【摘要】 为提高奥氏体不锈钢（ASS）的耐磨性及赋予其抗菌性能，应用改进的活性屏离子渗氮（ASPN）技术，将纯铜冲孔板置于不锈钢冲孔板上面作为活性屏的顶盖，对316奥氏体不锈钢在低温下（430℃）进行表面渗氮处理，在其表面形成由含Cu抗菌沉积层和S相（氮在奥氏体中的过饱和固溶体γ_N）硬质支撑层组成的功能梯度复合改性层。用扫描电镜（SEM）及其所附能谱仪（EDS）、X射线衍射仪（XRD）表征复合改性层的组织形貌、成分及相结构。用显微硬度计和往复摩擦磨损试验机测试了基体和复合改性层的显微硬度和摩擦磨损性能，用金黄色葡萄球菌进行体外抗菌试验评价复合改性层的抗菌性能。结果表明，在偏压达到250 V后，形成了连续分布的硬质S相扩散层和含Cu沉积层组成的复合改性层。改性层表面最高硬度可达928 HV0.05,与Si₃N₄小球对磨时比磨损率较基体降低约57.76%,显著提高了不锈钢的耐磨性。抗菌试验表明，复合改性层与金黄色葡萄球菌接触24 h后，对金黄色葡萄球菌抗菌率提高到98.5%。改进的活性屏离子渗氮技术制备的功能梯度复合改性层可以有效提高不锈钢的耐磨性及抗菌性能。更多还原

【Abstract】 In order to improve the wear resistance and antibacterial property of stainless steel, a functional gradient composite modified layer was prepared on AISI316 stainless steel by a modified active screen plasma nitriding（ASPN） technology that the pure copper punching plate was placed on the stainless steel punching plate as top cover of the active screen. The surface nitriding treatment of the AISI316 stainless steel was carried out at low temperature（430 ℃）, and at the same time, a functional gradient composite modified coating consisting of Cu containing antibacterial deposition layer and S phase（supersaturated solid solution of nitrogen in austenite γ_N） hard support layer was formed on the surface. The microstructure, composition and phase structure of the composite modified coating were characterized by means of SEM, EDS, XRD. The microhardness and friction and wear properties of the substrate and composite modified layer were tested by microhardness tester and reciprocating friction and wear tester, and the antibacterial property was evacuated by antibacterial experiment in vitro using Staphylococcus aureus. The results show that when the bias voltage reaches 250 V, a composite modified coating composed of continuously distributed S phase diffusion layer and Cu containing deposition layer is formed. The maximum hardness of the modified coating reaches 928 HV0.05. When ground with Si₃N₄ small ball, the specific wear rate is about 57.76% lower than that of the substrate, which significantly improves the wear resistance of the stainless steel. The antibacterial test shows that the bactericidal rate of the composite modified coating reaches 98.5% after contacting with Staphylococcus aureus for 24 h. The functional gradient composite modified coating prepared by the improved active screen plasma nitriding technology can effectively improve the wear resistance and antibacterial property of the stainless steel.更多还原