铝热合成FeNiCr/NiAl-TiC涂层的时效研究

用铝热反应合成工艺在钢管内表面制备出了FeNiCr/NiAl-TiC复合涂层.用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)和透射电子显微镜(TEM)等分析手段研究了涂层显微结构以及固溶时效对FeNiCr/NiAl-TiC涂层显微结构的影响.研究表明,FeNiCr/NiAl-TiC复合涂层由TiC,NiAl,α-FeNiCr三相组成,晶粒细小,合金基体由α-FeNiCr和NiAl两相组成,其中NiAl相尺寸约为100nm.经过固溶时效,物相组成不变,TiC形态和尺寸稳定,α-FeNiCr基体中NiAl相的尺寸约为400nm,时效后NiAl和α-FeNiCr仍保持共格关系. 

Aging treatment of FeNiCr/NiAl-TiC composite coatings produced by thermit process

The FeNiCr/NiAl-TiC composite coatings were prepared by thermit reaction process in a carbon steel pipe. Using scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and energy dispersive spectrum (EDS), the microstructure of the composite coatings and effects of aging treatment on the microstructure were investigated. Results show that the FeNiCr/NiAl-TiC composite coatings are composed of titanium carbide (TiC), intermetallic compound NiAl and ferrite (α-FeNiCr). The alloy matrix consists of NiAl and α-FeNiCr in which the grain size of the NiAl is about 100nm. After aging treatment, the phase constituent of the coatings doesn-t change. The shape and size of TiC particle are stable. The grain size of NiAl phase is about 400nm and it is coherent with the ferrite matrix.