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| 1 | Influence of Substrate Negative Bias on Structure and Properties of TiN Coatings Prepared by Hybrid HIPIMS Method显示文摘TiN coatings were deposited using a hybrid home-made high power impulse magnetron sputtering(HIPIMS)technique at room temperature.The effects of substrate negative bias voltage on the deposition rate,composition,crystal structure,surface morphology,microstructure and mechanical properties were investigated.The results revealed that with the increase in bias voltage from-50 to-400 V,TiN coatings exhibited a trend of densification and the crystal structure gradually evolved from(111) orientation to(200)orientation.The growth rate decreased from about 12.2 nm to 7.8 nm per minute with the coating densification.When the bias voltage was-300 V,the minimum surface roughness value of 10.1 nm was obtained,and the hardness and Young's modulus of TiN coatings reached the maximum value of 17.4 GPa and 263.8 GPa,respectively.Meanwhile,the highest adhesion of 59 N was obtained between coating and substrate. | Zhenyu Wang Dong Zhang Peiling Ke Xincai Liu Aiying Wang | 2015 | Journal of Materials Science & Technology2015，31，1： | 10 |
| 2 | Preparation of Ti_2AlC MAX Phase Coating by DC Magnetron Sputtering Deposition and Vacuum Heat Treatment显示文摘Due to the excellent corrosion resistance and high irradiation damage resistance,Ti_2AlC MAX phase is considered as a candidate for applications as corrosion resistant and irradiation resistant protective coating.MAX phase coatings can be fabricated through firstly depositing a coating containing the three elements M,A,and X close to stoichiometry of the MAX phases using physical vapor deposition,followed by heat treatment in vacuum.In this work,Ti-Al-C coating was prepared on austenitic stainless steels by reactive DC magnetron sputtering with a compound Ti_(50)Al_(50) target,and CH4 used as the reactive gas.It was found that the as-deposited coating is mainly composed of Ti_3AlC antiperovskite phase with supersaturated solid solution of Al.Additionally,the ratio of Ti/Al remained the same as that of the target composition.Nevertheless,a thicker thermally grown Ti_2AlC MAX phase coating was obtained after being annealed at 800℃ in vacuum for 1 h.Meanwhile,the ratio of Ti/Al became close to stoichiometry of Ti_2AlC MAX phases.It can be understood that owing to the higher activity of Al,it diffused quickly into the substrate during annealing,and then more stable Ti_2AlC MAX phases transformed from the Ti_3AlC antiperovskite phase. | Zongjian Feng Peiling Ke Aiying Wang | 2015 | Journal of Materials Science & Technology2015，31，12： | 10 |
| 3 | Erosion behavior and failure mechanism of Ti/TiAlN multilayer coatings eroded by silica sand and glass beads显示文摘Severe erosion by hard particles is a crucial problem to engine blades when aircraft take off and land in harsh environments, especially for the developed lightweight titanium alloy components. Here, we deposited the Ti/TiAlN multilayer coatings with various cycles on Ti–6 Al–4 V substrates by a home-made hybrid multisource cathodic arc system. The effects of the silica sand and glass beads on erosion behavior of the coatings were focused. Results showed that the Ti/TiAlN multilayer coatings eroded by the silica sand exhibited the predominant 'layer by layer' failure mechanism. In particular, increasing the number of cycles led to the dramatic increase in erosion rate for Ti/TiAlN multilayer coatings, due to the deterioration of their mechanical properties. Different from the silica sand case, however, the erosion rate of the coatings treated by glass beads indicated faint dependence upon the number of cycles, where the coating failure was dominated by the 'piece by piece' failure mechanism. Noted that the Ti layers along with the formed interfaces enhanced the erosion resistance of the coatings, although the failure mechanisms were differently eroded by silica sand and glass beads. Meanwhile, the Ti layers and interfaces hindered the propagation of radial cracks and restrained the lateral cracks within one single TiAlN layer. | Jintao Shuai Xiao Zuo Zhenyu Wang Lili Sun Rende Chen Li Wang Aiying Wang Peiling Ke | 2021 | Journal of Materials Science & Technology2021，，21： | 8 |
| 4 | Structural design of Cr/GLC films for high tribological performance in artificial seawater:Cr/GLC ratio and multilayer structure显示文摘In this paper,graphite-like carbon(GLC)films with Cr buffer layer were fabricated by DC magnetron sputtering technique with the thickness ratio of Cr to GLC films varying from 1:2 to 1:20.The effect of Cr/GLC modulation ratio on microstructure,mechanical and tribological properties in artificial seawater was mainly investigated by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),nano-indenter and a reciprocating sliding tribo-meter.The propagation of defects plays an important role in the evolution of delamination,which is critical to wear failure of GLC films in artificial seawater.Designing the proper multilayer structure could inhibit the defects propagation and thus protect the basis material.The multilayer Cr/GLC film with optimized ratio of 1:3 demonstrates a low average friction coefficient of 0.08±0.006 and wear rate of(2.3±0.3)×10^(-8)mm^3/(N m)in artificial seawater,respectively. | Lei Li Peng Guo Lin-Lin Liu Xiaowei Li Peiling Ke Aiying Wang | 2018 | Journal of Materials Science & Technology2018，34，8： | 7 |
| 5 | Microstructure, mechanical and tribological behaviors of MoS 2 -Ti composite coatings deposited by a hybrid HIPIMS method显示文摘 | Xiaopeng Qin Peiling Ke Aiying Wang Kwang Ho Kim | 2013 | Surface & Coatings Technology2013，，： | 2 |
| 6 | Microstructure and Tribological Behavior of Self-lubricating(Si:N)-DLC/MAO Coatings on AZ80 Magnesium Substrate显示文摘The combined micro arc oxidation(MAO)and a hybrid beam deposition process was used to deposit duplex(Si:N)-DLC/MAO coatings on AZ80 magnesium alloy.The microstructure and composition of the duplex coatings were analyzed by Raman spectroscopy,X-ray photoelectron spectroscope(XPS),scanning electron microscope(SEM)and atomic force microscopy(AFM).Tribological behaviors of the coatings were studied by ball-on-disk friction test.It was found that the ID/IG ratio of the(Si:N)-DLC(diamond-like carbon)top films increases with decreasing C2H2/N2ratio.The(Si:N)-DLC top film with Si3N4was formed on the MAO coated sample as the C2H2/N2ratio was 10sccm:5sccm,which showed an increasing critical load compared with the pure DLC directly deposited on the Mg alloy substrate.As a result,the(Si:N)-DLC/MAO coating exhibited an advanced wear protection for the substrate. | Wei YANG Zhennan DENG Dong ZHANG Peiling KE Aiying WANG | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，6： | 2 |
| 7 | Insights on high temperature friction mechanism of multilayer ta-C films显示文摘In this work,the high temperature friction mechanism of the tetrahedral amorphous carbon(ta-C)film was elucidated.The multilayer ta-C film with alternating hard and soft sub-layers exhibited a low friction coefficient of 0.14 at 400℃ before a sudden failure occurred at 4600 cycles.The wear failure was attributed to the gradual consumption of the ta-C film at the contact region.The design of a hard or soft top layer effectively regulated the high temperature friction properties of the multilayer ta-C.The addition of a hard top layer contributed to a low friction coefficient(0.11)and a minor wear rate(4.0×10^(-7)mm^(3)/(N m)),while a soft top layer deteriorated the lubrication effect.It was proposed that the passivation of dangling bonds at the sliding interface dominated the low-friction mechanism of the ta-C film at high temperature,while the friction induced graphitization and the formation of sp^(2)-rich carbonaceous transfer layer triggered C-C inter-film bonding,resulting in serious adhesion force and lubrication failure.Moreover,the multilayer ta-C film with hard top layer obtained excellent friction performance within 500℃,while the high temperature induced oxidation and volatilization of carbon atoms led to the wear failure at 600℃. | Jing Wei Peng Guo Hao Li Peiling Ke Aiying Wang | 2022 | Journal of Materials Science & Technology2022，，2： | 2 |
| 8 | Investigation of the microstructure, mechanical properties and tribological behaviors of Ti-containing diamond-like carbon films fabricated by a hybrid ion beam method显示文摘 | Wei Dai Peiling Ke Myoung-Woon Moon Kwang-Ryeol Lee Aiying Wang | 2012 | Thin Solid Films2012，，19： | 1 |
| 9 | Long-term tribocorrosion resistance and failure tolerance of multilayer carbon-based coatings显示文摘Current tribocorrosion research of metallic materials and their surface protective coatings mainly focuses on their short-term properties,with test time of 0.5‒2.0 h and a sliding distance 50‒500 m,which may significantly deviate from the practical long-term service condition and thus cause a catastrophe of marine equipments.In this study,three carbon-based multilayer coatings(Ti/DLC,TiC_(x)/DLC,and Ti‒TiC_(x)/DLC)were deposited on S32750 substrates,and both short-term and long-term tribocorrosion behaviors were investigated.The experimental results indicate that the coatings substantially improve the tribocorrosion resistance of the S32750 stainless steel.During the short-term tribocorrosion test,TiC_(x)/DLC exhibited the best tribocorrosion resistance owing to its high hardness.During the long-term tribocorrosion test,however,Ti‒TiC_(x)/DLC coating indicated the best anti-tribocorrosion performance owing to its excellent fracture toughness together with high hardness.Moreover,under 5 N,Ti‒TiC_(x)/DLC can withstand a long-term test of more than 24 h.Additionally,under a higher load of 20 N,the Ti‒TiC_(x)/DLC with a corresponding sliding distance of approximately 1,728 m maintained a low friction coefficient of approximately 0.06.However,the coating was completely worn out;this is attributable to the formation of tribocorrosion products consisting of graphitized carbon and nanocrystalline Fe_(x)O_(y). | Hao LI Linlin LIU Peng GUO Lili SUN Jing WEI Yingrui LIU Shuyu LI Shuyuan WANG Kwang-Ryeol LEE Peiling KE Aiying WANG | 2022 | Friction2022，10，10： | 1 |
| 10 | Accelerated deterioration mechanism of 316L stainless steel in NaCl solution under the intermittent tribocorrosion process显示文摘In this research,the tribocorrosion behavior of 316L stainless steel in simulated seawater was investigated under continuous and intermittent sliding at open circuit potential.The tribocorrosion mechanism was discussed in terms of wear morphologies,mechanical property as well as chemical composition.Meanwhile,microstructure evolution inside the wear track and open circuit potential recorded after sliding were analyzed to quantify the repassivation kinetics and evaluate the impact of the regenerated passive film on wear.The results showed that the wear rate increased under intermittent sliding when the pause time is long enough to repassivate after sliding.Repeated sliding promoted the refinement of the grain inside the sliding area,which was beneficial to the generation of the thicker and more compact passive film inside the wear track.The ruptured passive film often acted as abrasives during subsequent sliding.Therefore,the accelerated material loss under intermittent sliding was attributed to the periodic mechanical removal of the thickened passive film and the enhanced abrasive wear inside the wear track. | Yingrui Liu Linlin Liu Shuyu Li Rujia Wang Peng Guo Aiying Wang Peiling Ke | 2022 | Journal of Materials Science & Technology2022，，26： | 1 |
| 11 | MAX phase forming mechanism of M-Al-C(M=Ti,V,Cr)coatings:In-situ X-ray diffraction and first-principle calculations显示文摘The interesting hybrid properties of ceramics and metals induced by unique nano-laminated structures make the M_(n+1)AX n(MAX)phase attractive as a potential protective coating for vital structural compo-nents in harsh systems.However,an extremely narrow phase-forming region makes it difficult to prepare MAX phase coatings with high purity,which is required to obtain coatings with high-temperature anti-oxidation capabilities.This work describes the dependence of the phase evolution in deposited M-Al-C(M=Ti,V,Cr)coatings as a function on temperature using in-situ X-ray diffraction analysis.Compared to V_(2)AlC and Cr_(2)AlC MAX phase coatings,the Ti_(2)AlC coating displayed a higher phase-forming tempera-ture accompanied by a lack of any intermediate phases before the appearance of the Ti_(2)AlC MAX phase.The results of the first-principle calculations correlated with the experience in which Ti_(2)AlC exhibited the largest formation energy and density of states.The effect of the phase compositions of these three MAX phase coatings on mechanical properties were also investigated using ex-situ Vickers and nano-indenter tests,demonstrating the improved mechanical properties with good stability at high temperatures.These findings provide a deeper understanding of the phase-forming mechanism of MAX phase coatings to guide the preparation of high-purity MAX phase coatings and the optimization of MAX phase coatings with expected intermediate phases such as Cr_(2)C,V_(2)C etc.,as well as their application as protective coat-ings in temperature-related harsh environments. | Jianghuai Yuan Zhenyu Wang Guanshui Ma Xiaojing Bai Yong Li Xiaoying Cheng Peiling Ke Aiying Wang | 2023 | Journal of Materials Science & Technology2023，，12： | 0 |
| 12 | The chemical reprogramming of unipotent adult germ cells towards authentic pluripotency and de novo establishment of imprinting显示文摘Although somatic cells can be reprogrammed to pluripotent stem cells(PsCs)with pure chemicals,authentic pluripotency of chemically induced pluripotent stem celis(CipsCs)has never been achieved through tetraploid complementation assay.Spontaneous reprogramming of spermatogonial stem cells(ssCs)was another non-transgenic way to obtain PsCs,but this process lacks mechanistic explanation.Here,we reconstructed the trajectory of mouse SsC reprogramming and developed a five-chemical combination,boosting the reprogramming effciency by nearly 80-to 100-folds.More importantly,chemical induced germline-derived PsCs(5C-gPSCs),but not gpsCs and chemical induced pluripotent stem cells,had authentic pluripotency,as determined by tetraploid complementation.Mechanistically,ssCs traversed through an inverted pathway of in vivo germ ceil development,exhibiting the expression signatures and DNA methylation dynamics from spermatogonia to primordial germ cells and further to epiblasts.Besides,ssC-specific imprinting control regions switched from biallelic methylated states to monoallelic methylated states by imprinting demethylation and then re-methylation on one of the two alleles in 5c-gPsCs,which was apparently distinct with the imprinting reprogramming in vivo as DNA methylation simultaneously occurred on both alleles.Our work sheds ight on the unique regulatory network underpinning SsC reprogramming,providing insights to understand generic mechanisms for cell-fate decision and epigenetic-relateddisorders in regenerative medicine. | Yuhan Chen Jiansen Lu Yanwen Xu Yaping Huang Dazhuang Wang Peiling Liang Shaofang Ren Xuesong Hu Yewen Qin Wei Ke Ralf Jauch Andrew Paul Hutchins Mei Wang Fuchou Tang Xiao-Yang Zhao | 2023 | Protein & Cell2023，14，7： | 0 |
| 13 | Measurement of electron beam transverse slice emittance using a focused beamline显示文摘A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole.The betatron phase of electrons based on laser wakefield acceleration(LWFA)is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing(defocusing)field in the bubble.The phase space presents slice information after phase compensation relative to the center energy.Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment.The diagnosis of slice emittance facilitates local electron quality manipulation,which is important for the development of LWFA-based free electron lasers.The quasi-3D particle-in-cell simulations matched the experimental results and analysis well. | Kangnan Jiang Ke Feng Hao Wang Xiaojun Yang Peile Bai Yi Xu Yuxin Leng Wentao Wang Ruxin Li | 2023 | High Power Laser Science and Engineering2023，11，3： | 0 |
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