The coating microstructure of hot-dip aluminum (HDA) of deformed low-carbon steel containing RE was analyzed by metallography microscopy, TEM and XRD, and the forming mechanism was also discussed. The results show tha...The coating microstructure of hot-dip aluminum (HDA) of deformed low-carbon steel containing RE was analyzed by metallography microscopy, TEM and XRD, and the forming mechanism was also discussed. The results show that, the Fe_2Al_5 phase, on whose subcrystal boundaries, Al particles with the size of 7～30 μm existing on parallel linear are, grows a strong orientation. And the spread activation energy of Al is 155.22 kJ·mol -1. In addition, the effects of deformation on coating microstructure of hot-dip aluminum and the function of RE were preliminarily analyzed.展开更多
针对大功率柴油发动机排气管的隔热层损伤问题,首先采用热浸镀技术在20钢基体表面制备了铝涂层,然后采用微弧氧化技术对铝涂层进行了氧化处理,形成了复合陶瓷涂层体系,并利用扫描电子显微镜(Scanning Electron Microscopy,SEM)、X射线...针对大功率柴油发动机排气管的隔热层损伤问题,首先采用热浸镀技术在20钢基体表面制备了铝涂层,然后采用微弧氧化技术对铝涂层进行了氧化处理,形成了复合陶瓷涂层体系,并利用扫描电子显微镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-Ray Diffraction,XRD)及DZDR-S导热仪对该涂层体系分别进行了表面形貌与组织结构观察、物相分析和热导率检测。结果表明:从宏观上,涂层表面较平整,无漏镀现象,微观上分布有大量微弧孔,但无微裂纹现象;从剖面来看,复合涂层从表至里分别由氧化铝陶瓷层、铝层和铁铝合金层组成;复合陶瓷层的主要物相组成为Al、α-Al2O3、Al86Fe14和Fe,其导热率可达20.06 W/(m·℃)。展开更多
文摘The coating microstructure of hot-dip aluminum (HDA) of deformed low-carbon steel containing RE was analyzed by metallography microscopy, TEM and XRD, and the forming mechanism was also discussed. The results show that, the Fe_2Al_5 phase, on whose subcrystal boundaries, Al particles with the size of 7～30 μm existing on parallel linear are, grows a strong orientation. And the spread activation energy of Al is 155.22 kJ·mol -1. In addition, the effects of deformation on coating microstructure of hot-dip aluminum and the function of RE were preliminarily analyzed.
文摘针对大功率柴油发动机排气管的隔热层损伤问题,首先采用热浸镀技术在20钢基体表面制备了铝涂层,然后采用微弧氧化技术对铝涂层进行了氧化处理,形成了复合陶瓷涂层体系,并利用扫描电子显微镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-Ray Diffraction,XRD)及DZDR-S导热仪对该涂层体系分别进行了表面形貌与组织结构观察、物相分析和热导率检测。结果表明:从宏观上,涂层表面较平整,无漏镀现象,微观上分布有大量微弧孔,但无微裂纹现象;从剖面来看,复合涂层从表至里分别由氧化铝陶瓷层、铝层和铁铝合金层组成;复合陶瓷层的主要物相组成为Al、α-Al2O3、Al86Fe14和Fe,其导热率可达20.06 W/(m·℃)。
