多弧离子镀(Ti,W)xN合金涂层组织与性能

采用Ti/W复合靶用多弧离子镀技术沉积了(Ti,W)xN合金涂层,并对该涂层的组织与性能进行了研究.结果表明,涂层组织致密,孔隙率极低,主要结构为(Ti,W)2N,并具有较高的显微硬度和抗氧化性.在沉积过程中存在着多元合金涂层与复合靶的成分离析现象,这与靶材的结构有关.     

真空电弧沉积多元膜复合靶成分离析效应的研究

用Ti/Mo ,Ti/W和Ti/Me(Me为Fe Cr Al合金 )复合靶采用真空电弧技术沉积了多元膜 ,并对成分离析效应及组织和性能进行了研究。结果表明 ,工作弧电流和阴极镶嵌体的弧斑平均电流对成分离析效应影响程度较大 ,Ti/Me复合靶存在一个无成分离析效应的平衡点。多元膜结构主要为组元原子固溶于Ti2 N中的结构形式 ,并具有较高的显微硬度     

射频反应溅射(Al,Ti)N涂层的微结构与力学性能

采用Al-Ti镶嵌复合靶在不同氮分压下制备了一系列(Al,Ti)N涂层,并采用EDS,AFM,XRD,TEM和微力学探针表征了涂层的沉积速率、化学成分、微结构和力学性能,研究了氮分压对涂层的影响.结果表明,氮分压对(Al,Ti)N涂层影响显著:合适的氮分压可以得到化学计量比的(Al,Ti)N涂层,涂层为单相组织,并呈现(111)择优取向,最高硬度和弹性模量分别达到36.9GPa和476GPa.过低的氮分压不但会造成涂层贫氮,而且涂层中的Al含量偏低,硬度不高.氮分压过高,由于存在"靶中毒"现象,尽管涂层的成分无明显变化,但会大大降低其沉积速率,并使涂层形成纳米晶或非晶态结构,涂层的硬度也较低.     

Ti-Mo-N三元多层膜的结构与性能

采用 Ti/ Mo复合靶 ,用多弧离子镀技术沉积了 Ti-Mo-N多元多层膜 ,并对其组织结构与性能进行了研究。结果表明 :在本试验条件下多元膜的结构形式为 (Ti,Mo) 2 N,最佳多层膜的结构形式为基体 / Ti/ Ti N/ (Tiy Mo1-y) N/ (Ti,Mo) 2 N,并具有较高的显微硬度、耐磨性和极低的孔隙率 ,在 80 0℃具有很好的抗氧化性能。在沉积过程中存在着多元合金膜层与复合靶的成分离析现象 ,这与靶材的结构有关。     

Ti60合金和表面Ni-Co-Cr-Al-Y-Si涂层氧化动力学的研究

研究了Ti60合金及表面阴极多弧离子镀沉积涂层(Ni-Co-Cr-Al-Y-Si)的600~750℃的高温氧化行为。采用X射线衍射、扫描电子显微镜等方法,对Ti60合金及涂层表面形貌、结构和成分进行分析研究。结果表明涂层对Ti60合金在600,650和750℃均有较好的抗氧化性能。循环氧化动力学曲线基本上符合抛物线规律。涂层显著提高了Ti60合金抗氧化性能。     

电沉积生物活性陶瓷涂层技术

介绍了电沉积法（包括电泳沉积EPD和电化学沉积ECD）在Ti或Ti合金基体上制备生物活性陶瓷涂层HAP的制备工艺,评述了电沉积的主要控制参数,总结了该技术的特点并展望了其应用前景。     

电弧离子镀梯度（Ti，Al）N涂层的结构与机械性能研究

采用电弧离子镀（AIP）技术，在航空发动机压气机用1Cr11Ni2W2MoV不锈钢上沉积了TiN涂层、（Ti，Al）N涂层和梯度（Ti，Al）N涂层。运用带能谱的扫描电镜（SEM／EDAX）、电子探针（EPMA）、X射线衍射仪（XRD）、显微硬度仪、多功能摩擦磨损实验机等仪器和热震实验对上述涂层的结构、机械性能和基体与涂层的结合性能进行了研究。结果表明，梯度涂层的Al含量由涂层／基体界面向涂层表面逐渐增多，内层Al含量为3％（原子分数），外层Al含量为47％（原子分数）；梯度涂层具有Bl型（NaCl）单相结构和（220）择优取向；梯度涂层的硬度和耐磨与（Ti，Al）N涂层相近，且明显高于TiN涂层，结合性能优于（Ti，Al）N涂层。     

物理气相沉积TiN复合涂层研究进展

物理气相沉积 (PVD) Ti N涂层已获广泛应用。为克服单一 Ti N涂层的缺陷及进一步改善 Ti N涂层的性能 ,近年来致力于复合涂层的研究。本文综述了 Ti N+ Ti、Ti N+化学镀 Ni-P、Ti N+氮化等复合涂层的工艺、组织和性能之间的关系 ,并探讨了过渡层的作用。     

真空电弧离子镀沉积Ni基合金涂层的研究

Ni基合金涂层是我国近几年着力研究并应用于燃气轮机，飞机叶片的新型合金涂层，为扩大对Ni基合金涂层品种多元化的研究，本研究了NiCrWTi合金涂层的常规工艺及其性能，结果表明：采用真空电弧离子镀技术沉积NiCrWTi合金涂层的组织结构致密，结合强度高，耐腐蚀性能好。     

反应溅射（Al，Ti）（0，N）涂层的微结构与力学性能

采用Al—Ti镶嵌复合靶在Ar、N2和O2混合气体中反应溅射制备了一系列（Al，Ti）（O，N）涂层。并采用EDS、XRD、TEM和微力学探针研究了薄膜的化学成分、微结构和力学性能。结果表明，随氧分压的提高，涂层中氧含量逐步增加，氮含量相应减少，（Al＋Ti）：（O＋N）的化学计量比仍约为1：1，涂层保持与（Al，Ti）N涂层相同的NaCl结构。低氧含量时薄膜在（111）方向上择优生长，随着氧含量的提高，涂层生长的择优取向发生改变，高氧含量薄膜样品呈现强烈（200）织构的柱状晶。与此同时，（Al，Ti）（O，N）涂层的硬度和弹性模量也仍保持在与（Al，Ti）N涂层相当的35GPa和370～420GPa的高值。由于涂层中形成了相当含量的氧化物，这类涂层的抗氧化能力有望得到提高。     

热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响

为研究不同温度热处理对激光熔覆钛基复合涂层组织和微动磨损性能的影响,采用激光熔覆技术在TA2钛合金表面制备40%Ti-25.2%TiC-34.8%WS_2(质量分数)复合涂层,将涂层分别置于300,500℃和700℃真空中保温1h,分析热处理前后涂层的显微组织和微动磨损耐磨性能。结果表明:未经过热处理涂层及经过不同温度热处理涂层的主要物相均为α-Ti,(Ti,W)C_(1-x),TiC,Ti_2SC和TiS。未热处理及经过300,500℃和700℃热处理1h涂层的显微硬度分别为1049.8,980.7,1143.3HV_(0.5)和1190.7HV_(0.5)。经过700℃热处理1h涂层表现出优异的微动磨损性能,磨损机理为黏着磨损和磨粒磨损。     

AlTiN layer effect on mechanical properties of Ti-doped diamond-like carbon composite coatings

Ti/Ti-doped diamond-like carbon (DLC) and Ti/AlTiN/Ti-DLC composite coatings were deposited by magnetron sputtering on W18Cr4V high speed steel substrates. The effect of the AlTiN support layer on the properties of these composite coatings was investigated through microstructure and mechanical properties characterization, including hardness, elastic modulus, coefficient of friction and wear properties measured by scanning electron microscopy, Raman spectroscopy, scratch and ball-on-disk friction tests. Ti and AlTiN interlayers have a columnar structure with 50-80 nm grains. The hardness and elastic modulus of Ti/Ti-DLC and Ti/AlTiN/Ti-DLC coatings is 25.9 ± 0.4, 222.2 ± 6.3 GPa and 19.3 ± 1, 205.6 ± 6.7 GPa, respectively. Adhesion of Ti-DLC, Ti/AlTiN/Ti-DLC and AlTiN/Ti-DLC coatings expressed as the critical lateral force is 26.5 N, 38.2 N, and 47.8 N, respectively. Substrate coefficient of friction without coatings is 0.44, and it is 0.1 for Ti/Ti-DLC and Ti/AlTiN/Ti-DLC coatings. Wear resistance of Ti/AlTiN/Ti-DLC composite coatings is much higher than Ti/Ti-DLC coatings based on the wear track width of 169.8 and 73.2 μm, respectively, for the same experimental conditions.     

Effect of negative bias voltage on mechanical and electrochemical nature in Ti–W–N coatings

Mechanical and electrochemical surface properties of Si (100) and AISI D3 steel substrates-coated Ti–W–N, deposited by r.f. magnetron sputtering process from a binary (50% Ti, 50% W) target in an Ar/N₂ (90%/10%) mixture, have been studied using nanoindentation, Tafel polarization curves and electrochemical impedance spectroscopy (EIS). The crystallinity of the coatings was analyzed via X-ray diffraction (XRD) and the presence of TiN(111), TiN(200), WN₂(107), and W₂N(220) phases were determined. Depth sensing nanoindentation measurements were used to investigate the elasto-plastic behavior of Ti–W–N coatings. Each group of samples was deposited under the same experimental conditions (power supply, Ar/N₂ gas mixture and substrate temperature), except the d.c. negative bias voltage that varied (0, ?50, and ?100 V) in order to study its effect on the mechanical and electrochemical properties of AISI D3 steel coated with Ti–W–N coatings. The measurements showed that the hardness and elastic modulus increase from 19 to 30 GPa and from 320 to 390 GPa, respectively, as a function of the increasing negative bias voltage. Coating track and coating-substrate debonding have been observed with atomic force microscopy (Asylum Research MFP-3D^®) on the indentation sites. Finally, the corrosion resistance of Ti–W–N coatings in 3.5 wt% NaCl solution was obtained from electrochemical measurements in relation to the increase of the negative bias voltage. The obtained results have shown that at the higher negative bias voltage (?100 V), the steel coated with Ti–W–N coatings presented the lower corrosion resistance. The corrosion resistance of Ti–W–N in 3.5 wt% NaCl solution was studied in relation to the increase of the bias voltage.     

等离子喷涂HA/Ti复合涂层研究 I.结构、组成和力学性能

采用等离子喷涂方法,在Ｔｉ－６Ａｌ－４Ｖ基体上成功地制备了ＨＡ／Ｔｉ复合涂层,并对复合涂层的微观结构、相组成和力学性能进行了研究．结果表明,ＨＡ和Ｔｉ两相均匀地分布于复合涂层中．ＨＡ／Ｔｉ复合涂层的结合强度明显高于纯 ＨＡ涂层,这主要是由于 ＨＡ／Ｔｉ的复合缓和了涂层与基体之间的热膨胀系数失配．ＨＡ／Ｔｉ复合涂层在模拟体液中浸泡一段时间后,结合强度没有明显降低．ＨＡ／Ｔｉ复合涂层的断裂韧性和硬度均高于 ＨＡ涂层．     

等离子喷涂HA/Ti复合涂层研究 I.结构、组成和力学性能

采用等离子喷涂方法,在Ｔｉ－６Ａｌ－４Ｖ基体上成功地制备了ＨＡ／Ｔｉ复合涂层,并对复合涂层的微观结构,相组成和力学性能进行了研究。结果表明,ＨＡ和Ｔｉ两相均匀地分布于复合涂层中。ＨＡ／Ｔｉ复合涂层的结合强度明显高于纯ＨＡ涂层,这主要是由于ＨＡ／Ｔｉ的复合和了涂层与基体之间的热膨胀系数失配,ＨＡ／Ｔｉ复合涂层在模拟体液中浸泡一段时间后,结合强度没有明显降低,ＨＡ／Ｔｉ复合涂层的断裂韧性和硬度均高于Ｈ     

反应火焰喷涂TiC/Fe复合涂层显微结构研究

采用前驱体碳化复合技术制备Ti-Fe-C系反应喷涂复合粉末,通过反应火焰喷涂技术成功制备了TiC/Fe基金属陶瓷复合涂层.利用XRD和SEM对喷涂粉末和涂层的成分、组织结构进行了分析,考察了喷涂粉末粒度、Ti的加入方式对涂层组织结构的影响.研究结果表明:所制备的TiC/Fe复合涂层由不同含量TiC颗粒分布于晶粒内部而形成的晶内型复合强化片层组织叠加而成,TiC颗粒呈纳米级;喷涂粉末粒度较大时,制备的涂层中出现有害相Fe2Ti,片层厚度较大,孔隙率高;以纯Ti粉为Ti源制备的喷涂粉末和以TiFe粉为Ti源制备的喷涂粉末相比较,其涂层中硬质相TiC含量较少,孔隙率较大.     

C/ Ti 原子比对反应火焰喷涂TiC/ Fe 复合涂层组织结构和硬度的影响

以TiFe 粉和碳的前驱体(石油沥青) 为原料, 用前驱体碳化复合技术制备了Ti-Fe-C 反应喷涂复合粉末, 并采用普通火焰喷涂技术成功制备了TiC/ Fe 陶瓷金属复合涂层。研究了不同C/ Ti 原子比对反应火焰喷涂TiC/ Fe 复合涂层相组成、显微结构和硬度的影响。结果表明, 前驱体碳化复合技术制备的Ti-Fe-C 系反应喷涂复合粉末中C/ Ti 原子比是影响涂层相组成、显微结构和硬度的关键因素。C/ Ti 原子比不同, 涂层的相组成和硬度不同; 随着C/ Ti 原子比增大, 涂层中TiC 团聚富集区增大, 涂层的孔隙率也随之增大。      

PIIID-formed (Ti,O)/Ti, (Ti,N)/Ti and (Ti,O, N)/Ti coatings on NiTi shape memory alloy for medical applications

(Ti, O)/Ti, (Ti, N)/Ti and (Ti, O, N)/Ti composite coatings were fabricated on NiTi shape memory alloy via plasma immersion ion implantation and deposition (PIIID). Surface morphology of samples was investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). Cross-sectional morphology indicated that the PIIID-formed coatings were dense and uniform. X-ray diffraction (XRD) was used to characterize the phase composition of samples. X-ray photoelectron spectroscopy (XPS) results showed that the surface of coated NiTi SMA samples was Ni-free. Nanoindentation measurements and pin-on-disc tests were carried out to evaluate mechanical properties and wear resistance of coated NiTi SMA, respectively. For the in vitro biological assessment of the composite coatings in terms of cell morphology and cell viability, osteoblast-like SaOS-2 cells and breast cancer MCF-7 cells were cultured on NiTi SMA samples, respectively. SaOS-2 cells attached and spread better on coated NiTi SMA. Viability of MCF-7 cells showed that the PIIID-formed composite coatings were noncytotoxic and coated samples were more biocompatible than uncoated samples.     

纳米TiO_2-WO_3复合涂层及纳米TiO_2/WO_3叠层涂层的制备及性能

为了解决电子池材料改性TiO2涂层暗态下无阴极保护作用的问题,用溶胶-凝胶法及浸渍提拉技术在304不锈钢表面制备了纳米TiO2-WO3复合涂层与纳米TiO2/WO3叠层涂层,用扫描电镜(SEM)、X射线光电子能谱仪(XPS)研究了2种涂层的表面形貌、成分,并用电化学方法研究了2种涂层的光阴极保护特性及耐腐蚀性能。结果表明:2种涂层表面均连续均匀,由Ti,W,O,C组成;紫外光照1 h时2种涂层均对304不锈钢有一定的光阴极保护作用,闭光后纳米TiO2/WO3叠层涂层的延时阴极保护作用远好于纳米TiO2-WO3复合涂层;2种涂层均对304不锈钢有防腐蚀作用,紫外光照射时纳米TiO2-WO3复合涂层的防腐蚀性比纳米TiO2/WO3叠层涂层的好。