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To solve the problems with coronary stent implantation, coronary artery stent surface was directly modified by three-beam laser interference lithography through imitating the water-repellent surface of lotus leaf, and uniform micro-nano structures with the controllable period were fabricated. The morphological properties and contact angle (CA) of the microstructure were measured by scanning electron microscope (SEM) and CA system. The water repellency of stent was also evaluated by the contact and then separation between the water drop and the stent. The results show that the close-packed concave structure with the period of about 12 μm can be fabricated on the stent surface with special parameters (incident angle of 3°, laser energy density of 2.2 J?cm-2 and exposure time of 80 s) by using the three-beam laser at 1 064 nm, and the structure has good water repellency with CA of 120°. 相似文献
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Ni35粉末掺杂不同质量分数(0%、25%、50%、75%、100%)高碳铬铁粉末,在27SiMn钢表面进行激光熔覆制备复合涂层。采用OM、SEM、EDS及XRD等手段,表征熔覆层显微组织及物相结构;利用硬度计、磨粒磨损机及电化学工作站等仪器,表征熔覆层力学及腐蚀性能。结果表明:未掺杂时,熔覆层物相主要有γ-Ni、FeNi_3及Cr_2Ni_3,掺杂量为50%时,熔覆层物相有α-Cr和(Cr,Fe)_7C_3生成,同时Cr_2Ni_3相消失;随着掺杂量增加,熔覆层中部板条状组织增多且形貌变得粗大;掺杂量为50%时,熔覆层上部花瓣状组织及中部板条状组织均出现Cr元素富集现象,浅灰色组织为γ-Ni。随着掺杂量增加,熔覆层显微硬度呈上升趋势,磨损率呈下降趋势;掺杂量为25%时,稀释率最大,为20.80%;掺杂量为50%时,熔覆层耐蚀性最佳,腐蚀电流密度最小,约为0.39μA/cm~2。 相似文献
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