The as-spun Ti_(1−x)La_(x)Fe_(0.8)Mn_(0.2)(x=0,0.01,0.03,0.06,0.09,molar fraction)alloys were prepared by melt spinning.The effects of La substitution for Ti on the microstructure,hydrogen storage kinetics and thermod...The as-spun Ti_(1−x)La_(x)Fe_(0.8)Mn_(0.2)(x=0,0.01,0.03,0.06,0.09,molar fraction)alloys were prepared by melt spinning.The effects of La substitution for Ti on the microstructure,hydrogen storage kinetics and thermodynamics of TiFe-type Ti−Fe−Mn-based alloy were investigated.The as-spun alloys hold the TiFe single phase,which transforms to TiFeH_(0.06),TiFeH,and TiFeH_(2) hydrides after hydrogenation.La substitution promotes the formation of micro-defects(such as dislocations and grain boundaries)in the alloys,thus facilitating hydrogen diffusion.In addition,the hydrogen storage kinetics properties are improved after introducing La element.With the rise of La content,the hydrogen storage capacity decreases firstly and then increases,but the absolute value of hydriding enthalpy change(|ΔH|)increases firstly and then reduces.When x=0.01,the maximum value of|ΔH|is obtained to be(25.23±0.50)kJ/mol for hydriding,and the alloy has the maximum hydrogen absorption capacity of(1.80±0.04)wt.%under the conditions of 323 K and 3 MPa.展开更多
The Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xCox(x=0,1,2,3,4,%,mass fraction) were prepared by melt-spinning technology.The structures of the alloys were studied by XRD,SEM and HRTEM.The hydrogen absor...The Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xCox(x=0,1,2,3,4,%,mass fraction) were prepared by melt-spinning technology.The structures of the alloys were studied by XRD,SEM and HRTEM.The hydrogen absorption/desorption kinetics and the electrochemical performances of the alloys were measured.The results show that no amorphous phase forms in the as-spun Co-free alloy,but the as-spun alloys containing Co show a certain amount of amorphous phase.The hydrogen absorption capacities of the as-cast alloys first increase and then decrease with the incremental change of Co content.The hydrogen desorption capacities of as-cast and spun alloys rise with increasing Co content.The melt spinning significantly improves the hydrogenation and dehydrogenation capacities and kinetics of the alloys.The substitution of Co for Ni clearly enhances the discharge capacities of the alloys and the cycle stability of the as-spun alloys.展开更多
Reinforcement of TPNR （thermoplastic natural rubber） with cotton fibre spun was prepared by using hot compression moulding. The TPNR was prepared by mixing NR （natural rubber） with PE （polyethylene） using 2-roll...Reinforcement of TPNR （thermoplastic natural rubber） with cotton fibre spun was prepared by using hot compression moulding. The TPNR was prepared by mixing NR （natural rubber） with PE （polyethylene） using 2-roll mills before compressed on cotton fibre spun and vulcanized at 150℃. The mechanical properties and morphology of the membrane were investigated using DMTA （dynamic mechanical thermal analyzer） and SEM （scanning electron microscopy）, respectively. The membrane strength was increased from 10 MPa to 18 MPa after reinforced with cotton fibre spun as well as the increasing of dielectric constant. The membrane was immersed in xylene to remove PE phase before characterization of membrane properties.展开更多
基金financial supports from the Inner Mongolia Natural Science Foundation,China (No.2019BS05005)the Inner Mongolia University of Science and Technology Innovation Fund,China (No.2019QDL-B11)the National Natural Science Foundation of China (Nos.51901105, 51871125, 51761032).
文摘The as-spun Ti_(1−x)La_(x)Fe_(0.8)Mn_(0.2)(x=0,0.01,0.03,0.06,0.09,molar fraction)alloys were prepared by melt spinning.The effects of La substitution for Ti on the microstructure,hydrogen storage kinetics and thermodynamics of TiFe-type Ti−Fe−Mn-based alloy were investigated.The as-spun alloys hold the TiFe single phase,which transforms to TiFeH_(0.06),TiFeH,and TiFeH_(2) hydrides after hydrogenation.La substitution promotes the formation of micro-defects(such as dislocations and grain boundaries)in the alloys,thus facilitating hydrogen diffusion.In addition,the hydrogen storage kinetics properties are improved after introducing La element.With the rise of La content,the hydrogen storage capacity decreases firstly and then increases,but the absolute value of hydriding enthalpy change(|ΔH|)increases firstly and then reduces.When x=0.01,the maximum value of|ΔH|is obtained to be(25.23±0.50)kJ/mol for hydriding,and the alloy has the maximum hydrogen absorption capacity of(1.80±0.04)wt.%under the conditions of 323 K and 3 MPa.
基金Project(2006AA05Z132) supported by the National High-tech Research and Development Program of ChinaProjects(50871050,50701011) supported by the National Natural Science Foundation of China+1 种基金Project(200711020703) supported by Natural Science Foundation of Inner Mongolia,ChinaProject(NJzy08071) supported by High Education Science Research Program of Inner Mongolia,China
文摘The Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xCox(x=0,1,2,3,4,%,mass fraction) were prepared by melt-spinning technology.The structures of the alloys were studied by XRD,SEM and HRTEM.The hydrogen absorption/desorption kinetics and the electrochemical performances of the alloys were measured.The results show that no amorphous phase forms in the as-spun Co-free alloy,but the as-spun alloys containing Co show a certain amount of amorphous phase.The hydrogen absorption capacities of the as-cast alloys first increase and then decrease with the incremental change of Co content.The hydrogen desorption capacities of as-cast and spun alloys rise with increasing Co content.The melt spinning significantly improves the hydrogenation and dehydrogenation capacities and kinetics of the alloys.The substitution of Co for Ni clearly enhances the discharge capacities of the alloys and the cycle stability of the as-spun alloys.
文摘Reinforcement of TPNR （thermoplastic natural rubber） with cotton fibre spun was prepared by using hot compression moulding. The TPNR was prepared by mixing NR （natural rubber） with PE （polyethylene） using 2-roll mills before compressed on cotton fibre spun and vulcanized at 150℃. The mechanical properties and morphology of the membrane were investigated using DMTA （dynamic mechanical thermal analyzer） and SEM （scanning electron microscopy）, respectively. The membrane strength was increased from 10 MPa to 18 MPa after reinforced with cotton fibre spun as well as the increasing of dielectric constant. The membrane was immersed in xylene to remove PE phase before characterization of membrane properties.
