等离子喷涂氧化锆涂层及激光重熔涂层的摩擦磨损性能

采用等离子喷涂制备了常规氧化锆涂层和纳米氧化锆涂层,并对制备的纳米氧化锆涂层进行了激光重熔处理,系统地研究了3种氧化锆涂层(常规、纳米和激光重熔涂层)在常温和高温下的摩擦磨损性能.结果表明,纳米氧化锆涂层耐磨性能明显优于常规氧化锆涂层,而激光重熔处理后的纳米氧化锆涂层在常温和高温下,都表现出最低的摩擦系数和最好的耐磨性能.这3种涂层的表面粗糙程度、涂层孔隙率和裂纹状况明显不同,从而表现出不同的摩擦磨损特性;说明纳米粉末等离子喷涂结合激光重熔技术是提高氧化锆涂层性能的有效方法.     

非晶碳涂层的摩擦磨损性能研究

采用多源磁控溅射物理气相沉积法在单晶硅表面制备梯度变化非晶碳涂层(类金刚石薄膜),通过调整工艺参数获得厚度在1～2μm的涂层.采用MML多功能纳米性能测试系统测试了非晶碳涂层的纳米硬度和弹性模量.采用CETR UTM-2型显微摩擦测试仪测试了非晶碳涂层在不同载荷下的摩擦磨损行为.结果表明,涂层具有较高的硬度和弹性模量,可以分别达到12.5GPa和184GPa;涂层在不同的载荷下具有较好的摩擦性能,摩擦因数基本保持在0.1左右,磨损率达到10-9 mm3/ N·m数量级.     

纳米颗粒增强NiCoCrAlY熔覆涂层的高温摩擦磨损行为

采用激光熔覆技术,在镍基高温合金表面制备相同含量的3种不同纳米颗粒增强的NiCoCrAlY涂层,考察它们在500℃空气氛围下的干摩擦磨损行为,并与未加纳米颗粒的涂层进行比较。结果表明：纳米颗粒增强涂层的高温摩擦磨损机制与未加纳米颗粒的涂层一致,均为强烈塑性变形引起的剥层磨损和氧化磨损;加入纳米颗粒后,涂层的摩擦因数增大且随滑行距离的增加呈减小趋势,涂层的磨损率仅为未加纳米颗粒涂层的34.0%～64.5%。在3种纳米颗粒中,纳米SiC颗粒对涂层高温耐磨性的改善最为显著。     

TC4合金表面纳米晶涂层的摩擦学性能研究

通过双阴极等离子技术在TC4合金表面制备了不同铬含量的纳米晶体涂层,并研究了纳米晶涂层的摩擦磨损性能。结果表明,机械用材料表面纳米晶涂层与基体结合的紧密程度与涂层组织的均匀性和致密性密切相关。纳米涂层的弹性模量以及涂层的硬度随着纳米晶涂层中铬含量的增加而增加,而磨损率和摩擦因数均降低。     

纳米掺杂Al2O3＋13wt% TiO2等离子喷涂涂层的抗磨损性能

采用纳米掺杂(5%～30%)方法制备出纳米包覆微米级粒子的AT13等离子喷涂粉末,并利用大气等离子喷涂技术制备出了含有纳米复相结构的陶瓷涂层.在MM-200型磨损试验机上进行了常温干摩擦试验,比较了纳米复相结构涂层和传统陶瓷涂层的耐磨性能,利用扫描电镜观察了磨损后的磨痕形貌.结果表明,纳米复相涂层的耐磨性能明显好于传统陶瓷涂层,且随着磨损载荷的增大,纳米复相涂层和传统涂层的磨损机制的变化是不同的,传统涂层的磨损机理主要是微裂纹和颗粒的剥落,而相同条件下纳米复相涂层则由于涂层韧性的提高,主要表现为涂层的粘着磨损与局部剥落,并对纳米掺杂等离子喷涂涂层对AT13涂层磨损机制的影响进行了探讨.     

多弧离子镀制备TiAlCN和TiAlN涂层的结构和摩擦磨损性能

目的 对比研究TiAlCN和TiAlN涂层的结构、塑韧性、结合力和摩擦磨损性能.方法 采用多弧离子镀技术制备了TiAlCN和TiAlN涂层.利用扫描电镜(SEM)、X射线衍射仪(XRD)和X射线光电子能谱仪(XPS)研究了涂层的微观形貌、元素和物相组成.通过纳米压痕、纳米划痕、划痕测试仪和摩擦磨损实验研究了涂层的硬度、...     

光发射谱对CrTiAlN涂层性能的影响

在不同光发射谱(OEM)条件下,采用闭合场非平衡磁控溅射技术(CFUBMSIP)在SDC99冷作模具钢表面沉积CrTiAlN涂层,采用X射线衍射仪(XRD)、显微硬度仪、原位纳米力学测试系统和销盘摩擦磨损试验机(POD)测试分析涂层的相结构、表面硬度以及耐磨损性能。结果表明:各条件下制备的CrTiAlN涂层均为FCC结构,且在(200)晶面择优取向;光发射谱值为65时,制备的CrTiAlN涂层具有较高的表面承载能力以及膜基结合力,纳米硬度和弹性模量分别为22.7 GPa和276.4 GPa;OEM65制备的CrTiAlN涂层较OEM70、OEM80制备的CrTiAlN涂层具有更低的摩擦因数和磨损率,表现出更佳的摩擦磨损性能。     

等离子喷涂纳米ZrO_2涂层的摩擦磨损性能研究

采用等离子喷涂法在钛合金(TC4)基体上制备纳米陶瓷涂层。研究了烧结型陶瓷、纳米陶瓷和纳米球化陶瓷涂层的微动摩擦磨损性能。结果表明:在微动磨损滑移区、不同载荷水平下,三种涂层均呈现相同的耐磨性规律,耐磨性能由好到差的顺序为纳米球化陶瓷纳米陶瓷烧结型陶瓷。     

摩擦堆焊法在Ti-6Al-4V表面制备的AA2124/4wt.%B_4C纳米复合涂层的显微组织和磨损特性（英文）

为了提高Ti-6Al-4V的耐磨性,运用摩擦堆焊法在其表面制备AA2124/4wt.%B_4C纳米复合涂层。采用传统搅拌铸造方法制备复合材料,然后用自主研发的摩擦堆焊机在不同的转速下进行涂覆。采用传统和先进显微技术对复合镀层的显微组织进行观察,采用销-盘装置对制备材料的滑动磨损性能进行评价。复合涂层的厚度和宽度均随转速的增加而增加。涂层与基体的界面呈直线,未观察到厚的金属间层。结果还表明,纳米B_4C粒子在复合涂层中分布均匀,晶粒细小,铝基体与B_4C颗粒的界面结合良好。总之,该复合涂层由于其较小的有效接触面积,较低的摩擦因数和良好的界面结合性能,使钛合金基体的耐磨性得到提高。     

碳含量对TiAlCN涂层结构和摩擦学性能的影响

目的 探索制备摩擦因数低、硬度高、弹性模量高和耐磨性高的TiAlCN涂层.方法 采用多弧离子镀技术在F690钢表面沉积具有不同碳含量的TiAlCN涂层.通过扫描电镜(SEM)、激光共聚焦显微镜、拉曼光谱仪、透射电子显微镜、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、纳米压痕仪、往复式摩擦磨损仪和台阶仪对涂层的...     

TiBCN:CNx multilayer coatings deposited by pulsed closed field unbalanced magnetron sputtering

In this study, a combination of nanocomposite and multilayer coating design was investigated in an effort to reduce the coefficient of friction (COF) while maintaining good mechanical properties of the TiBCN coatings. The TiBCN:CN_x coatings consist of TiBCN and CN_x nanolayers which were deposited alternately by reactive sputtering a TiBC composite target (80 mol% TiB₂ + 20 mol% TiC) and a graphite target in an Ar:N₂ mixture using a pulsed closed field unbalanced magnetron sputtering system. Low angle X-ray diffraction and transmission electron microscopy characterizations confirmed that the coatings consist of different bilayer periods in a range of 3.5 to 7.0 nm. The TiBCN layers exhibited a nanocomposite structure, whereas the CN_x layers were in an amorphous state. The mechanical properties and wear resistance of the TiBCN:CN_x multilayer coatings were investigated using nanoindentation and ball-on-disk wear test. The TiBCN:CN_x coatings exhibited high hardness in a range of 20-30 GPa. The highest hardness of 30 GPa was achieved in the coating with a bilayer period of 4.5 nm. A low COF of 0.17 sliding against a WC-Co ball was obtained at a bilayer period of 4.5 nm, which is much lower than those of the single layer TiBCN and TiBC nanocomposite coatings (0.55-0.7).     

Effect of N Doping on Microstructure,Mechanical and Tribological Properties of V-Al-C CoatingsEI北大核心CSCD

The crises of resource shortage have prompted ocean exploitation to spring up all over the world. Some crucial frictional components of marine equipment have to be directly faced with the conjoint action of wear and corrosion. Transition metal nitrides or carbides hard coatings have been widely used to improve tribological performance in various applications. However, the poor toughness, wear and corrosion resistance of coatings cannot meet the harsher marine environment, which needs to obtain multi-functional hard coatings providing complex properties. The nanocomposite structure coatings containing nanocrystalline phase embedded in an amorphous matrix allow tailoring their properties to desired value by designing chemical composition and nanostructure. In this work, V-Al-C and V-Al-C-N coatings were deposited on silicon and high speed steel (HSS) substrates by magnetron sputtering. The crystal microstructure, chemical composition, surface morphology, cross-sectional structure, mechanical property and friction behavior of the coatings under different contact conditions (air, distilled water and artificial seawater) were studied by XRD, XPS, SEM, nano-indentation and ball-on-disc tribometer. The results showed that the V-Al-C coating displayed columnar structure with coarse grain. When the nitrogen was incorporated, the coating structure evolved into nanocomposite structure composed of nanocrystallite and amorphous carbon. The hardness increased from (14 +/- 0.48) GPa to (24.5 +/- 0.8) GPa, and the toughness was significantly improved (H/E>0.1). In air condition, the friction coefficient decreased from 0.70 to 0.42, owing to the synergy interaction between V2O5 and amorphous carbon during sliding. The friction coefficients of the both coatings in distilled water and artificial seawater were lower than those in air owing to the boundary lubrication forming lubricative film by absorbed water. The friction coefficient in seawater was lower than those in distilled water, resulting from the formation of Mg(OH)(2) and CaCO3 during sliding. However, the wear rates of the both coatings in artificial seawater were larger than that in distilled water, which demonstrated a synergism between corrosion and wear in artificial water. The V-Al-C coating was all worn out under different contact conditions owing to severe abrasive wear, while the V-Al-C-N coating showed better wear resistance, with a wear rate of 3.0x10(-16) m(3)/(N center dot m) in air and 1.4x10(-15) m(3)/(N center dot m) in artificial water, respectively.     

HIPIMS制备Cr-B涂层及摩擦学性能

为研究Cr-B涂层在多测试环境(干摩擦、蒸馏水和海水环境)下摩擦磨损行为,采用高功率脉冲磁控溅射沉积技术制备Cr-B涂层,分析涂层成分、结构、微观形貌和力学性能,重点考察涂层在不同环境下的摩擦磨损性能。结果表明:制备的Cr-B涂层,B/Cr的原子比为1.8,结构主要由CrB2和自由Cr相组成,硬度和弹性模量分别为(26.9±1.0)GPa和(306.7±6.0)GPa。摩擦测试结果显示:涂层在干摩擦时具有较高的摩擦因数为0.75,发生严重磨损失效,归因于摩擦过程中涂层剥落而导致严重的磨粒磨损;与干摩擦相比,涂层在蒸馏水和海水环境中的摩擦因数均显著降低,分别为0.26和0.22,这主要由于蒸馏水和海水的边界润滑作用所导致,在蒸馏水中摩擦的磨损机制为磨粒磨损,而在海水中的磨损机制为磨粒磨损和腐蚀磨损的协同作用。     

等离子体增强磁控溅射CrSiN涂层摩擦磨损行为

目的基于细晶强化理论,借助新型涂层制备技术获得综合性能优良的CrSiN涂层,研究Si含量对涂层微观结构、力学性能及耐磨性能的影响规律。方法采用等离子体增强磁控溅射技术,制备四种含有不同Si含量的Cr Si N涂层。使用X射线能谱仪(EDS)、X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)和原子力显微镜(AFM),分析涂层的化学成分、晶体结构、微观形貌和表面粗糙度。使用纳米压痕/划痕仪测试涂层的显微硬度、杨氏模量和结合力。使用摩擦磨损试验仪考察涂层的摩擦磨损行为。结果 Cr Si N涂层中Si含量随着Si靶功率的增加而增加。所有涂层中均未检测到含Si物相,主要由Cr N相组成。随着Si含量的增加,CrN(111)衍射峰逐渐减弱直至消失,涂层由疏松的三角锥结构逐渐变为致密平整的CrN纳米晶和Si3N4非晶共存的复合结构,涂层表面粗糙度显著降低,涂层的显微硬度、杨氏模量、结合力及耐磨性能均呈现先增后降的趋势。结论 Si含量为18.5%的Cr Si N涂层具有最佳的耐磨性能,此时涂层的硬度、杨氏模量、结合力和平均摩擦系数分别约为27 GPa、327 GPa、30 N和0.289。     

不同掺杂设计对类金刚石涂层海水环境摩擦学性能的影响

采用UDP650型闭合场非平衡磁控溅射系统在硅片及316不锈钢基底表面制备了不同掺杂设计的类金刚石涂层(DLC、Cr/DLC和WC/DLC),通过SEM、Raman、硬度仪和划痕仪研究了涂层的结构及力学性能,利用多功能摩擦试验机考察了涂层在大气及海水环境下的摩擦学性能。结果表明,Cr或WC掺杂能显著促进DLC涂层的石墨化,同时提高涂层的结合力及韧性。在摩擦磨损试验中,由于海水的润滑作用,3种涂层在海水环境下的摩擦因数及磨损率均低于大气环境。同时,WC/DLC在3种涂层中表现出最佳的摩擦学性能,这取决于其高的石墨化程度,良好的结合力及优异的韧性。     

环境温度对磁控溅射Ti-Al-Si-N涂层摩擦学性能的影响

目的探索磁控溅射制备的Ti-Al-Si-N涂层在不同环境温度下的摩擦学性能。方法利用磁控溅射技术,在AISI304不锈钢表面制备了Ti-Al-Si-N涂层,采用扫描电镜、能谱仪和X射线衍射仪研究了涂层的成分与微观结构,利用HT-1000型高温摩擦磨损试验机,以直径为5 mm的Al_2O_3球作为摩擦副,研究了Ti-Al-Si-N涂层在室温、200、400、600℃时的摩擦学性能。结果磁控溅射制得的Ti-Al-Si-N涂层表面平整、致密,具有典型的柱状晶结构;在室温、200、400、600℃的环境温度下,涂层的摩擦系数分别为0.6、0.35、0.25和0.2,磨损体积分别为0.319、0.232、0.0149和0.0136 mm~3。涂层的摩擦系数和磨损体积均随温度的升高而降低。结论随着测试温度的升高,磨痕区域生成越多的以氧化钛和氧化铝为主的氧化物,其具有一定的减摩作用。在室温下,涂层的磨损机理主要为疲劳剥落,200℃时为磨粒磨损,400℃时为磨粒磨损和氧化磨损,600℃时主要为氧化磨损。     

Characterization and wear properties of nanoscaled TiN/TaN multilayer coatings

The structural, morphological, mechanical and tribological characterization of nanoscaled multilayer TiN/TaN coatings deposited by magnetron sputtering technology were investigated by low angle X-ray diffractometry, high angle X-ray diffractometry, atomic force microscopy, microhardness, pin-on-disc testing and 3-D surface profiler. The results show that the TiN/TaN coatings exhibit good modulation period and sharp interface between TiN and TaN layers. In mutilayered TiN/TaN coatings, TiN layers have cubic structure, but hexagonal structure emerged among TaN layers besides cubic structure as modulation period is beyond 8.5 nm. The mierohardness is affected by modulation period and the maximum hardness value of 31.5 GPa appears at a modulation period of 8.5 rim. The coefficient of friction is high and the wear resistance is improved for TiN/TaN coatings compared with those of TiN coating; the wear mechanism exhibits predominantly ploughing, material transfer and localized spallation.     

在甘油润滑下TiAlN涂层的超低摩擦和磨损特性∗

TiAlN 涂层具有优异的力学性能,在刀具领域具有广泛的应用背景,然而优化制备参数以获得性能更为优异的 TiAlN 涂层仍需要做进一步的研究,同时与 TiAlN 涂层相适应的绿色润滑剂也是当前亟待解决的问题之一。 基于磁控溅射技术,研究 Al 靶溅射电流对 TiAlN 涂层结构和力学性能的影响,考察甘油润滑下 TiAlN 涂层的摩擦学性能,并利用 X 射线光电子能谱探究甘油的润滑机理。 结果表明:当溅射电流为 3 A 时得到的 TiAlN-3A 涂层具有最致密的晶状结构及最优的力学性能。 在甘油润滑下,TiAlN-3A 涂层的摩擦因数仅为 0. 007,其磨损率为 2. 62×10^-6 mm3N^-1m^-1 。 XPS 分析表明,甘油在钢球与 TiAlN 涂层相对滑动过程中发生摩擦降解反应,在表面上生成新的产物 FeOOH。 FeOOH 的亲水性使得在接触区域表面吸附甘油分子及甘油降解产物形成流体润滑层,可提供优异的减摩和耐磨性能。     

Microstructure and Tribological Behavior of Cr-Cu-N Coatings Deposited by Ion Beam Assisted Magnetron Sputtering

Cr-Cu-N coatings with copper content from 0 at%to 6.8 at%were deposited on silicon and M2 steel by ion beam assisted magnetron sputtering.The microstructure and composition of the coatings were characterized using SEM,GDOES,XRD and XPS.The mechanical properties of the coatings were tested on a standard hardness tester.The tribological behavior of the coatings in dry wear condition was studied by means of ball-on-disc wear test.The experimental results show that addition of copper can restrict the columnar crystal growing to a certain degree.XRD and XPS analysis indicate that coatings are mainly composed of Cr and CrN phase.Cu is mainly existed in a free state in the coatings.Copper adding has no obvious effects on the hardness of the coatings.However,the coatings fracture toughness can be improved by doped copper.The coefficient of friction of the coatings against bearing steel is in the range of 0.25-0.6 changing with the copper content.The coating with 2.6 at%copper shows the lowest coefficient of friction about 0.25 and wear rate which is about one tenth of that of the coating with 6.8 at%copper.The higher coefficient of friction and wear rate of the coating with 6.8at%copper may be attributed to its lower bonding strength.     

TRIBOLOGICAL AND HIGH SPEED TURNING PERFORMANCE IN Ti1-xAlxN COATINGS PREPARED BY CLOSE-FIELD UNBALANCED MAGNETRON SPLTTERING

Titanium-aluminium-nitride (Ti1-xAlxN) coatings were deposited by close-field unbalanced magnetron sputtering on M42 steel substrates and WC-6wt%Co inserts at 450℃. The tribological behavior was analyzed by sliding against steel and WC-6wt%Co balls, while the turning performance was evaluated by a conventional turning machine at high cutting speeds without using coolants. In the tribological tests, the formation of transfer layer and the variations of hardness of the coatings played an important role for sliding against steel balls. For the coatings sliding against WC-6wt%Co balls, the Ti-Al-N coatings showed a similar friction coefficient, but the TiN coating exhibited a lower value. The difference could be explained by the tri-oxidation wear mechanism. In the turning tests, a superior cutting performance of the coating was found at x=0.45, which endured 38 minutes before the tool flank wear reached the maximum value of 0.3mm, whereas only 20 minutes were endured for the TiN coating. The excellent performance of the coatings in the turning tests could be explained by the enhanced mechanical properties and oxidation/diffusion resistance of the coatings.