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Recent progress in self-repairing coatings for corrosion protection on magnesium alloys and perspective of porous solids as novel carrier and barrier
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作者 Yajie Yang Yufei Wang +5 位作者 Mei-Xuan Li Tianshuai Wang Dawei Wang Cheng Wang Min Zha Hui-Yuan Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第10期3585-3608,共24页
Featuring low density and high specific strength, magnesium(Mg) alloys have attracted wide interests in the fields of portable devices and automotive industry. However, the active chemical and electrochemical properti... Featuring low density and high specific strength, magnesium(Mg) alloys have attracted wide interests in the fields of portable devices and automotive industry. However, the active chemical and electrochemical properties make them susceptible to corrosion in humid, seawater, soil,and chemical medium. Various strategies have revealed certain merits of protecting Mg alloys. Therein, engineering self-repairing coatings is considered as an effective strategy, because they can enable the timely repair for damaged areas, which brings about long-term protection for Mg alloys. In this review, self-repairing coatings on Mg alloys are summarized from two aspects, namely shape restoring coatings and function restoring coatings. Shape restoring coatings benefit for swelling, shrinking, or reassociating reversible chemical bonds to return to the original state and morphology when coatings broken;function self-repairing coatings depend on the release of inhibitors to generate new passive layers on the damaged areas. With the advancement of coating research and to fulfill the demanding requirements of applications, it is an inevitable trend to develop coatings that can integrate multiple functions(such as stimulus response, self-repairing, corrosion warning,and so on). As a novel carrier and barrier, porous solids, especially covalent organic frameworks(COFs), have been respected as the future development of self-repairing coatings on Mg alloys, due to their unique, diverse structures and adjustable functions. 展开更多
关键词 Mg alloys COATINGS SELF-REPAIRING Corrosion protection porous solids
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In-situ building of multiscale porous NiFeZn/NiZn-Ni heterojunction for superior overall water splitting
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作者 Ya-xin LI Hong-xiao YANG +4 位作者 Qiu-ping ZHANG Tian-zhen JIAN Wen-qing MA Cai-xia XU Qiu-xia ZHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第9期2972-2986,共15页
The development of efficient nonprecious bifunctional electrocatalysts for water electrolysis is crucial to enhance the sluggish kinetics of the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).A sel... The development of efficient nonprecious bifunctional electrocatalysts for water electrolysis is crucial to enhance the sluggish kinetics of the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).A self-supporting,multiscale porous NiFeZn/NiZn-Ni catalyst with a triple interface heterojunction on nickel foam(NF)(NiFeZn/NiZn-Ni/NF)was in-situ fabricated using an electroplating-annealing-etching strategy.The unique multiinterface engineering and three-dimensional porous scaffold significantly modify the mass transport and electron interaction,resulting in superior bifunctional electrocatalytic performance for water splitting.The NiFeZn/NiZn-Ni/NF catalyst demonstrates low overpotentials of 187 m V for HER and 320 mV for OER at a current density of 600 mA/cm^(2),along with high durability over 150 h in alkaline solution.Furthermore,an electrolytic cell assembled with NiFeZn/NiZn-Ni/NF as both the cathode and anode achieves the current densities of 600 and 1000 m A/cm^(2) at cell voltages of 1.796 and 1.901 V,respectively,maintaining the high stability at 50 mA/cm^(2) for over 100 h.These findings highlight the potential of NiFeZn/NiZn-Ni/NF as a cost-effective and highly efficient bifunctional electrocatalyst for overall water splitting. 展开更多
关键词 NiFeZn alloy multiple interface porous structure DEalloyING overall water splitting
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Influence of solidification mode on pore structure of directionally solidified porous Cu-Mn alloy 被引量:9
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作者 蒋光锐 李言祥 刘源 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期88-95,共8页
By the directional solidification of metal-gas eutectic method(GASAR),porous Cu-Mn alloy with oriented pores was fabricated successfully.The variation of pore structure was studied by experiments.The results show th... By the directional solidification of metal-gas eutectic method(GASAR),porous Cu-Mn alloy with oriented pores was fabricated successfully.The variation of pore structure was studied by experiments.The results show that the pore structure is primarily dependent on the solidification mode(planar,columnar cellular,columnar dendritic,equiaxed dendritic),which is controlled by the solidification process.By numerical simulation,it is noted that along with solidification,the solidification mode of the alloy transforms from cellular to columnar dendritic and finally to equiaxed dendritic.Through increasing melt temperature and mold preheating,the range of equiaxed dendrite could be decreased,which helps to extend the region of oriented pore structure. 展开更多
关键词 porous Cu-Mn alloy solidification mode GASAR process metal-gas eutectic
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Phase transformation and damping behavior of lightweight porous TiNiCu alloys fabricated by powder metallurgy process 被引量:2
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作者 江鸿杰 柯常波 +2 位作者 曹姗姗 马骁 张新平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2029-2036,共8页
Porous TiNiCu ternary shape memory alloys (SMAs) were successfully fabricated by powder metallurgy method. The microstructure, martensitic transformation behavior, damping performance and mechanical properties of th... Porous TiNiCu ternary shape memory alloys (SMAs) were successfully fabricated by powder metallurgy method. The microstructure, martensitic transformation behavior, damping performance and mechanical properties of the fabricated alloys were intensively studied. It is found that the apparent density of alloys decreases with increasing the Cu content, the porous Ti50Ni40Cu10 alloy exhibits wide endothermic and exothermic peaks arisen from the hysteresis of martensitic transformations, while the porous Ti50Ni30Cu20 alloy shows much stronger and narrower endothermic and exothermic peaks owing to the B2-B19 transformation taking place easily. Moreover, the porous Ti50Ni40Cu10 alloy shows a lower shape recovery rate than the porous Ti50Ni50 alloy, while the porous Ti50Ni30Cu20 alloy behaves reversely. In addition, the damping capacity (or internal friction, IF) of the porous TiNiCu alloys increases with increasing the Cu content. The porous Ti50Ni30Cu20 alloy has very high equivalent internal friction, with the maximum equivalent internal friction value five times higher than that of the porous Ti50Ni50 alloy. 展开更多
关键词 porous TiNiCu alloys powder metallurgy martensitic transformation damping behavior
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Effect of gelcasting conditions on quality of porous Al-Cu alloy 被引量:1
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作者 袁海英 贾成厂 +4 位作者 王聪聪 常宇宏 张新新 Bekouche KARIMA 王召利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期2018-2026,共9页
The porous A1-Cu alloy was prepared by the gelcasting process. And the effects of gelcasting conditions, such as monomer, the volume ratio of cross-linker and monomer, dispersant and redox initiating system on the hei... The porous A1-Cu alloy was prepared by the gelcasting process. And the effects of gelcasting conditions, such as monomer, the volume ratio of cross-linker and monomer, dispersant and redox initiating system on the height, gelling time and the quality of green body were investigated. (It was found that the dispersant and monomer played significant roles in the height and quality of green bodies, respectively.) The optimal conditions were 10% monomer, 2% cross-linker, 0.2% initiator (volume fraction), and 1.2 g dispersant, in which the green body exhibited the best quality. The mechanisms of process conditions in eliminating the cracks and forming the pores of in the five stages were proposed. Mercury porosimetry provided a description of pore diameter ranging from 10 to 10000 nm and open porosity of 38.78 %. 展开更多
关键词 porous A1-Cu alloy non-aqueous gelcasting process conditions CRACK PORE
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Effects of ball milling time on porous Ti-3Ag alloy and its apatite-inducing abilities 被引量:3
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作者 侯乐干 李莉 郑玉峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1356-1366,共11页
Ti and Ag powders were mixed with different ball milling time (1, 2, 5 and 10 h) and sintered into porous Ti-3Ag alloys. The samples were treated with hydrothermal treatment, and their apatite-inducing abilities wer... Ti and Ag powders were mixed with different ball milling time (1, 2, 5 and 10 h) and sintered into porous Ti-3Ag alloys. The samples were treated with hydrothermal treatment, and their apatite-inducing abilities were further evaluated by immersion in modified simulated body fluid. The results indicate that the high surface energy brought by powder refinement leads to the decline of Ag, but promotes the oxidation of Ti during the sintering process. Meanwhile, the hydrothermal treated porous Ti-3Ag alloys prepared by the powders ball milled for 10 h possess the best apatite-inducing ability. 展开更多
关键词 porous Ti-3Ag alloy hydrothermal treatment apatite-inducing ability ball milling time
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Preparation and characterization of porous NiTi alloys synthesized by microwave sintering using Mg space holder 被引量:4
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作者 Tao LAI Ji-lin XU +5 位作者 Qi-fei XIAO Yun-xiang TONG Jun HUANG Jian-ping ZHANG Jun-ming LUO Yong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第2期485-498,共14页
To obtain the lightweight,high strength,and high damping capacity porous NiTi alloys,the microwave sintering coupled with the Mg space holder technique was employed to prepare the porous NiTi alloys.The microstructure... To obtain the lightweight,high strength,and high damping capacity porous NiTi alloys,the microwave sintering coupled with the Mg space holder technique was employed to prepare the porous NiTi alloys.The microstructure,mechanical properties,phase transformation behavior,superelasticity,and damping capacity of the porous NiTi alloys were investigated.The results show that the porous NiTi alloys are mainly composed of the B2 NiTi phase with a few B19'NiTi phase as the sintering temperature is lower than or equal to 900℃.With increasing the sintering temperature,the porosities of the porous NiTi alloys gradually decrease and the compressive strength increases first,reaching the maximum value at 900℃,and then decreases.With increasing the Mg content from 1 wt.%to 7 wt.%,the porosities of the porous NiTi alloys increase from 37.8%to 47.1%,while the compressive strength decreases from 2058 to 1146 MPa.Compared with the NH4HCO3 space holder,the phase transformation behavior of the porous NiTi alloys prepared with Mg space holder changes,and all of the compressive strength,superelasticity,shape memory effect and damping capacity are greatly improved. 展开更多
关键词 porous NiTi alloy microwave sintering Mg space holder SUPERELASTICITY damping capacity
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Oxidation behavior and mechanism of porous nickel-based alloy between 850 and 1000 °C 被引量:3
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作者 Yan WANG Yong LIU +2 位作者 Hui-ping TANG Wei-jie LI Chao HAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第7期1558-1568,共11页
The oxidation behavior and mechanism of a porous Ni?Cr?Al?Fe alloy in the temperature range from850to1000°Cwere investigated by optical microscopy,scanning electron microscopy(SEM)and energy dispersive spectrosco... The oxidation behavior and mechanism of a porous Ni?Cr?Al?Fe alloy in the temperature range from850to1000°Cwere investigated by optical microscopy,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS),X-raydiffraction(XRD)analyses and X-ray photoelectron spectroscopy(XPS).The results show that the oxidation kinetics at950and1000°C of this porous alloy is pseudo-parabolic type.Complex layers composed of external Cr2O3/NiCr2O4and internalα-Al2O3areformed on the surface of the oxidized porous alloys.γ?phases favor the formation of NiO/Cr2O3/NiCr2O4during the initial oxidation.Many fast diffusion paths contribute to the development of the oxide layers.The decrease of the open porosity and the permeabilitywith exposure time extending and temperature increasing can be controlled within a certain range. 展开更多
关键词 porous alloy high temperature oxidation KINETICS oxide layer DIFFUSION
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Ultrafine nano-scale Cu_(2)Sb alloy confined in three-dimensional porous carbon as an anode for sodium-ion and potassium-ion batteries 被引量:3
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作者 Dan Wang Qun Ma +3 位作者 Kang-hui Tian Chan-Qin Duan Zhi-yuan Wang Yan-guo Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第10期1666-1674,共9页
Ultrafine nano-scale Cu2Sb alloy confined in a three-dimensional porous carbon was synthesized using NaCl template-assisted vacuum freeze-drying followed by high-temperature sintering and was evaluated as an anode for... Ultrafine nano-scale Cu2Sb alloy confined in a three-dimensional porous carbon was synthesized using NaCl template-assisted vacuum freeze-drying followed by high-temperature sintering and was evaluated as an anode for sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).The alloy exerts excellent cycling durability(the capacity can be maintained at 328.3 mA·h·g^(-1) after 100 cycles for SIBs and 260 mA·h·g^(-1) for PIBs)and rate capability(199 mA·h·g^(-1) at 5 A·g^(-1) for SIBs and 148 mA·h·g^(-1) at 5 A·g^(-1) for PIBs)because of the smooth electron transport path,fast Na/K ion diffusion rate,and restricted volume changes from the synergistic effect of three-dimensional porous carbon networks and the ultrafine bimetallic nanoalloy.This study provides an ingenious design route and a simple preparation method toward exploring a high-property electrode for K-ion and Na-ion batteries,and it also introduces broad application prospects for other electrochemical applications. 展开更多
关键词 copper-antimony alloy ANODE porous carbon potassium-ion batteries sodium-ion batteries
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Fabrication of lotus-type porous Mg−Mn alloys by metal/gas eutectic unidirectional solidification 被引量:3
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作者 Can-xu ZHOU Yuan LIU +2 位作者 Hua-wei ZHANG Xiang CHEN Yan-xiang LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第6期1524-1534,共11页
Lotus-type porous Mg–xMn(x=0,1,2 and 3 wt.%)alloys were fabricated by metal/gas eutectic unidirectional solidification(the Gasar process).The effects of Mn addition and the fabrication process on the porosity,pore di... Lotus-type porous Mg–xMn(x=0,1,2 and 3 wt.%)alloys were fabricated by metal/gas eutectic unidirectional solidification(the Gasar process).The effects of Mn addition and the fabrication process on the porosity,pore diameter and microstructure of the porous Mg-Mn alloy were investigated.Mn addition improved the Mn precipitates and increased the porosity and pore diameter.With increasing hydrogen pressure from 0.1 to 0.6 MPa,the overall porosity of the Mg-2wt.%Mn ingot decreased from 55.3%to 38.4%,and the average pore diameter also decreased from 2465 to 312μm.Based on a theoretical model of the change in the porosity with the hydrogen pressure,the calculated results were in good agreement with the experimental results.It is shown that this technique is a promising method to fabricate Gasar Mg–Mn alloys with uniform and controllable pore structure. 展开更多
关键词 porous material Mg-Mn alloy POROSITY Gasar process directional solidification
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Role of Ag addition on microstructure,mechanical properties,corrosion behavior and biocompatibility of porous Ti-30 at%Ta shape memory alloys 被引量:4
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作者 Mustafa Khaleel IBRAHIM Safaa Najah SAUD +1 位作者 Esah HAMZAH Engku Mohamad NAZIM 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3175-3187,共13页
In the present study,the thermal,mechanical,and biological properties of xAg/Ti-30Ta(x=0,0.41,0.82 and 2.48 at%)shape memory alloys(SMAs)were investigated.The study was conducted using optical and scanning electron mi... In the present study,the thermal,mechanical,and biological properties of xAg/Ti-30Ta(x=0,0.41,0.82 and 2.48 at%)shape memory alloys(SMAs)were investigated.The study was conducted using optical and scanning electron microscopy(SEM),X-ray diffractometry(XRD),compression test,and shape memory testing.The xAg/Ti-Ta was made using a powder metallurgy technique and microwave-sintering process.The results revealed that the addition of Ag has a significant effect on the pore size and shape,whereas the smallest pore size of 11μm was found with the addition of 0.41 at%along with a relative density of 72%.The fracture stress and strain increased with the addition of Ag,reaching the minimum values around 0.41 at%Ag.Therefore,this composition showed the maximum stress and strain at fracture region.Moreover,0.82 Ag/Ti-Ta shows more excellent corrosion resistance and biocompatibility than other percentages,obtaining almost the same behaviour of the pure Ti and Ti-6Al-4V alloys,which can be recommended for their promising and potential response for biomaterial applications. 展开更多
关键词 porous xAg/Ti-Ta shape memory alloys(SMAs) microwave sintering process microstructure characteristics mechanical properties and corrosion behavior bioactivity
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Preparation of porous Ta-10%Nb alloy scaffold and its in vitro biocompatibility evaluation using MC3T3-E1 cells 被引量:2
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作者 Jing-lei MIAO Jue LIU +2 位作者 Hui-feng WANG Hai-lin YANG Jian-ming RUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第10期2053-2061,共9页
A highly porous Ta-10%Nb alloy was successfully prepared for tissue engineering via the methods of the sponge impregnation and sintering techniques.The porous Ta-10%Nb alloy offers the capability of processing a pore ... A highly porous Ta-10%Nb alloy was successfully prepared for tissue engineering via the methods of the sponge impregnation and sintering techniques.The porous Ta-10%Nb alloy offers the capability of processing a pore size of 300-600μm,a porosity of(68.0±0.41)%,and open porosity of(93.5±2.6)%.The alloy also shows desirable mechanical properties similar to those of cancellous bone with the elastic modulus and the comprehensive strength of(2.54±0.5)GPa and(83.43±2.5)MPa,respectively.The morphology of the pores in the porous Ta-Nb alloy shows a good interconnected three-dimension(3D)network open cell structure.It is also found that the rat MC3T3-E1 cell can well adhere,grow and proliferate on the porous Ta-Nb alloy.The interaction of the porous alloy on cells is attributed to its desirable pore structure,porosity and the great surface area.The advanced mechanical and biocompatible properties of the porous alloy indicate that this material has promising potential applications in tissue engineering. 展开更多
关键词 porous Ta-Nb alloy low elastic modulus pore structure in vitro evaluation
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In-situ hydrothermal synthesis of Ni−MoO_(2)heterostructure on porous bulk NiMo alloy for efficient hydrogen evolution reaction 被引量:3
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作者 Jian TANG Ji-lin XU +4 位作者 Liang-liang LI Yong-cun MA Zhi-guo YE Hong-yu LUO Jun-ming LUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第5期1598-1608,共11页
The Ni−MoO_(2) heterostructure was synthesized in suit on porous bulk NiMo alloy by a facile powder metallurgy and hydrothermal method.The results of field emission scanning electron microscopy(SEM),field emission tra... The Ni−MoO_(2) heterostructure was synthesized in suit on porous bulk NiMo alloy by a facile powder metallurgy and hydrothermal method.The results of field emission scanning electron microscopy(SEM),field emission transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS)reveal that the as-prepared electrode possesses the heterostructure and a layer of Ni(OH)_(2) nanosheets is formed on the surface of Ni−MoO_(2) electrode simultaneously after hydrothermal treatment,which provides abundant interface and much active sites,as well as much active specific surface area.The results of hydrogen evolution reaction indicate that the Ni−MoO_(2) heterostructure electrode exhibits excellent catalytic performance,requiring only 41 mV overpotential to reach the current density of 10 mA/cm^(2).It also possesses a small Tafel slope of 52.7 mV/dec and long-term stability of electrolysis in alkaline medium. 展开更多
关键词 hydrogen evolution reaction Ni−MoO_(2) heterostructure powder metallurgy porous bulk electrocatalyst NiMo alloy
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Spontaneous infiltration and wetting behaviors of a Zr-based alloy melt on a porous SiC substrate 被引量:1
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作者 Zhang Wen Li +1 位作者 Hong Li Hai-feng Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第7期817-823,共7页
The spontaaleous infiltration aald wetting behaviors of a Zr-based alloy melt on porous a SiC ceramic plate were studied using tile sessile drop metilod by continuous heating and holding for 1800 s at different temper... The spontaaleous infiltration aald wetting behaviors of a Zr-based alloy melt on porous a SiC ceramic plate were studied using tile sessile drop metilod by continuous heating and holding for 1800 s at different temperatures in a high-vacuum furnace. The results showed that tile Zr-based alloy melt could pastly infiltrate tile porous SiC substrate without pressure due to tile effect of capillary pressure. Wettability and infiltration rates increased witil increasing temperature, and interracial reaction products (ZrC0.7 and TiC) were detected in tile Zr-based alloy/SiC ceramic system, likely because of tile reaction of tile active elements Zr and Ti witil elemental C. Furtilelinore, tile redundant ele- ment Si diffused into tile alloy melt. 展开更多
关键词 spontaneous infiltration wetting interface porous SiC Zr-based alloy
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Pore structure and mechanical properties of directionally solidi ed porous aluminum alloys 被引量:1
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作者 Komissarchuk Olga Xu Zhengbin +2 位作者 Hao Hai Zhang Xinglu Vladimir Karpov 《China Foundry》 SCIE CAS 2014年第1期1-7,共7页
Porous aluminum alloys produced by the metal-gas eutectic method or GASAR process need to be performed under a certain pressure of hydrogen, and to carry over melt to a tailor-made apparatus that ensures directional s... Porous aluminum alloys produced by the metal-gas eutectic method or GASAR process need to be performed under a certain pressure of hydrogen, and to carry over melt to a tailor-made apparatus that ensures directional solidif ication. Hydrogen is driven out of the melt, and then the quasi-cylindrical pores normal to the solidif ication front are usually formed. In the research, the effects of processing parameters(saturation pressure, solidif ication pressure, temperature, and holding time) on the pore structure and porosity of porous aluminum alloys were analyzed. The mechanical properties of Al-Mg alloys were studied by the compressive tests, and the advantages of the porous structure were indicated. By using the GASAR method, pure aluminum, Al-3wt.%Mg, Al-6wt.%Mg and Al-35wt.%Mg alloys with oriented pores have been successfully produced under processing conditions of varying gas pressure, and the relationship between the f inal pore structure and the solidif ication pressure, as well as the inf luences of Mg quantity on the pore size, porosity and mechanical properties of AlMg alloy were investigated. The results show that a higher pressure of solidif ication tends to yield smaller pores in aluminum and its alloys. In the case of Al-Mg alloys, it was proved that with the increasing of Mg amount, the mechanical properties of the alloys sharply deteriorate. However, since Al-3%Mg and Al-6wt.%Mg alloys are ductile metals, their porous samples have greater compressive strength than that of the dense samples due to the existence of pores. It gives the opportunity to use them in industry at the same conditions as dense alloys with savings in weight and material consumption. 展开更多
关键词 porous aluminum alloys GASAR solidification pressure pore structure directional solidification
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Pore structure of porous Mg-1Mn-xZn alloy fabricated by metal–gas eutectic unidirectional solidification
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作者 Canxu Zhou Gangqiang Liang +3 位作者 Yuan Liu Huawei Zhang Xiang Chen Yanxiang Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第8期2137-2146,共10页
Lotus-type porous Mg-1 wt.% Mn-xZn(x = 0 wt.%, 1 wt.% and 2 wt.%) alloys were fabricated by metal–gas eutectic unidirectional solidification(the Gasar method). Effects of Zn addition and the fabrication process on th... Lotus-type porous Mg-1 wt.% Mn-xZn(x = 0 wt.%, 1 wt.% and 2 wt.%) alloys were fabricated by metal–gas eutectic unidirectional solidification(the Gasar method). Effects of Zn addition and the fabrication process on the porosity, pore diameter and microstructure of the porous Mg alloys were investigated. Zn addition from 0 wt.% to 1 wt.% and 2 wt.% to the Mg-1 wt.% Mn alloy decreased the porosity from41.2% to 36.9% and 35.8%, respectively, with the same preparation processing. In the lotus-type porous Mg-1 wt.%Mn-1 wt.%Zn alloy, the porosities and average pore diameters changed with hydrogen pressures from 0.1 to 0.6 MPa. Conical areas that were rich in elemental Zn existed below the directional pores, and precipitates were also found in conical areas. Homogeneous directional pores existed in the lower portion of the ingot, and coarser directional pores and finer non-directional pores formed in the upper part. A theoretical model of the change in porosity with hydrogen pressure agreed well with the calculated porosities in the steady bubble growing area. The compressive strength of Mg-1 wt.Mn-Zn alloys can be increased by around 20 MPa through rising Zinc content from 1 wt.% to 2 wt.%, which basically linearly decline with the increasing of porosity. This work provides the basis for Gasar Mg-Zn-Mn alloy synthesis in biological applications and shows that the Gasar process is a promising method to fabricate Mg-Zn-Mn alloys with directional pores and a controllable pore structure. 展开更多
关键词 porous material Mg-Mn-Zn alloy POROSITY Gasar Directional solidification
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Comparison of nickle release and cytocompatibility between porous and dense NiTi alloy
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作者 Ben-quan YU Wen-hui YUAN +6 位作者 Qiang XU Yun-fang-zi GU Ming-ming XIAO Guo-fu XU Zhou LI Zhu XIAO Zi-an XIAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第12期3814-3820,共7页
The porous NiTi(pNiTi)samples were produced by sintering evaporation using Ti−50.8Ni(at.%)gasatomized powders.The samples were analyzed by metallographic microscope and X-ray dispersive spectroscopy(XRD).A comparison ... The porous NiTi(pNiTi)samples were produced by sintering evaporation using Ti−50.8Ni(at.%)gasatomized powders.The samples were analyzed by metallographic microscope and X-ray dispersive spectroscopy(XRD).A comparison of nickel(Ni)release and cytocompatibility between pNiTi and dense NiTi(dNiTi)was made.The results showed that the pNiTi has good mechanical properties.Ni releases from pNiTi in vitro and in vivo are more serious than those form dNiTi.The proliferation and differentiation of cells cultured with the pNiTi extracting liquid are significantly worse,and the rate of early apoptosis is higher.In conclusion,pNiTi is mechanically similar to bone,but pNiTi releases more Ni and interferes with cell proliferation and differentiation.A significantly cautious approach should be adopted when using it as a medical implant. 展开更多
关键词 porous nitinol alloy mechanical property nickel release CYTOCOMPATIBILITY
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Effects of Mg content on pore structure and electrochemical corrosion behaviors of porous Al-Mg alloys
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作者 何文远 肖逸锋 +4 位作者 吴靓 许艳飞 钱锦文 贺跃辉 郑学军 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第10期2483-2491,共9页
Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with... Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with X-ray diffractometer, scanning electron microscope and electrochemical analyzer. The volume expansion ratio, open porosity and corrosion resistance in 3.5%(mass fraction) Na Cl aqueous solution of the alloys increase at first and then decrease with the increase of Mg content. The maxima of volume expansion ratio and open porosity are 18.3% and 28.1% for the porous Al-56%Mg(mass fraction) alloy, while there is the best corrosion resistance for the porous Al-37.5% Mg(mass fraction) alloy. The pore formation mechanism can be explained by Kirkendall effect, and the corrosion resistance can be mainly affected by the phase composition for the porous Al-Mg alloys. They would be of the potential application for filtration in the chloride environment. 展开更多
关键词 porous Al-Mg alloys reactive synthesis pore structure electrochemical corrosion behaviors
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Preparation of Ti-Ni Porous Alloys and Its Hydrogen Isotope Effects
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作者 周俊波 高丽萍 王奎升 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期449-451,共3页
Ti-Ni porous alloy was made from titanium and nickel powder mixture in equiatomic composition by combustion synthesis technique (self-propagation high temperature synthesis). The result analyzed by SEM and XRD shows t... Ti-Ni porous alloy was made from titanium and nickel powder mixture in equiatomic composition by combustion synthesis technique (self-propagation high temperature synthesis). The result analyzed by SEM and XRD shows that the alloy possesses high porosity (50%~70%), and mainly consists of TiNi phase as well as rare Ti_2Ni and TiNi_3 transition phase. Then it was activated, cracked and used as sorbent for hydrogen isotope separation. Through experiment investigation, it was discovered that the alloy is able to absorb hydrogen in very large quantities in the lattice thereof, but deuterium only very slightly or not at all, at temperatures up to 623 K, especially at temperatures from about 323 to 423 K. According to this characteristic, the Ti-Ni porous alloys may replace noble metal palladium(Pd) as used for hydrogen isotope separation and purification. Study illustrated that the technology would have a promising engineering application, such as being used for reprocessing Tokamak exhaust gases and producing high purity deuterium. 展开更多
关键词 Ti-Ni porous alloys combustion synthesis hydrogen isotope isotope separation high purity deuterium
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Influence of Ti Powder Characteristics on Combustion Synthesis of Porous NiTi Alloy
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作者 YonghuaLI V.E.Gunther 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第3期248-250,共3页
Porous NiTi shape memory alloy (SMA) is a novel biomedical material used for human hard tissue implant. The influence of elemental titanium powder characteristics such as powder morphology, particle size and specific ... Porous NiTi shape memory alloy (SMA) is a novel biomedical material used for human hard tissue implant. The influence of elemental titanium powder characteristics such as powder morphology, particle size and specific surface area (SSA) on the minimal ignition temperature, combustion temperature and final product of porous NiTi SMA fabricated by combustion synthesis method was investigated in this paper by scanning electron microscopy (SEM) and laser diffraction. The preliminary data indicated that the titanium powder characteristics had a strong effect on combustion synthesis of porous NiTi SMA. 展开更多
关键词 porous NiTi shape memory alloy Combustion synthesis Titanium powder characteristics
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