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Effect of microstructure evolution of Ti6Al4V alloy on its cavitation erosion and corrosion resistance in artificial seawater

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Journal of Materials Science & Technology 2022年第5期100卷 169-181页

作者： Yijing Wang Enkang Hao Xiaoqin Zhao Yun Xue Yulong An huidi zhou State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The investigate about the effect of the microstructure of Ti6Al4V alloy on its cavitation erosion and corrosion properties in marine can provide the key basis for the application.On the basis of as-received Ti6Al4V(TC4)alloy,FC-TC4 and AC-TC4 alloys were prepared by heat treatment with the cooling method of a furnace and atmospheric environment,respectively.Then the microstructure evolutions of three samples were scrutinized and the effect of microstructure on their cavitation erosion and corrosion resistance was explored.The results showed that more recrystallized grains formed as well as its content of α grains and high-angle grain boundaries increased in AC-TC4 alloy.To FC-TC4 alloy,there was obvious grain growth apart from recrystallization.Moreover,many nanotwins of Ti V and Ti Al_(3)were formed separately in FC-TC4 and AC-TC4 alloys due to the dislocation migration during heat treatment.The microstructure evolution led the hardness and elastic modulus of AC-TC4 alloy were the best,followed by FC-TC4 alloy,that of TC4 were the worst.Similarly,passivating ability of AC-TC4 alloy was the best among three samples because of its microstructure.Although cracks extended along the grain boundaries under the action of continual cavitation erosion,the passivation film formed by TiO_(2) and Al_(2)O_(3) would enhance their resistance to further corrosion and cavitation erosion in artificial seawater.

关键词： Ti6Al4V alloy Microstructure evolution Cavitation erosion Corrosion Passivation Mechanical property

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Research progress on rolling superlubricity in solid lubricants

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Science China Technological Sciences 2024年第7期67卷 1980-1990页

作者： LI PanPan LI HongXuan ZHU DongXiang ZHU YongQi KANG FuYan WANG Wan ZHANG YaXin LIU XiaoHong JI Li zhou huidi CHEN JianMin State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences School of Chemical Engineering Northwest Minzu University

Superlubricity is an ideal lubrication state where friction nearly vanishes between contact interfaces. It has become one of the most important research topics and approaches owing to its significance in reducing energy consumption and preventing device failures. As an efficient and universal lubricating principle capable of achieving superlubricity, rolling lubrication has attracted widespread attention in recent years. In this review, the theoretical concept of rolling lubrication and the experimental research progress of spherical/scroll structures are summarized. The review focuses on the possibility of achieving rolling lubrication using spherical/scroll structures(such as spherical fullerenes, carbon nanotubes, and formed and constructed spherical/scroll structures). The challenges in achieving rolling lubrication are summarized, and the possibility of molecular rolling lubrication,as well as its potential applications in superlubrication, are discussed.

关键词： spherical/scroll structure rolling lubrication superlubricity fullerene

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High temperature induced“glaze”layer formed in HVOF-sprayed NiCrWMoCuCBFe coating and its wear reduction mechanism

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Friction 2022年第9期10卷 1424-1438页

作者： Yijing WANG Xiaoqin ZHAO Enkang HAO Zhenyu BU Yulong AN huidi zhou Jianmin CHEN State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The in-situ formation of oxides on alloy surface induced by high temperature can effectively reduce wear and resist oxidation.In consideration of the solid solution strengthening effect and great oxidation resistance of additional elements at elevated temperature,the NiCrWMoCuCBFe coating was prepared by high velocity oxygen flame(HVOF)spraying technology,and its tribological behavior was scrutinized from 25 to 800°C.By means of high temperature Vickers hardness tester and high temperature X-ray diffractometer,the mechanical properties and microstructures of NiCrWMoCuCBFe coating were measured.And the effect of the mechanical properties and microstructures of the coating on tribological performance was discussed in detail.The results showed both its friction coefficient(0.37)and wear rate(5.067×10^(−6)mm^(3)·N^(−1)·m^(−1))at 800℃ were the lowest,which was mainly related to the formation of“glaze”layer on the coating surface at high temperature.The glaze layer consisted of two parts,which were NiCr_(2)O_(4)oxide film with the ability of interlaminar slip formed in the outer layer and nano-grains existed in the inner layer.Worth mentioning,these nano-grains provided bearing capability while the oxide film was vital to reduce wear rate and friction coefficient.As the ambient temperature increased,many hard oxides were produced on the wear scars,including NiO,Cr_(2)O_(3),MoO_(3),and Mo_(2)C.They can improve tribological and mechanical properties of NiCrWMoCuCBFe coating at a wide temperature range.

关键词： high temperature wear and friction NiCrWMoCuCBFe coating in-situ oxidation glaze layer mechanical properties

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High-entropy(La_(0.2)Nd_(0.2)Sm_(0.2)Eu_(0.2)Gd_(0.2))_(2)Ce_(2)O_(7):A potential thermal barrier material with improved thermo-physical properties

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Journal of Advanced Ceramics 2022年第4期11卷 615-628页

作者： Yun XUE Xiaoqin ZHAO Yulong AN Yijing WANG Meizhen GAO huidi zhou Jianmin CHEN Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Lab for Magnetism and Magnetic Materials of MOE School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China

High-entropy oxides(HEOs)are widely researched as potential materials for thermal barrier coatings(TBCs).However,the relatively low thermal expansion coefficient(TEC)of those materials severely restricts their practical application.In order to improve the poor thermal expansion property and further reduce the thermal conductivity,high-entropy(La_(0.2)Nd_(0.2)Sm_(0.2)Eu_(0.2)Gd_(0.2))_(2)Ce_(2)O_(7) is designed and synthesized in this work.The as-prepared multicomponent material is formed in a simple disordered fluorite structure due to the high-entropy stabilization effect.Notably,it exhibits a much higher TEC of approximately 12.0×10^(−6) K^(−1) compared with those of other high-entropy oxides reported in the field of TBCs.Besides,it presents prominent thermal insulation behavior with a low intrinsic thermal conductivity of 0.92 W·m^(−1)·K^(−1) at 1400℃,which can be explained by the existence of high concentration oxygen vacancies and highly disordered arrangement of multicomponent cations in the unique high-entropy configuration.Through high-temperature in-situ X-ray diffraction(XRD)measurement,this material shows excellent phase stability up to 1400℃.Benefiting from the solid solution strengthening effect,it shows a higher hardness of 8.72 GPa than the corresponding single component compounds.The superior thermo-physical performance above enables(La_(0.2)Nd_(0.2)Sm_(0.2)Eu_(0.2)Gd_(0.2))_(2)Ce_(2)O_(7) a promising TBC material.

关键词： high-entropy oxides(HEOs) (La_(0.2)Nd_(0.2)Sm_(0.2)Eu_(0.2)Gd_(0.2))_(2)Ce_(2)O_(7) defective fluorite structure thermal expansion coefficient(TEC) thermal conductivity thermal barrier coating(TBC)

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Role of nanoparticles in achieving macroscale superlubricity of graphene/nano-SiO_(2) particle composites

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Friction 2022年第9期10卷 1305-1316页

作者： Panpan LI Li JI Hongxuan LI Lei CHEN Xiaohong LIU huidi zhou Jianmin CHEN Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Recent studies have reported that adding nanoparticles to graphene enables macroscale superlubricity to be achieved.This study focuses on the role of nanoparticles in achieving superlubricity.First,because graphene nanoscrolls can be formed with nanoparticles as seeds under shear force,the applied load(or shear force)is adjusted to manipulate the formation of graphene nanoscrolls and to reveal the relationship between graphene-nanoscroll formation and superlubricating performance.Second,the load-carrying role of spherical nano-SiO_(2)particles during the friction process is verified by comparison with an elaborately designed fullerene that possesses a hollow-structured graphene nanoscroll.Results indicate that the incorporated nano-SiO_(2)particles have two roles in promoting the formation of graphene nanoscrolls and exhibiting load-carrying capacity to support macroscale forces for achieving macroscale superlubricity.Finally,macroscale superlubricity(friction coefficient:0.006–0.008)can be achieved under a properly tuned applied load(2.0 N)using a simple material system in which a graphene/nano-SiO_(2)particle composite coating slides against a steel counterpart ball without a decorated diamond-like carbon film.The approach described in this study could be of significance in engineering.

关键词： nano-SiO_(2)particles graphene macroscale superlubricity lubrication mechanism

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Magnetron sputtering NbSe_(2)film as lubricant for space current-carrying sliding contact

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Friction 2023年第3期11卷 383-394页

作者： Yang YANG Lulu PEI Hongzhang ZHANG Kai FENG Pengfei JU Wenshan DUAN Li JI Hongxuan LI Xiaohong LIU huidi zhou Jianmin CHEN Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Insttute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry&Engineering Yantai UniversityYantai 264005China Shanghai Aerospace Equipment Manufacture Shanghai 200245China

This study demonstrates that magnetron-sputtered NbSe_(2)film can be used as a lubricant for space current-carrying sliding contact,which accommodates both metal-like conductivity and MoS_(2)-like lubricity.Deposition at low pressure and low energy is performed to avoid the generation of the interference phase of NbSe_(3).The composition,microstructure,and properties of the NbSe_(2)films are further tailored by controlling the sputtering current.At an appropriate current,the film changed from amorphous to crystalline,maintained a dense structure,and exhibited excellent comprehensive properties.Compared to the currently available electrical contact lubricating materials,the NbSe_(2)film exhibits a significant advantage under the combined vacuum and current-carrying conditions.The friction coefficient decreases from 0.25 to 0.02,the wear life increases more than seven times,and the electric noise reduces approximately 50%.

关键词： NbSe_(2)films magnetron sputtering vacuum current-carrying tribological properties

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Effect of annealing treatment on microstructures,mechanical properties and cavitation erosion performance of high velocity oxy-fuel sprayed NiCoCrAlYTa coating

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Journal of Materials Science & Technology 2020年第18期52卷 19-31页

作者： Enkang Hao Yulong An Xia Liu Yijing Wang huidi zhou Fengyuan Yan State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics.Chinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Research Center of Modem Surface and Interface Engineering Anhui University of TechnologyMaanshan 340500China

The mechanical parts serving in the marine environment are up against the dual damage of corrosion and cavitation erosion,so the Ni Co Cr Al YTa coating with excellent corrosion resistance is successfully prepared by high velocity oxy-fuel(HVOF)sprayed technology to protect the equipment from deterioration.The chemical composition and mechanical properties as well as the microstructure evolution of the coating before and after annealing treatment are studied.At the same time,the influence of annealing treatment on the corrosion and cavitation erosion behaviors of the coating is investigated,as well.The NiCoCrAlYTa coating mainly containsγ-Ni,β-Ni Al,andγ’-Ni3Al phases.During the deposition,the microcrystals or incomplete crystals generate in the interior of the coating because of the large temperature difference and impact force.Meanwhile,there is twin crystal structure in the as-spayed coating.After annealing treatment,the growth of grains and the segregation of reactive elements improve interface strength and inhibit the formation of micro-defects in the coating.The annealing temperature is of significance to the microstructure,mechanical properties,anti-corrosion and cavitation erosion resistance of the coating.This study provides a combined approach toward improving the corrosion and cavitation erosion resistance of NiCoCrAlYTa coatings.

关键词： iCoCrAlYTa coatings Annealing treatment Microstructure Mechanical properties Cavitation erosion

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Preparation of Cu-Ni bimetallic nanoparticles surface-capped with dodecanethiol and their tribological properties as lubricant additive

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Particuology 2017年第5期15卷 89-96页

作者： Lei Chen Haiyan Xu Haixia Cui huidi zhou Hongqi Wan Jianmin Chen State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Cu-Ni bimetallic nanoparticles surface-capped with dodecanethiol were prepared via the controlled reduction of nickel nitrate and copper nitrate in the presence of dodecanethiol as ligand and hydrazine hydrate as reductant. The morphology and structure of the Cu-Ni nanoparticles were analyzed by trans- mission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometry, and thermal gravimetric analysis. Furthermore, the tribological properties of the Cu-Ni nanoparticles as a lubricant additive in liquid paraffin were evaluated with a four-ball machine, and the morphology and elemental composition of the worn surfaces were analyzed by three-dimensional non-contact surface profilometry and X-ray photoelectron spectroscopy, respectively, The results indi- cated that Cu-Ni nanoparticles prepared at a sufficient dodecanethiol concentration showed almost no signs of aggregation, and exhibited good dispersibility in various apolar solvents. The addition of the Cu-Ni nanoparticles improved the load-carrying capacity as well as friction-reducing and anti-wear abilities of liquid paraffin, attributed to the roiling effect of agglomerated Cu-Ni nanocores released by the Cu-Ni nanoparticles during sliding, and the formation of a boundary lubricating film containing tribochemical reaction products such as iron oxides and iron sulfate.

关键词： Cu–Ni bimetallic nanoparticles Dodecanethiol Surface capping Tribological properties

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芪地糖肾方对糖尿病肾病足细胞焦亡及MAPK14/RELA/Caspase-8信号通路的影响

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中国实验方剂学杂志 2024年第13期30卷 67-75页

作者：高飞于博睿谢惠迪周盈史扬张先慧柳红芳北京市朝阳区中医医院北京100020 北京中医药大学东直门医院北京100700 中国人民解放军总医院北京100853 北京市普仁医院北京100062

目的:探讨芪地糖肾方(QDTS)调控糖尿病肾病(DN)足细胞焦亡的分子机制。方法:体内实验将db/db小鼠分为模型组、芪地糖肾方(3.34 g·kg^(-1))和缬沙坦胶囊(10.29 mg·kg^(-1))组,db/m小鼠作为正常组,每组8只,连续干预8周。末次给药后处死... 详细信息

目的:探讨芪地糖肾方(QDTS)调控糖尿病肾病(DN)足细胞焦亡的分子机制。方法:体内实验将db/db小鼠分为模型组、芪地糖肾方(3.34 g·kg^(-1))和缬沙坦胶囊(10.29 mg·kg^(-1))组,db/m小鼠作为正常组,每组8只,连续干预8周。末次给药后处死小鼠,观察小鼠肾脏病理变化及焦亡活性指标NOD样受体蛋白3(NLRP3)、Gasdermin D蛋白(GSDMD)和白细胞介素-1β(IL-1β)蛋白表达水平。体外实验将小鼠足细胞分为正常糖组(5.5 mmol·L^(-1)葡萄糖),高糖组(35 mmol·L^(-1)葡萄糖),二甲基亚砜(DMSO)组(35 mmol·L^(-1)葡萄糖+200 mg·L^(-1)DMSO)和QDTS组(35 mmol·L^(-1)葡萄糖+200 mg·L^(-1)芪地糖肾方冻干粉),干预48 h后检测足细胞中NLRP3、GSDMD和IL-1β蛋白的表达水平。使用网络药理学方法构建QDTS治疗DN的药物-成分-靶标-疾病交互网络,分析其调控足细胞焦亡的关键信号通路并在体内、体外实验进行验证。结果:与正常组比较,模型组小鼠肾小球肥大,肾小球基底膜增厚,部分节段伴有明显足细胞足突融合,小鼠肾脏中NLRP3、GSDMD和IL-1β蛋白表达升高,小鼠肾脏中丝裂原活化蛋白激酶14(MAPK14)、V-Rel网状内皮增生病毒癌基因同源物A(RELA)和胱天蛋白酶-8(Caspase-8)蛋白表达升高(P<0.05);与模型组比较,QDTS组小鼠肾脏病理损伤明显减轻,QDTS组和缬沙坦组小鼠肾脏中NLRP3、GSDMD和IL-1β蛋白表达降低(P<0.05),QDTS组和缬沙坦组小鼠肾脏中MAPK14、RELA、Caspase-8蛋白表达降低(P<0.05)。网络药理学结果显示QDTS调控DN细胞焦亡的靶点有16个,其中MAPK14、RELA和Caspase-8是关键靶点。与正常糖组比较,高糖组小鼠足细胞中NLRP3、GSDMD和IL-1β蛋白表达升高(P<0.05),小鼠足细胞中MAPK14、RELA和Caspase-8蛋白表达升高(P<0.05);与高糖组比较,QDTS组小鼠足细胞中NLRP3、GSDMD和IL-1β蛋白表达降低(P<0.05),QDTS组小鼠足细胞中MAPK14、RELA和Caspase-8蛋白表达降低(P<0.05)。结论:QDTS减轻DN足细胞损伤与其调控MAPK14/RELA/Caspase-8信号通路,抑制足细胞焦亡有关。

关键词：芪地糖肾方糖尿病肾病足细胞损伤焦亡分子机制

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负载α-常春藤皂苷聚合物胶束的制备与体内外评价

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药物评价研究 2024年第1期47卷 123-129页

作者：王慧弟张金坤郭进武汉中西医结合骨科医院(武汉体育学院附属医院)药学部湖北武汉430070 宜昌市中心人民医院药学部湖北宜昌443008 十堰市中医医院药剂科湖北十堰442012

目的制备α-常春藤皂苷(α-Hed)聚合物胶束(α-Hed-PMs),并评价其对HepG2细胞的抑制效果。方法以Pluronic F127和TPGS作为载体材料,采用溶剂蒸发-薄膜水化分散法将α-Hed制备成α-Hed-PMs,通过对粒径分布、Zeta电位和包封率进行综合... 详细信息

目的制备α-常春藤皂苷(α-Hed)聚合物胶束(α-Hed-PMs),并评价其对HepG2细胞的抑制效果。方法以Pluronic F127和TPGS作为载体材料,采用溶剂蒸发-薄膜水化分散法将α-Hed制备成α-Hed-PMs,通过对粒径分布、Zeta电位和包封率进行综合评估确定α-Hed-PMs的处方组成;测定α-Hed-PMs的临界胶束浓度;在透射电镜下观察α-Hed-PMs的微观形貌;通过差示扫描量热法(DSC)判断α-Hed在胶束中的存在状态;考察α-Hed-PMs在pH 5.0、6.0、7.4缓冲液中的稀释稳定性及释药速率;比较α-Hed原料药和α-Hed-PMs(4、8、16、32、64μg·mL^(-1))对HepG2细胞的体外抑制作用;制备HepG2细胞荷瘤小鼠,考察股静脉注射0.9%氯化钠溶液(对照组)、α-Hed和α-Hed-PMs(给药剂量均为30 mg·kg^(-1))对肿瘤体积的影响。结果 α-Hed-PMs的最优处方组成:Pluronic F127和TPGS质量比为6∶1,所形成的聚合物胶束临界胶束浓度为0.031 mg·mL^(-1);在透射电镜下可观察到α-Hed-PMs呈类球形分布;DSC测定结果显示α-Hed在胶束中以非结晶形式存在;α-Hed-PMs经pH 5.0、6.0、7.4缓冲液稀释后,在24 h内均未出现絮凝或沉淀,粒径也基本未发生改变;α-Hed原料药4 h基本释放完全,α-Hed-PMs在不同pH值缓冲液中均为前期药物释放较快,后期药物释放平缓,在50 h基本释放完全;体内外实验结果显示α-Hed-PMs对HepG2细胞的抑制作用均优于α-Hed原料药。结论以Pluronic F127和TPGS作为载体材料将α-Hed制备成α-Hed-PMs,可达到更好的抗肿瘤效果。

关键词： α-常春藤皂苷聚合物胶束临界胶束浓度抑瘤效果 HepG2细胞

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