测定膜基界面结合能的努氏印痕能量法

Interfacial bonding energy between coating and substrate for low-pressure plasma sprayed materials

研究了涂层与基体界面结合能的测定方法 ,用理论和实验技术分析了努氏界面印痕法加载过程中 ,膜基试样吸收外加能量而转化为塑性变形能的行为、以及表面形状改变能和涂层界面断裂表面能 ,建立了努氏界面印痕能量法。对铁基Ni/Fe、镍基Cu/Ni低压等离子喷涂涂层进行界面结合强度的研究和分析得到涂层界面的断裂表面能。铁基纯镍Ni/Fe涂层界面的断裂表面能比镍基铜Cu/Ni涂层的高。界面微观分析表明 :镍基铜Cu/Ni涂层材料疏松 ,膜基界面存在较多裂纹 ,涂层和基体中观察不到元素扩散层。Ni/Fe涂层界面结合致密 ,约有 2μm的元素扩散层 。

The Interfacial bonding energy between coating and substrate for low plasma sprayed materials was analyzed by theory and experiment. The plastic deformation energy, superficies modification energy and interfacial fracture surface energy consumed by samples during interfacial indentation experiment were determined by Knoop interfacial indentation method. Knoop interfacial indentation energy testing method was newly established. The interfacial fracture surface energy was obtained through research on interfacial bonding energy between coating and substrate for low plasma sprayed Fe based Ni/Fe and Cu based Cu/Ni materials. Microanalysis for interface shows that the coating of Ni based Cu/Ni material is porous and there exist many cracks at the interface between coating and substrate, moreover, no element diffusion layer is found in the coating and substrate. The bonding between the coating and substrate for Ni/Fe material is dense and there is an element diffusion layer with the thickness of about 2～3?μm.