鸟喙状Ni-Fe仿生结构的水热法可控合成及其耐磨性能研究

Controllable Hydrothermal Synthesis of Bi-onic Beak-Like Structures and Their Wear Properties Study

摘要: 利用水热法在球墨铸铁表面制备了Ni-Fe复合涂层，并研究了涂层的耐磨性能。实验结果表明，通过水热反应在Ni-Fe复合涂层中有鸟喙状微观结构生成。经120℃水热反应及700℃后处理以后，鸟喙状结构原位增强Ni-Fe复合涂层的显微硬度为483 HV，是球墨铸铁基体硬度(262 HV)的1.8倍；在磨损实验中，Ni-Fe复合涂层的磨损失重明显低于球墨铸铁基体的磨损失重，显著提高了球墨铸铁基体的耐磨性能。水热反应中，微观结构择优生长方向的转换在涂层中形成鸟喙状微观结构；鸟喙状结构优异的载荷传递能力显著提高了Ni-Fe复合涂层的强韧性，使Ni-Fe复合涂层表现出优良的耐磨性能。

Abstract: Ni-Fe composite coating was synthesized on spheroidal graphite cast iron substrate by a hydro-thermal approach, and the wear properties of Ni-Fe coating were analyzed. The experimental re-sults demonstrated that beak-like structures were grown in Ni-Fe composite coating by hydro-thermal reactions. After 120˚C hydrothermal and subsequent 700˚C treatment, a high microhard-ness of 483 HV of beak-like structure in-situ reinforced Ni-Fe composite coating was achieved, about 1.8 times that of spheroidal graphite cast iron substrate (262 HV). During wear testing, the volume loss of Ni-Fe composite coating was obviously less than that of spheroidal graphite cast iron substrate, and the wear properties of spheroidal graphite cast iron were obviously increased. During hydrothermal reactions, the transformation of preferred growth directions of micostruc-tures resulted in beak-like structures. The excellent load transfer ability of beak-like structures greatly increased the strength and toughness of Ni-Fe composite coating so that Ni-Fe composite coating demonstrated good wear properties.