检索结果-南通市图书馆

Surface characteristics and corrosion resistance of biodegradable magnesium alloy ZK60 modified by Fe ion implantation and deposition

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第5期24卷 547-553页

作者： Yang Zheng Yan Li Jihua Chen Zhengyang Zou School of Materials Science and Engineering Beihang University Key Laboratory of Aerospace Advanced Materials and Performance Beihang University Ministry of Education Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology Beihang University School of Materials Science and Engineering Hunan University

The ZK60 magnesium alloy has been modified by Fe ion implantation and deposition with a metal vapor vacuum arc plasma source. The surface morphology, phase constituent and elemental distribution are determined by scanning electron microscopy, transmission electron microscopy, X-ray diffractometer and Auger electron spectroscopy. The results show that Fe thin film is deposited on ZK60 alloy and the corresponding thickness increases from 2.73 μm to 6.36 μm with increasing deposition time. A transition layer mainly composed of Mg, Fe and O elements is formed between Fe thin film and ZK60 substrate. The potentiodynamic polarization tests reveal that a high corrosion potential and a low corrosion current density are detected for the Fe deposited ZK60 alloy, indicating the improvement of corrosion resistance. The tensile deformation test indicates that the Fe deposited film on the ZK60 substrate can sustain 1% tensile strain without any cracks.

关键词： biodegradable magnesium alloy Fe MEVVA Ion implantation and deposition Corrosion

biodegradable magnesium alloy as a new connecting material for iodine-125 brachytherapy:an initial experimental study in a rabbit VX2 model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Biodegradable magnesium alloy as a new connecting material f...

Improving corrosion resistance of additively manufactured WE43 magnesium alloy by high temperature oxidation for biodegradable applications

中国(第七届)肿瘤微创治疗学术大会暨世界影像导引下肿瘤微创治疗学会成立筹备大会

作者： Dong Chen1,Guang-feng Duan1,Yan-ling Zhang2,Sheng Peng1 Jian-jun Han1,Chuan-xing Li 1*,Fu-jun Zhang 1* 1.Department of Imaging and Interventional Radiology,Cancer Center of Sun Yat-sen University,Guangzhou,510060,People’s Republic of China 2.School of Biotechnology,Southern Medical University,Guangzhou 510515,People’s Republic of China

Objective To evaluate the in vivo degradation characteristics and tissue compatibility of new I125 seed chains connected with the biodegradable magnesium alloy AZ31 in New Zealand rabbits. Methods Thirty New Zealand rabbits were randomly divided into three *** group A,magnesium alloy radioactive I125 seeds chains were implanted into VX2 tumors;in group B,magnesium alloy non-radioactive I125 seeds chains were implanted into normal muscle;group C served as an untreated control *** mass loss of the AZ31 magnesium alloy connecting material was measured in the two groups at different time points after implantation of the I125 seed *** and histological changes at the implantation site and in organs were monitored using light microscopy,and seed displacement was assessed using regular X-ray and computed tomography(CT) *** and urine samples were collected from all experimental animals to measure changes in magnesium ion concentrations. Results The new 1125 seed chains made with AZ31 magnesium alloy began to degrade during the first week after *** day 21,the degradation rate was 81%in muscle tissue and 83%in tumor tissue;these degradation rates are not statistically *** after implantation,a mild local inflammatory response and gas production were induced;the gas disappeared 21 days after *** magnesium ion concentrations after implantation were relatively stable,but urine magnesium concentrations increased and fluctuated over a larger *** inspection of the liver,kidney,heart,and spleen of all animals implanted with 1125 seed chains revealed no significant *** 7 days after the implantation of magnesium alloy radioactive 1125 seed chains into tumors,the connecting material showed good connecting and fixing *** 21 days after implantation,the seeds had separated from each other,displacement had occurred,and the radioactive seeds had aggregated in concordance with

关键词： I125 radioactive stranded seeds biodegradable magnesium alloy VX2 tumor biocompatibility

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of magnesium and alloys 2024年第3期12卷 940-953页

作者： Jinge Liu Bangzhao Yin Fei Song Bingchuan Liu Bo Peng Peng Wen Yun Tian Yufeng Zheng Xiaolin Ma Caimei Wang State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopaedics Beijing Tsinghua Changgung HospitalInstitute for Precision MedicineTsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing AKEC Medical Co. Ltd.Beijing 102200China

Laser powder bed fusion(L-PBF)has been employed to additively manufacture WE43 magnesium(Mg)alloy biodegradable implants,but WE43 L-PBF samples exhibit excessively rapid *** this work,dense WE43 L-PBF samples were built with the relativity density reaching 99.9%.High temperature oxidation was performed on the L-PBF samples in circulating air via various heating temperatures and holding *** oxidation and diffusion at the elevated temperature generated a gradient structure composed of an oxide layer at the surface,a transition layer in the middle and the *** oxide layer consisted of rare earth(RE)oxides,and became dense and thick with increasing the holding *** matrix was composed ofα-Mg,RE oxides and Mg_(24)RE_(5) *** precipitates almost disappeared in the transition *** passivation effect was observed in the samples treated by a suitable high temperature *** original L-PBF samples lost 40%weight after 3-day immersion in Hank’s solution,and broke into fragments after 7-day *** casted and solution treated samples lost roughly half of the weight after 28-day *** high temperature oxidation samples,which were heated at 525℃ for 8 h,kept the structural integrity,and lost only 6.88%weight after 28-day *** substantially improved corrosion resistance was contributed to the gradient structure at the *** one hand,the outmost dense layer of RE oxides isolated the corrosive medium;on the other hand,the transition layer considerably inhibited the corrosion owing to the lack of ***,high temperature oxidation provides an efficient,economic and safe approach to inhibit the corrosion of WE43 L-PBF samples,and has promising prospects for future clinical applications.

关键词： Laser powder bed fusion biodegradable magnesium alloy High temperature oxidation Corrosion resistance WE43.

Electrochemical noise analysis on the pit corrosion susceptibility of biodegradable AZ31 magnesium alloy in four types of simulated body solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第10期34卷 1876-1884页

作者： changgang wang liping wu fang xue rongyao ma ini-ibehe nabuk etim xuehui hao junhua dong wei ke Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

magnesium alloys have been investigated as biodegradable implant materials since the last century. Non-uniform degradation caused by local corrosion limits their application, and no appropriate technology has been used in the research. In this study, electrochemical noise has been used to study the pit corrosion on magnesium alloy AZ31 in four types of simulated body solutions, and the data have been analyzed using wavelet analysis and stochastic theory. Combining these with the conventional polarization curves, mass loss tests and scanning electron microscopy, the electrochemical noise results implied that AZ31 alloy in normal saline has the fastest corrosion rate, a high pit initiation rate, and maximum pit growth probability. In Hanks＇ balanced salt solution and phosphate-buffered saline, AZ31 alloy has a high pit initiation rate and larger pit growth probability, while in simulated body fluid, AZ31 alloy has the slowest corrosion rate, lowest pit initiation rate and smallest pit growth probability.

关键词： biodegradable magnesium alloy Electrochemical noise (EN) Pit corrosion susceptibilities Wavelet analysis Stochastic model

Preparation and characterization of Ca-P coating on AZ31 magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2010年第B07期20卷 648-654页

作者：谭丽丽王强耿芳席小松邱剑红杨柯 Institute of Metal Research Chinese Academy of Sciences(Shenyang) School of Stomatology China Medical University(Shenyang) Trauson Medical Instrument Co Ltd

A Ca-P coating consisting of biodegradableβ-tricalcium phosphate[β-TCP,β-Ca3(PO4)2]accepted for medical application was coated on a biodegradable AZ31 alloy by chemical deposition to improve the corrosion *** good bonding strength of the coating is *** results show that the corrosion potential of the Ca-P coated AZ31 alloy increases significantly,and MG63 cells show good adherence,proliferation and differentiation on the surface of the coated *** Ca-P coating might be an effective way to improve the surface bioactivity of magnesium alloys.

关键词： biodegradable magnesium alloy β-TCP chemical deposition biocompatibility

Corrosion fatigue of the extruded Mg-Zn-Y-Nd alloy in simulated body fluid

在线全文

学校读者我要写书评

暂无评论

Journal of magnesium and alloys 2020年第1期8卷 231-240页

作者： Mengyao Liu Jianfeng Wang Shijie Zhu Yabo Zhang Yufeng Sun Liguo Wang Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced magnesium alloys Zhengzhou 450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of Education Zhengzhou 450002China

magnesium alloys were considered to be used as biodegradable implants due to their biocompatibility,biodegradability and ***,under the simultaneous action of corrosive environment and mechanical loading in human body,magnesium alloys are easy to be affected by corrosion fatigue and stress corrosion *** this work,the fatigue behavior of the extruded Mg-Zn-Y-Nd alloy used for vascular stents was studied both in air and in simulated body fluid(SBF).It was revealed that the fatigue limit of as-extruded Mg-Zn-Y-Nd alloy in air is about 65 MPa at 10^7 cycles,while there is no limit in SBF and shows a linear relationship between the fatigue life and stress *** fatigue crack source in air was formed by the inclusions and ***,the stress corrosion and hydrogen embrittlement are the main reasons for the formation of the fatigue initial crack source in SBF.

关键词： biodegradable magnesium alloy Corrosion fatigue Simulated body fluid Fatigue crack source

Effect of heat treatment on microstructure, mechanical properties and in vitro degradation behavior of as-extruded Mg-2.7Nd-0.2Zn-0.4Zr alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2012年第10期22卷 2343-2350页

作者：章晓波薛亚军王章忠南京工程学院材料科学与工程学院南京211167

Mg-2.7Nd-0.2Zn-0.4Zr （mass fraction, %） alloy was designed for degradable biomedical material. The ingots of the alloy were solution treated and then hot extruded. The extruded rods were heat treated with aging treatment, solution treatment and solution＋aging treatment, respectively. Microstructures of the alloy were observed by optical microscopy （OM） and scanning electron microscopy （SEM）. Mechanical properties at room temperature were tested. In vitro degradation behavior of the alloy immersed in simulated body fluid was measured by hydrogen evolution and mass loss tests. The degradation morphologies of the alloy with and without degradation products were observed by SEM. The results show that the grains grow apparently after solution treatment. Solution treatment improves the elongation of as-extruded alloy significantly and decreases the strength, while aging treatment improves the strength and reduces the elongation of the alloy. The yield ratio is reduced by heat treatment. The in vitro degradation results of the alloy show that solution treatment on the as-extruded alloy results in a little higher degradation rate and aging treatment on the alloy can reduce degradation rate slightly.

关键词： biodegradable magnesium alloy mechanical properties in vitro degradation behavior heat treatment