A new environmental friendly cutting brass containing stibium instead of lead was produced by casting and rolling. The microstructure was observed and the mechanical,dezincification and cutting properties were studied...A new environmental friendly cutting brass containing stibium instead of lead was produced by casting and rolling. The microstructure was observed and the mechanical,dezincification and cutting properties were studied. The results show that the white particles distribute in both grains and grain boundaries,and the particles are mainly intermetallics containing stibium. The tensile strength,yield strength and elongation percentage of half-hard Sb-brass is 461.72 MPa,213.3 MPa and 15.67%,respectively. Corresponding to HPb59-1 by the size as well as appearance of the chips and the mechanism of free-cutting,the cutting property of unleaded free-cutting Sb-brass is excellent. The unleaded Sb-brass has excellent dezincification corrosion resistance,and the average depth of longitudinal section is about 295.4 μm,while the average depth of lateral section is about 214.7 μm,and it is feasible to develop a new unleaded free-cutting Sb-brass.展开更多
Stibium(Sb)metal with high theoretic capacity,suitable negative working window and inexpensive nature are promising anode material for advanced aqueous alkaline batteries(AABs).However,the further development of Sb an...Stibium(Sb)metal with high theoretic capacity,suitable negative working window and inexpensive nature are promising anode material for advanced aqueous alkaline batteries(AABs).However,the further development of Sb anode is severely hindered by the low capacity and poor rate capability which is originated from deficient adsorption of[Sb(OH)_(4)]^(-)and its sluggish desolvation kinetics.Herein,a nitrogen doped carbon cages(NCCs)substrate is constructed as high capacity and rate capability anode by promoting the adsorption and following desolvation process of[Sb(OH)_(4)]^(-)via the enhanced attraction toward(OH)-in the solvated[Sb(OH)_(4)]^(-).Consequently,the designed Sb/NCCs anode delivers a high capacity of 627 m Ah g^(-1)with an average 95%Sb utilization,an outstanding coulombic efficiency(CE)of 95%and an impressive lifespan(>110 h).Meanwhile,the Ni_(3)Se_(2)//Sb/NCCs batteries show great capacity retention of 86.7%after 2000 cycles with an areal capacity of 0.52 m Ah cm^(-2).Implementation of the designed anode allows for the construction of Sb-based AABs with enhanced rate capability,energy density and cycling performance.展开更多
基金Projects (2006BRE03B02) supported by the Key Project of 11th Five-Year Plan of China
文摘A new environmental friendly cutting brass containing stibium instead of lead was produced by casting and rolling. The microstructure was observed and the mechanical,dezincification and cutting properties were studied. The results show that the white particles distribute in both grains and grain boundaries,and the particles are mainly intermetallics containing stibium. The tensile strength,yield strength and elongation percentage of half-hard Sb-brass is 461.72 MPa,213.3 MPa and 15.67%,respectively. Corresponding to HPb59-1 by the size as well as appearance of the chips and the mechanism of free-cutting,the cutting property of unleaded free-cutting Sb-brass is excellent. The unleaded Sb-brass has excellent dezincification corrosion resistance,and the average depth of longitudinal section is about 295.4 μm,while the average depth of lateral section is about 214.7 μm,and it is feasible to develop a new unleaded free-cutting Sb-brass.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110538)Dongguan Science and Technology of Social Development Program(No.20211800904642)+2 种基金the open research fund of Guangdong Provincial Key Laboratory of Distributed Energy Systems(No.2020DES2)Joint Science Foundation of Wuyi University and HK and Macao(2019WGALH14)Guangdong province innovation and strong school project(2020ZDZX2004)。
文摘Stibium(Sb)metal with high theoretic capacity,suitable negative working window and inexpensive nature are promising anode material for advanced aqueous alkaline batteries(AABs).However,the further development of Sb anode is severely hindered by the low capacity and poor rate capability which is originated from deficient adsorption of[Sb(OH)_(4)]^(-)and its sluggish desolvation kinetics.Herein,a nitrogen doped carbon cages(NCCs)substrate is constructed as high capacity and rate capability anode by promoting the adsorption and following desolvation process of[Sb(OH)_(4)]^(-)via the enhanced attraction toward(OH)-in the solvated[Sb(OH)_(4)]^(-).Consequently,the designed Sb/NCCs anode delivers a high capacity of 627 m Ah g^(-1)with an average 95%Sb utilization,an outstanding coulombic efficiency(CE)of 95%and an impressive lifespan(>110 h).Meanwhile,the Ni_(3)Se_(2)//Sb/NCCs batteries show great capacity retention of 86.7%after 2000 cycles with an areal capacity of 0.52 m Ah cm^(-2).Implementation of the designed anode allows for the construction of Sb-based AABs with enhanced rate capability,energy density and cycling performance.
