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采用低温离子渗硫工艺,在CrMoCu合金铸铁表面渗硫,利用SEM、TEM、EDS及XRD等分析技术,对渗硫层表面和截面的微观结构进行系统分析,进一步探讨渗硫层的形成机理。结果表明,渗硫层表面由200～300 nm均匀的硫化物小颗粒组成,并含有α-Fe、Fe1-xS及FeS相,渗硫层的硫含量由表及里逐渐减少。通过TEM电子衍射花样分析,发现渗硫层存在FeS非晶相,并分析了其产生的原因。
The microstructure of the surface and cross section of the sulphide layer was systematically analyzed by SEM, TEM, EDS and XRD, and the formation mechanism of the sulphide layer was further discussed. The results show that the surface of the sulfurized layer is composed of small particles of sulfide with a uniform size of 200-300 nm and contains α-Fe, Fe1-xS and FeS phases. The sulfur content of the sulfurized layer decreases gradually from the surface to the surface. Through the TEM electron diffraction pattern analysis, it is found that there exists FeS amorphous phase in the sulfurized layer, and the reason of its occurrence is analyzed.