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A super wear-resistant coating for Mg alloys achieved by plasma electrolytic oxidation and discontinuous deposition

Journal of Magnesium and Alloys 2023年第8期11卷 2939-2952页

作者： xixi Dong Mingxu Xia Feng wa.g Hailin Yang gang Ji E.A.Nyberg Shouxun Ji College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Brunel Centre for Advanced Solidification Technology(BCAST) Brunel University LondonUxbridge UB83PHUK School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Metallurgy and Materials University of BirminghamBirmingham B152TTUK State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Univ.Lille CNRSINRAECentrale LilleUMR 8207-UMET-UnitéMatériaux et TransformationsF-59000 LilleFrance Kaiser Aluminum Spokane ValleyWA 99216USA

Magnesium alloys are lightweight materials with great potential,and plasma electrolytic oxidation(PEO)is effective surface treatment for necessary improvement of corrosion resistance of magnesium ***,the∼14µm thick and rough PEO protection layer has inferior wear resistance,which limits magnesium alloys as sliding or reciprocating parts,where magnesium alloys have special advantages by their inherent damping and denoising properties and attractive *** a novel super wear-resistant coating for magnesium alloys was achieved,via the discontinuous sealing(DCS)of a 1.3µm thick polytetrafluoroethylene(PTFE)polymer layer with an initial area fraction(A_(f))of 70%on the necessary PEO protection layer by selective spraying,and the wear resistance was exceptionally enhanced by∼5500 times in comparison with the base PEO *** initial surface roughness(Sa)under PEO+DCS(1.54µm)was imperfectly 59%higher than that under PEO and conventional continuous sealing(CS).Interestingly,DCS was surprisingly 20 times superior for enhancing wear resistance in contrast to *** induced nano-cracks that splitted DCS layer into multilayer nano-blocks,and DCS also provided extra space for the movement of nano-blocks,which resulted in rolling friction and nano ***,DCS promoted mixed wear of the PTFE polymer layer and the PEO coating,and the PTFE layer(HV:6 Kg·mm^(−2),A_(f):92.2%)and the PEO coating(HV:310 Kg·mm^(−2),A_(f):7.8%)served as the soft matrix and the hard point,***,the dynamic decrease of Sa by 29%during wear also contributed to the super wear *** strategy of depositing a low-frictional discontinuous layer on a rough and hard layer or matrix also opens a window for achieving super wear-resistant coatings in other materials.

关键词： Magnesium alloy Coating Plasma electrolytic oxidation Discontinuous deposition Wear resistance Mechanism

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Synthesis of amorphous Pd-based nanocatalysts for efficient alcoholysis of styrene oxide and electrochemical hydrogen evolution

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Nano Research 2023年第4期16卷 4650-4655页

作者： Yiyao ge Jingjie ge Biao Huang xixi wa.g guigao Liu Xiang-Huan Shan Lu Ma Bo Chen guanghua Liu Songmo Du An Zhang Hongfei Cheng Qingbo wa Shiyao Lu Lujiang Li Qinbai Yun Kuo Yuan Qinxin Luo Zhichuan J.Xu Yonghua Du Hua Zhang Department of Chemistry City University of Hong KongHong KongChina Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong KongChina Shenzhen Research Institute City University of Hong KongShenzhen 518057China Department of Chemical and Biological Engineering HKUST Jockey Club Institute for Advanced Study&Energy InstituteThe Hong Kong University of Science and TechnologyHong KongChina School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Chemistry University of Science and Technology of ChinaHefei 230026China National Synchrotron Light Source II Brookhaven National LaboratoryUptonNew York 11973USA State Key Laboratory of New Ceramics&Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Amorphous nanomaterials with long-range disordered structures could possess distinct properties and promising applications,especially in catalysis,as compared with their conventional crystalline *** is imperative to achieve the controlled preparation of amorphous noble metal-based nanomaterials for the exploration of their phase-dependent ***,we report a facile wet-chemical reduction strategy to synthesize various amorphous multimetallic Pd-based nanomaterials,including PdRu,PdRh,and *** phase-dependent catalytic performances of distinct Pd-based nanomaterials towards diverse catalytic applications have been ***,the usage of PdRu nanocatalysts with amorphous and crystalline face-centered cubic(fcc)phases can efficiently switch the ring-opening route of styrene oxide to obtain different products with high selectivity through alcoholysis reaction and hydrogenation reaction,***,when used as an electrocatalyst for hydrogen evolution reaction(HER),the synthesized amorphous PdRh nanocatalyst exhibits low overpotential and high turnover frequency values,outperforming its crystalline fcc counterpart and most of the reported Pd-based HER electrocatalysts.

关键词： amorphous nanomaterials Pd-based nanocatalysts phase engineering of nanomaterials ring-opening reaction of styrene oxide electrocatalytic hydrogen evolution

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超声引导联合辅助技术与CT引导经皮热消融治疗邻近膈顶肝癌的安全性及近期疗效

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中华肝胆外科杂志 2020年第10期26卷 757-761页

作者：刘德林黄斌孙希希孔梓祥浙江中医药大学附属西溪医院杭州市西溪医院超声科杭州310023

目的比较超声引导联合辅助技术与CT引导经皮热消融治疗邻近膈顶肝癌的安全性及近期疗效。方法回顾性分析浙江中医药大学附属西溪医院2016年1月至2019年10月邻近膈顶肝癌经皮热消融治疗患者的临床资料。按引导方式不同分为超声引导联合... 详细信息

目的比较超声引导联合辅助技术与CT引导经皮热消融治疗邻近膈顶肝癌的安全性及近期疗效。方法回顾性分析浙江中医药大学附属西溪医院2016年1月至2019年10月邻近膈顶肝癌经皮热消融治疗患者的临床资料。按引导方式不同分为超声引导联合辅助技术组(超声引导组)和CT引导组,辅助技术包括超声造影、融合成像和人工腹水。统计消融术中及术后1周内的并发症,对比两种引导方式的安全性,术后1个月行增强CT或增强MRI检查以评估近期疗效。结果最终纳入52例患者,其中39例为初治患者,13例为复发患者(7例有手术切除史,6例有热消融史)。男性41例,女性11例,年龄38.0~76.0(57.3±10.0)岁,肿瘤大小12.0~46.0(30.7±8.8)mm。超声引导组患者34例,年龄38.0~73.0(56.6±10.2)岁,肿瘤大小17.0~46.0(30.6±8.7)mm;CT引导组患者18例,年龄39.0~76.0(58.1±9.8)岁,肿瘤大小12.0~45.0(30.9±9.2)mm。两组患者年龄、肿瘤大小差异均无统计学意义(P>0.05)。热消融术中及术后1周内,超声引导组有3例出现胸腔积液,CT引导组有8例出现胸腔积液、7例出现气胸,两组间差异有统计学意义(P0.05)。结论热消融治疗邻近膈顶的肝癌,两种引导方式有相似的近期疗效,但超声引导联合辅助技术较CT引导明显降低了胸部并发症的发生率。

关键词：癌,肝细胞 CT引导超声引导热消融

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