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1.
Load Dependence of Nanohardness in Nitrogen Ion Implanted Ti6Al4V Alloy and Fractal Characterization 总被引:1,自引:1,他引:1
Three different nitrogen ion doses were implanted into a Ti6Al4V alloy to improve its mechanical surface properties for the application of artificial joints. The titanium nitride phase and nitrogen element distribution profile were characterized with X-ray photoelectron spectroscopy (XPS). Nano-indentation tests were carried out on the surface of the Ti6Al4V alloy and implanted samples on a large scale of applied loads. The XPS analysis results indicate that nitrogen diffuses into the titanium alloy and forms a hard TiN layer on the Ti6Al4V alloy. The nanohardness results reveal that nitrogen ion implantation effectively enhances the surface hardness of Ti6Al4V. In addition, the nanohardness clearly reveals load dependence over a large segment of the applied loads. Thus a concept of nanohardness fractal dimension is first proposed and the dual fractal model can effectively describe nonlinear deformation in indentation areas on the Ti6Al4V surface. The fractal dimension shows a decreased trend in two regions of applied loads, indicating a decrease of the self-similarity complexity in surface indentation owing to an increase in nanohardness after nitrogen ion implantation. 相似文献
2.
The nitrided layer on Ti6A14V substrate was prepared by the plasma nitriding technique. The sample was characterized by X-ray diffraction (XRD), glow discharge optical emission spectroscopy (GDOES), X-ray photoelectron spectroscopy (XPS), and rough-meter. X- ray diffraction analysis reveals that TiN, Ti2N and Ti phase exist in the nitrided layer subsurface. GDOES analysis shows the thickness of the nitrided layer is about 3 ~tm. XPS analysis shows that there is higher N, lower A1 and lower V in the nitrided layer surface than in the Ti6A14V surface. Rough-meter analysis results show the roughness of the nitrided layer is greater than that of Ti6A14V alloy base. The bacteria adherence property of the nitrided layer on Ti6A14V substrate on the Streptococcus mutans was investigated and compared with that of Ti6A14V alloy by fluorescence microscope. It shows that the nitrided layer inhibits the bacteria adherence. 相似文献
3.
铝合金等离子体基离子注入氮/钛改性层成分分布 总被引:2,自引:0,他引:2
用X射线光电子能谱(XPS)研究了工艺参数(注入电压或能量、注入时间或剂量、磁控靶溅射电流)对铝合金LY12(即2024)等离子体基离子注入氮 离子注入钛形成的改性层成分分布影响。结果表明,氮在注入层呈高斯分布,而钛沿注入方向逐渐减少。钛的注入使已注入的氮的分布有所拓宽。随着注入电压和时间的增加,钛的注入深度及含量有所增加;存在一个注入时间或/和磁控靶溅射电流阈值,在低于该值下注入钛主要表现为注入效应,没有钛沉积层出现,在高于该值下注入钛由注入效应逐渐表面为沉积效应,有明显的钛层出现。 相似文献
4.
Titanium alloy(Ti6Al4V)surfaces are generally modified to achieve some specific surface properties to satisfy requirements of clinical medicine.In our work,hexadecylphosphonic acid(HDPA)films were successfully formed on Ti6Al4V and subsequently confirmed by X-ray photoelectron spectroscopy(XPS)and atomic force microscopy(AFM)measurements.The tribological properties of the HDPA-modified Ti6Al4V were investigated using a ball-on-disk tribometer with a linear reciprocating movement.Experimental results indicate that the HDPA-modified Ti6Al4V can maintain a low friction coefficient(approximately 0.06)for 4 h when sliding against polytetrafluoroethylene(PTFE)balls under a load of 0.8 N in comparison to bare Ti6Al4V(approximately 0.2);the friction coefficient of the HDPA-modified Ti6Al4V shows a 70%decline.In addition,the wear rate of PTFE balls sliding against bare Ti6Al4V was almost twenty times that of PTFE balls sliding against the HDPA-modified Ti6Al4V.Moreover,results of tribological experiments for different speeds(from 3 to 24 mm/s)and loads(from 0.8 to 3.2 N)proved that the HDPA-modified Ti6Al4V was not sensitive to both velocity and load.The friction coefficients were still low and stable even under a high load of 3.2 N or at a high speed of 24 mm/s.This indicates that this soft modification is an optional method of improving tribological properties of Ti6Al4V. 相似文献
5.
研究了强流脉冲离子束辐照钛合金Ti6A l4V样品后的表面形貌、显微硬度和表面相结构的变化。随着辐照次数的增加,钛合金表面的熔坑尺寸逐渐增大、密度减小。表面硬度呈现上升-下降-上升的趋势,XRD的结果表明其变化是由于表面宏观应力和表面晶粒的细化等变化引起的. 相似文献
6.
静电冷却技术对钛合金摩擦磨损性能的影响 总被引:1,自引:0,他引:1
为了更好地将静电冷却技术应用到钛合金的车削中,在自行设计的高速摩擦磨损试验装置上,进行了YG8/Ti6A14V摩擦副的摩擦磨损试验.结果表明:静电冷却技术可以有效地降低YG8/Ti6A14V摩擦副间的摩擦系数,在抑制摩擦副磨损的同时还可以改善Ti6A14V磨损表面质量.扫描电镜分析表明,硬质合金高速摩擦时的磨损机理以粘... 相似文献
7.
The Mo-N surface modified layer on Ti6Al4V alloy was obtained by the plasma surface alloying technique. The structure and composition of the Mo-N modified Ti6Al4V alloy were investigated by X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GDOES). The Mo-N modified layer contains Mo-N coating on subsurface and diffusion layers between the subsurface and substrate. The X- ray diffraction analysis of the Mo-N modified Ti6Al4V alloy reveals that the outmost surface of the Mo-N modified Ti6Al4V alloy is composed of phase Mo2N (fcc) and Mo2N (tetr). The electrochemical corrosion performance of the Mo-N modified Ti6Al4V alloy in 0.5 mol/L HCl solution was investigated and compared with that of Ti6Al4V alloy. The chemical corrosion performance of the Mo-N modified Ti6Al4V alloy in boiling 37% HCl solution was investigated and compared with that of Ti6Al4V alloy. Results indicate that self-corroding electric potentials and corrosion-rate of the Mo-N modified Ti6Al4V alloy are higher than that of Ti6Al4V alloy in 0.5 mol/L HCl solution. The corrosion-rate of the Mo-N modified Ti6Al4V alloy is lower than that of Ti6Al4V alloy in boiling 37% HCl solution. 相似文献
8.
针对钛合金干式磨削特点,制备了金刚石和立方氮化硼(cubic boron nitride, CBN)超硬磨料砂轮,进行了与碳化硅陶瓷砂轮干式磨削Ti6Al4V合金的对比试验研究。用扫描电子显微镜、三维体视显微镜、粗糙度仪和显微硬度计对磨削工况和试样表面进行了测定。分析了磨削用量对表面粗糙度的影响,比较了3种砂轮磨削工件的表面粗糙度、表面形貌、微观组织及显微硬度。研究表明:工件表面粗糙度随着磨削深度增大而增大,随着砂轮速度的增大而减小。与绿色碳化硅陶瓷结合剂砂轮相比,CBN和金刚石超硬磨料砂轮磨削工件的表面粗糙度和变质层深度较小,表面无明显烧伤,在一定用量条件下更适合Ti6Al4V合金干式磨削加工。 相似文献
9.
Ti6Al4V合金表面纳米管阵列的制备 总被引:1,自引:0,他引:1
以氢氟酸和铬酸为电解液,采用阳极氧化法在Ti6Al4V合金表面制备高密度的纳米管阵列.利用场发射扫描电镜、X射线衍射仪和X射线光电子能谱对多孔氧化膜的形貌和结构进行分析,利用极化曲线和电化学阻抗谱研究了电解液中CrO3的作用机理.结果表明:电解液种类决定能否形成多孔氧化膜,而电解液的浓度影响多孔氧化膜的形貌和孔径大小;纳米管阵列氧化膜主要由大部分非晶态组织的TiO2,Al2O3和少部分晶态的Al2TiO5,Al3Ti5O2,Al2O3组成,氧化膜内的Al,Ti原子比高于基体中的Al,Ti原子比;CrO3浓度的高低会影响氧化膜的结构. 相似文献
10.
A new method for determining the fractal dimension by STM at nanomeler scale has been proposed.Widerstrass- Mandelbrot fractal curves were used to verify the accuracy and reliability. The Computer simulation showed that fractal dimen- sion obtained with this method generally outran the traditional yard method. The new method has been applied to the fractal dimension determination of the fractures of Ti3Al and Ti-24Al-11Nb alloys. The results show that the fractal dimension of Ti-24Al-11Nb alloy is higher than that of Ti3Al, and it varies with the crark extending orientation. 相似文献
11.
为了正确模拟钛合金Ti6Al4V高速切削过程中锯齿状切屑形成的过程,深入研究有限元建模过程中有限元模型的建立、材料本构关系、切屑分离准则、材料失效准则、切削热动态耗散与热传导等关键技术.结合实例,分别采用热力耦合分析和绝热分析对钛合金Ti6Al4V的加工过程进行正交切削有限元模拟.通过对2种模型获得的应力分布、温度分布、切削力曲线进行分析,以及将2种模型获得的锯齿状切屑与实际切屑形状进行对比,证明了绝热剪切是导致高速切削钛合金生成锯齿状切屑的原因. 相似文献
12.
WANG Xiao-hong SUN Zhi ZHU Xin WANG Zhen-zhong 《中国矿业大学学报(英文版)》2006,16(3):261-265
A matrix of 96 Al2O3 ceramics was implanted with Ni ion of different dosages and energies using a MEVVA implanter. Then metallic structures of copper were made on the implanted ceramics, by using selective electroless copper plating. In addition, the characteristics and microstructure of the implanted layer were studied by using the SEM, RBS and XPS. The results show that: 1) the implanted Ni exits as Ni^2, Ni^2+, and Ni^3+ in the surface of Al2O3 and metal Ni particles precipitate on ceramics during implantation; 2) the concentration of Ni submits to the Gauss distribution along the direction of implantation on the surface of Al2O3 and high Ni concentration on the surface can be obtained if the Ni is implanted with low energy and a high dosage and 3) Ni ion implantation can activate the surface of Al2O3 and induce electroless copper plating on the ceramics. 相似文献
13.
钛合金表面激光气体氮化及其HA复合涂层的制备 总被引:1,自引:0,他引:1
针对医用钛合金在临床应用中易出现耐磨性差、有毒合金元素溶解引起生理病变等问题,采用化学反应法在医用Ti6Al4V合金基材及其激光氮化改性层表面制备羟基磷灰石(HA)涂层.采用扫描电子显微镜(SEM)、能谱仪(EDAX)对改性层的组织形貌及成分进行分析.结果表明,钛合金表面经过酸碱及生物活性预钙化处理,其沉积类骨磷灰石能力明显增强,经过激光氮化改性的钛合金沉积速率及沉积效果均优于Ti6Al4V基体合金.试验证明,激光氮化改性可改善钛合金的生物相容性. 相似文献
14.
Friction and Wear Behaviors of Ti/Cu/N Coatings on Titanium Alloy Surface by DC Magnetron Sputtering
《武汉理工大学学报(材料科学英文版)》2017,(1)
Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique.XPS and FESEM were employed to characterize the composition and structure of the coating on the Ti6A14 V substrates.In addition,The adhesion force,friction,and wear properties of the Ti/Cu/N coatings were investigated.The experimental results showed that the coarse particles of the coatings would grow more and the surface roughness increased with the increase of copper content in the coatings;The coatings showed a strong adhesion force;The friction coefficient of the coating of the samples was less than the substrate,reaching 0.19 at least.The wear resistance of the coatings could be improved by optimizing and controlling the relative content of Ti,Cu,N elements on the titanium alloy surface,especially the 10.98 at%contents of the copper.The sample C2 kept the best wear resistance. 相似文献
15.
采用电化学沉积的方法在钛合金(Ti-6Al-4V)表面制备生物涂层.通过采用恒电流模式和脉冲电源模式考察不同的电源模式对电沉积磷酸钙涂层的影响.试验研究了不同电源模式对涂层的微观形貌及涂层厚度的影响.结果表明:脉冲电流下制备的涂层比恒电流条件下制备的涂层更为均匀致密.在同等的沉积条件下。脉冲电流制备的涂层厚度比恒电流条件制备的涂层厚度增加了16.2μm.XPD分析表明,电源模式的改变并没有影响磷酸钙的生成. 相似文献
16.
采用直流稳压电源,选用3种不同PH值的碱性微弧氧化电解液,在Ti6Al4V钛合金表面制备微弧氧化膜层;应用扫描电子显微镜分析微弧氧化膜层形貌特征。结果表明,钛合金微弧氧化膜层表面凹凸不平,带有微米级和亚微米级的孔洞,孔洞周围呈现火山丘状形貌特征;微弧氧化电解液PH值越大,火花放电时间越长;在给定电压条件下,电解液PH值越大,微弧氧化膜层厚度越大。 相似文献
17.
To protect the surface of NiTi from corrosion, an ion implantation method was proposed. In the present work, a surface oxidized sample was implanted with nitrogen at energy of 100 keV. The corrosion resistarwe property was examined by the anodic polarization method in a simulated body fluid (SBF) at a temperature of 37 ℃ and contrasted to non-implanted NiTi samples. The composition and structure of the implanted layers were investigated by XPS. The experimental results from the electrochemical measurements provide an evidence that the nitrogen ion-implantation increases the corrosion resistance of NiTi shape memory alloy. 相似文献
18.
为解决当前传统钛合金的切割加工过程只考虑单一性能,导致加工功能较差的问题,以Ti6Al4V合金为研究对象,研究切削进给速度、刀具前角角度等对切屑尺寸及形貌的影响.设定不同的切削速度、进给速度和刀具前角度,对锯齿金相的齿距、自由表面、带倾角以及带宽进行测量,根据测量结果分析切削工艺参数对Ti6Al4V合金切屑形貌的影响规律.结果表明:随着进给速度的增加,锯齿间距和自由表面尺寸增加显著,剪切带倾角随着切削厚度的增大而减小;当刀具前角为0°时,剪切带倾角从63. 21°降至50. 80°,刀具前角为8°时,剪切带倾角从68. 93°降至最低时为49. 8°,刀具前角的变化对剪切带倾角的影响不大. 相似文献
19.
Dequan Peng Xinde Bai and Baoshan Chen Department of Materials Science Engineering Tsinghua University Beijing China Jianzhong Chemical Corperation Yibin China 《北京科技大学学报(英文版)》2006,13(2):158-163
1. IntroductionZIRLO alloy is widely used in the nuclear industrybecause of its low thermal neutron capture cross sec-tion, favorable mechanical properties, and good corro-sion resistance. For example, ZIRLO alloy can serve asfuel cladding, spreaders for … 相似文献
20.
通过热模拟实验研究易切削材料1215钢和难切削材料Ti6Al4V合金的动态应力应变行为,讨论易切削材料和难切削材料动态形变行为的差异及其原因,分析切削过程中2种材料的形变再结晶行为。结果表明:1215钢在高温低应变速率条件下,可以诱发动态再结晶过程,出现明显的软化;对于Ti6Al4V合金,在Zener-Hollomon参数(Z参数)较小时,没有出现明显的软化,相反在高应变速率下出现了软化,这种现象难以用动态再结晶理论来解释。 相似文献