利用SMAT和SPS在纯铁表面制备铁镍合金层

Preparation of Iron-nickel Alloy Layer on Surface of Pure Iron by SMAT+SPS

利用放电等离子烧结(SPS)技术实现了镍粉在纯铁表面铁镍合金层的制备,通过纯铁表面机械研磨(SMAT)的预处理获得表面纳米层和梯度结构有效促进了铁镍的扩散,提升了合金层厚度和结合强度。通过XRD、SEM、EDS、硬度和摩擦磨损实验等,表征铁镍合金层形貌、组成,测试了力学性能。结果表明:纯铁试样经过SMAT预处理和SPS后,在表面获得了约50μm的铁镍合金层,沿着深度方向镍元素含量梯度变化,而在未经SMAT预处理的纯铁表面仅有25μm的合金层,本方法实现了合金层厚度明显增加。SMAT预处理后的SPS试样硬度提升,表面磨损量和犁沟槽深度减少,结合力增强,耐磨性提升明显。

The spark plasma sintering(SPS)technology was used to realize the preparation of the iron-nickel alloy layer on the surface of pure iron with nickel powder paving on the iron surface.The surface nano-layer and graded structure obtained by the pre-surface mechanical attrition treatment(pre-SMAT)on the pure iron surface effectively promotes the diffusion of iron and nickel during SPS,and the thickness and bonding strength of the alloy layer improves.By XRD,SEM,EDS,hardness,and friction and wear tests,the morphologies and composition were characterized,and the mechanical properties of the iron-nickel alloy layer were tested.The results show that after SMAT+SPS,an iron-nickel alloy layer with the thickness of about 50μm on the pure iron sample has been prepared.And in the depth direction,the nickel content shows a gradient change.However,the alloy layer depth on the surface of pure iron without SMAT pretreatment is just 25μm.Therefore,the method can achieve a significant increase in the thickness of the alloy layer.After SMAT pretreatment,the hardness of the surface alloy layer increases,the wear mass loss of surface and the depth of the plough groove reduce.The bonding strength increases.The wear resistance obviously improves.