【摘要】 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-FeNi-Cr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400nm,时效后NiAl和α-FeNiCr仍保持共格关系.更多还原

【Abstract】 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 100nm.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 400nm and it is coherent with the ferrite matrix.更多还原