的喷涂工艺参数条件下,铝基涂层最小孔隙率可达1.3%.展开更多
The oxidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings were studied.The oxidation experiment was conducted in air,and the hot corrosion was conducted in the Na2SO4-30%...The oxidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings were studied.The oxidation experiment was conducted in air,and the hot corrosion was conducted in the Na2SO4-30%K2SO4 environment, in the temperature range of 550-750℃for periods up to 160 h.The corrosion kinetics was tested with the thermogravimetric method. The corrosion products were characterized by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX)and X-ray diffractometry(XRD).As indicated by the results,both types of coatings possess high corrosion resistance,especially the nanostructured NiCrC coating.The enhanced grain boundary diffusion in the nanostructured coating not only promotes the formation of a denser Cr2O3 scale with a higher rate,but also helps to mitigate the Cr depletion at the metal/scale interface.The less porosity of the nanostructured coating is also thought to be beneficial to the anti-corrosion properties.展开更多
文摘为了使铝基粉芯线材电弧喷涂涂层获得优良的涂层性能,选择涂层孔隙率为判据,通过正交试验和OLYC IA m3金相图像分析系统对铝基粉芯线材电弧喷涂工艺进行了优化,同时采用SprayW atch热喷涂监控系统对喷涂过程中粒子的飞行速度和温度进行了测定.经研究得到了铝基粉芯丝材电弧喷涂的最佳工艺参数.结果表明,影响铝基涂层致密性的工艺因素按主次顺序分别为喷涂气压、喷涂电压和喷涂距离;在所选试验范围内,随气体压力和喷涂电压的增大、喷涂距离的减小,涂层的孔隙率降低;在优化的喷涂工艺参数条件下,铝基涂层最小孔隙率可达1.3%.
基金Project(2002AA331080)supported by the National High-tech Research and Development Program of China
文摘The oxidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings were studied.The oxidation experiment was conducted in air,and the hot corrosion was conducted in the Na2SO4-30%K2SO4 environment, in the temperature range of 550-750℃for periods up to 160 h.The corrosion kinetics was tested with the thermogravimetric method. The corrosion products were characterized by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX)and X-ray diffractometry(XRD).As indicated by the results,both types of coatings possess high corrosion resistance,especially the nanostructured NiCrC coating.The enhanced grain boundary diffusion in the nanostructured coating not only promotes the formation of a denser Cr2O3 scale with a higher rate,but also helps to mitigate the Cr depletion at the metal/scale interface.The less porosity of the nanostructured coating is also thought to be beneficial to the anti-corrosion properties.
