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为改善烧结钕铁硼(NdFeB)磁体的耐腐蚀性能,在磁体表面用磁控溅射方法制备了Ni薄膜。利用扫描电子显微镜(SEM)观察了Ni薄膜的组织形貌,利用电化学测试、中性盐雾试验(NSS)测试了镀膜样品的耐腐蚀性能,研究了溅射功率和负偏压对Ni薄膜组织结构、电化学性能和中性盐雾环境下耐腐蚀性能的影响。结果表明:Ni薄膜的厚度和致密性是影响其耐腐蚀性能的关键因素;随溅射功率增大,Ni薄膜厚度增大,但晶粒尺寸变大、致密性降低,耐腐蚀性能先升高后降低;加负偏压后,Ni薄膜厚度有所减小,但膜层表面更加光滑、组织更加致密均匀,因此镀膜样品耐腐蚀性能有所提高;在溅射功率为100~120 W、负偏压为150 V条件下制备的磁控溅射镀Ni样品具有最好的耐腐蚀性能。 相似文献
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溅射沉积技术的发展及其现状 总被引:12,自引:4,他引:12
论述了溅射沉积薄膜技术的发展历程及其目前的研究应用状况.二极溅射应用于薄膜制备,揭开了溅射沉积技术的序幕,磁控溅射促使溅射沉积技术进入实质的工业化应用,并通过控制磁控靶磁场的分布方式和增加磁控靶数量,进一步发展为非平衡磁控溅射、多靶闭合式非平衡磁控溅射等,拓宽了应用范围.射频、脉冲电源尤其是脉冲电源在溅射技术中的使用极大地延伸了溅射沉积技术的应用范围. 相似文献
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在室温条件下采用磁控溅射技术在涤纶机织物表面沉积金属薄膜,利用扫描电镜(SEM)和原子力显微镜(AFM)观察纳米金属薄膜的表面形貌,通过分别改变磁控溅射工艺参数溅射时间、溅射功率和气体压强,研究其对试样抗静电性能的影响。实验结果表明,溅射时间和溅射功率对镀金属薄膜试样的抗静电性能均影响较大,而气体压强影响相对较小。溅射时间40min、溅射功率120W、气体压强1.6Pa工艺条件下,镀Cu膜试样的抗静电性能最好;溅射时间40min、溅射功率120W、气体压强1Pa或1.6Pa工艺条件下,镀Ag膜试样的抗静电性能最好,而且镀Ag比镀Cu薄膜试样的抗静电性能更优异。 相似文献
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以碳纤维毡为基材,优化了采用磁控溅射技术在其表面沉积纳米铜薄膜的工艺参数。运用正交试验分析方法,选取沉积时间、溅射功率和工作压强3个参数为因素,分析了各因素对碳纤维毡的电磁屏蔽效能和导电性能的影响。实验表明:磁控溅射铜薄膜后,碳纤维毡的电磁屏蔽效能提高了116.25%,导电性能提高了45.81%。;碳纤维毡表面溅射沉积铜薄膜的最佳工艺方案为:沉积时间50min,工作压强0.4Pa,溅射功率80W。 相似文献
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AZ31镁合金表面磁控溅射Zr(Al,Ti)-SiN_x复合薄膜及其耐蚀性能 总被引:1,自引:0,他引:1
镁合金表面沉积薄膜可以提高其耐蚀性,但现有的几种沉积方法得到的膜疏松、与基体结合力差,影响了其耐腐蚀性能.为此,采用磁控溅射法在AZ31镁合金表面制备了Al,Zr,Ti膜及其与SiN_x的复合薄膜.用扫描电镜、X射线衍射、XPS研究了金属膜及其与SiNi_x复合薄膜的晶体结构、表面形貌和化学成分.结果表明:所制备的SiN_x薄膜为非晶态的富N膜;Zr膜的耐腐蚀性最好,Al膜的保护性最差;Zr-SiN_x复合薄膜比AZ31镁合金的腐蚀电流密度降低了3个数量级,Ti-SiN_x复合薄膜在阳极极化区出现了钝化.SiN_x复合薄膜的耐腐蚀性优于AZ31镁合金和单一金属膜. 相似文献
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Preparation of titanium film on magnesium substrate faces a challenge due to non-Fickian inter-diffusion between titanium and magnesium. Aluminum can build a bridge between titanium and magnesium. Al/Ti duplex coatings were deposited on magnesium alloy AZ31B using magnetron sputtering (MS). The low temperature diffusion bonding behavior of the Mg/Al/Ti coating was investigated through SEM and its affiliated EDS. The phase structure and critical load of the coatings were examined by means of XRD and scratch tests, respectively. The results demonstrated that the bonding strength was significantly improved after a post heat treatment (HT) at a temperature of 210°C. The diffusion mechanism of the interfaces of Mg/Al and Al/Ti in the coating was discussed based on the analysis of formation energy of vacancies and diffusion rates. The Al/Ti dual layer enhanced the corrosion resistance of the alloy. And the HT process further increased the corrosion resistance of the coated alloy. This result implies that a post HT at a lower temperature after MS is an effective approach to enhance the bonding strength and corrosion resistance of the Al/Ti film on Mg alloys. 相似文献
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《Materials Characterization》2007,58(10):917-921
In this study, AlN/TiN was coated on magnesium alloys using physical vapour deposition (PVD) technique of DC magnetron sputtering, and the influence of the coating on the wear behaviour of the alloys was examined. A physical vapour deposition system for coating processes, a reciprocating wear system for wear tests, a universal hardness equipment for hardness measurement, a X-ray diffractometer (XRD) for compositional analysis of the coating, and a scanning electron microscopy (SEM) for surface examinations were used. It was determined that the wear resistance of the magnesium alloys can be increased by PVD coatings. However, small structural defects which could arise from the coating process or substrate were observed in the coating layers. 相似文献
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To improve the wear and corrosion resistance of AZ91D magnesium alloy, Zr-based coating made of Zr powder was fabricated on AZ91D magnesium alloy by laser cladding. The microstructure of the coating was characterized by XRD, SEM and TEM techniques. The wear resistance of the coating was evaluated under dry sliding wear test condition at room temperature. The corrosion resistance of the coating was tested in simulated body fluid. The results show that the coating mainly consists of Zr, zirconium oxides and Zr aluminides. The coating exhibits excellent wear resistance due to the high microhardness of the coating. The main wear mechanism of the coating and the AZ91D sample are different, the former is abrasive wear and the latter is adhesive wear. The coating compared to AZ91D magnesium alloy exhibits good corrosion resistance because of the good corrosion resistance of Zr, zirconium oxides and Zr aluminides in the coating. 相似文献
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AZ31镁合金基材非平衡磁控溅射镀膜工艺研究 总被引:1,自引:0,他引:1
采用中频孪生靶非平衡磁控溅射技术在AZ31镁合金基底上制备出氮化硅薄膜。利用傅里叶变换红外光谱仪、电子探针、X射线衍射仪等研究了氮气流量比率对氮化硅薄膜的成分、微观结构的影响。通过对薄膜力学性能和抗腐蚀性能的检测分析了氮化硅薄膜对AZ31镁合金基底表面改性的作用。结果表明:中频孪生非平衡磁控溅射技术制备的薄膜为非晶态富N氮化硅。随着氮气流量比率的增加,薄膜的沉积速率降低,Si含量减少。在AZ31镁合金基底上制备氮化硅薄膜有效提高了基底的力学性能和抗腐蚀性能,显微硬度得到显著提高,腐蚀电流密度降低了3个数量级,并且薄膜与基底之间的结合力良好。 相似文献
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In this study, multilayered AlN (AlN + AlN + AlN) and AlN + TiN were coated on AZ91 magnesium alloy using physical vapour deposition (PVD) technique of DC magnetron sputtering, and the influence of the coatings on the corrosion behaviour of the AZ91 alloy was examined. A PVD system for coating processes, a potentiostat for electrochemical corrosion tests, X-ray difractometer for compositional analysis of the coatings, and scanning electron microscopy for surface examinations were used. It was determined that PVD coatings deposited on AZ91 magnesium alloy increased the corrosion resistance of the alloy, and AlN + AlN + AlN coating increased the corrosion resistance much more than AlN + TiN coating. However, it was observed that, in the coating layers, small structural defects e.g., pores, pinholes, cracks that could arise from the coating process or substrate and get the ability of protection from corrosion worsened were present. 相似文献
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Hongwei HUO Ying LI Fuhui WANG 《材料科学技术学报》2007,23(3):379-382
By combination of magnetron sputtering deposition and vacuum annealing, an aluminum diffusion coating was prepared on the substrate of AZ91D alloy to improve its corrosion resistance. The microstructure and composition of the diffusion coating was investigated by scanning electron microscopy and X-ray diffraction. The diffusion coating was mainly comprised of β phase-Al12Mg17. The continuous immersion test in 3.5 wt pct neutral NaCl solution indicated that the specimen with diffusion coating had better corrosion resistance compared with the bare AZ91D alloy specimen. The potentiodynamic polarization measurement indicated that the diffusion coating could function as an effectively protective layer to reduce the corrosion rate of AZ91D alloy when exposed to 3.5 wt pct NaCl solution. 相似文献
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