等离子喷涂制备铁基非晶-纳米复合涂层

以一种多元素铁基非晶合金粉末(含C,Si,B,Cr,W,Mo,Ni,Fe等)作为喷涂材料,用大气等离子喷涂在316L不锈钢基体上制备涂层.用X射线衍射仪检测涂层的晶型结构,扫描电镜观察涂层的形貌,透射电镜观察涂层的微观组织结构,显微硬度仪测量涂层的显微硬度,纳米压痕仪测量涂层的硬度及弹性模量,并用谢乐公式计算了晶粒尺寸.结果表明:所制备的涂层均匀致密,与基体结合良好;涂层含有非晶和纳米颗粒;这种非晶-纳米复合涂层具有很高的硬度和弹性模量.

Preparation of iron base amorphous and nanocrystalline alloy coatings by plasma spraying

The coating was prepared on 316L stainless steel by air plasma spraying with a kind of iron base amorphous alloy powder which contains C, Si, B, Cr, W, Mo, Ni, Fe etc. as the plasma spraying powder. The crystal configuration of the coating was inspected with an X-ray diffractometer, the microstructure observed by SEM and TEM, the hardness and elastic modulus measured with a micro-sclerometer and a triboindenter; and the size ofcry- stallites in the coating calculated by Scherrer's equation. It is proved that the Fe-base alloy coating fabricated by air plasma spraying has homogenous microstructure and contains metal glass and nanocrystal at the same time. The experimental results show that the coating is uniform, dense and well combined with 316L stainless steel, with high hardness and elastic modulus.