目的 研究氮化和喷涂MoS2涂层的异种不锈钢试样，经振动试验后的抗咬死性能及失效原因。方法 利用三角级数法转化得到了振动参数，对底座(Ⅰ型不锈钢)和拉杆(Ⅱ型不锈钢)的模拟件进行了气体氮化和常温喷涂MoS2涂层处理，采用三维显微镜、XRD、SEM、EDS和模拟振动试验平台对试样进行了表征。结果 Ⅰ型和Ⅱ型不锈钢氮化后的表面物相主要是γ′-Fe4N、ε-Fe2-3N和CrN。Ⅰ型不锈钢和Ⅱ型不锈钢表面的MoS2涂层厚度分别为30~40 μm、20~30 μm，氮化层的总厚度分别约为165、230 μm。在模拟振动平台上，底座与拉杆咬死失效时间在30~45 min之间。底座和拉杆的上、下接触面磨损较严重，内接触面发生了轻微磨损。拉杆的下接触面发生旋转，上接触面继续保持接触，上下接触面的摩擦力大于拉杆的重力，从而发生了咬死现象。结论 底座和拉杆局部表面粗糙度增加、拉杆直径比底座内表面高度方向尺寸大0.28 mm、互溶性大且含立方晶体结构氮化物的氮化层之间直接接触，是振动45 min并旋转后试样发生咬死的主要原因。建议改进底座和拉杆的尺寸、表面处理层和工艺参数。

The work aims to investigate the scuffing resistant properties and failure reasons of dissimilar stainless steel specimens treated by nitriding and spraying MoS2 coating after vibration. Vibration parameter was obtained by trigonometric series method. The simulation specimens of pedestal (Ⅰ type stainless steel) and tie bar (Ⅱ type stainless steel) were gas nitrided and sprayed MoS2 coatings. These specimens were studied by three dimensional microscope, XRD, SEM, EDS and simulation platform of vibration test. The phases of Ⅰ type and Ⅱ type stainless steel were γ′-Fe4N, ε-Fe2-3N and CrN. The thickness of MoS2 coatings of Ⅰ type and Ⅱ type stainless steel were 30~40 μm and 20~30 μm, the thickness of nitrided layers of Ⅰ type and Ⅱ type stainless steel were about 165 μm and 230 μm. On simulation platform of vibration test, pedestal and tie bar after nitriding and spraying MoS2 coating were scuffing when the vibration time was 30 min to 45 min. The upper and inferior interfaces were badly worn, and the inner inferior interface was mildly worn. The inferior interface of tie bar was rotating; upper interface kept contact, and the friction of inferior and upper interface was bigger than gravity of the bar, so the scuffing occurred. Surface roughness of parts of pedestal and tie bar is increasing, the diameter of tie bar is 0.28 mm larger than the distance between upper and inferior surface of pedestal, the nitriding layer of tie bar comes into contact with that of pedestal, and these nitrided layers have larger solubility and contain face-centered cubic nitride, so the failure of pedestal and tie bar occurs after vibration tests and rotation. Some suggestions for improvement of dimensions of pedestal and tie bar, surface treatment and process parameter are given.