表面双重改性304钢干摩擦特性研究

Study on Dry Friction Characteristics of Double Surface Modified 304 Steel

为了改善304钢的干滑动摩擦学性能,采用激光打标机在304钢基体表面刻蚀出直径及间距为300μm的点坑状织构,之后对织构前后试样表面进行盐浴渗氮处理。分别采用D/MAX-Ultima+型X射线衍射仪、3D形貌仪、开尔文探针及Fisherscope型显微硬度测试仪对复合改性表面的化学成分、表面形貌、表面电子功函数及表面显微硬度进行了检测。采用CSEM旋转摩擦磨损试验机测试3种试样的摩擦学性能,试验条件为干摩擦。试验结果表明:盐浴渗氮处理后表面的显微硬度大大高于304钢基体表面,渗氮表面功函数明显高于304钢基体表面。渗氮光滑表面的抗磨性能显著优于304钢基体表面,而复合改性表面又明显优于渗氮光滑表面,说明复合改性表面具有极为优异的抗磨特性。

In order to improve the dry friction performance of 304 steel,a dot pit texture with diameter and spacing of 300μm on the surface of 304 steel was prepared by using laser device.Subsequently,the textured surface was nitriding treated by using nitriding salt bath device.The chemical composition,surface morphology,surface electronic work function and surface microhardness were measured by X-ray diffractometer,3 D topography instrument,Kelvin probe force microscopy and surface micro-hardness tester.In addition,the friction and wear properties of three samples were detected by CSEM type rotary friction and wear testing machine under the experimental conditions of dry friction.Results showed that the micro-hardness of nitriding treatment surface was significantly higher than the substrate of 304 steel,and the surface electronic work function was also higher than that of 304 steel.Furthermore,the anti-wear property of the nitriding smooth surface was significantly better than that of 304 steel,and the compound modification surface had significantly better anti-wear property than the nitriding smooth surface,which indicated that the composite modified surface possessed excellent anti-wear properties.