扩散处理后的FeCrNi涂层结合强度与断口特征研究

对无底层和有NiCrAl底层的FeCrNi涂层进行扩散处理,之后使涂层在机械作用力下断裂,通过观察断面的SEM形貌,研究了涂层的断裂机制、涂层与基体间以及涂层内部颗粒间的结合状态,分析了扩散处理提高涂层结合强度的机理。涂层的断口基本上呈现出由暗色区域、白亮区域和未熔颗粒构成。暗色区域内断口面主要为层状剥离断裂;白亮区域内部含有滑移带和台阶面,断裂以脆性解理和塑性滑移混合方式进行。

Research on the Bonding Strength and Fracture Morphology of the Diffusion Treated FeCrNi Coating

After the FeCrNi coatings(with or without NiCrAl adhesive coating)were fractured by the mechanical force, which had been diffusion treated in advance, then the fracture mechanism, the bonding states between coating and substrate and the bonding states inter particles of coating were seriously studied by observing the section SEM morphology on the fracture, and the effect mechanisms of diffusion treatment on improving the bonding strength of coating were also discussed. The coating fracture surface mainly consists of gray area and bright area, layer peeled off brittle rupture, the bonding strength of this way is very lower; Instead, the bright area turns on plenty of"slip-band" and "step-face", with the way mixed with brittle cleavage and plastic slip together.