彭志坚
,
杨义勇
,
王成彪
,
付志强
金属学报
设计、制备了三个系列(不同Bi2O3与Sb2O3掺杂浓度)的ZnO基复合材料. 力学性能测试的结果表明, Bi含量(2%, 原子分数)保持不变, 随Sb含量(在合适的剂量范围内)的增大,由于基质ZnO晶粒减小, 陶瓷致密度增大, 所得材料的模量、抗弯强度以及断裂韧性均增大; Sb含量(3%, 原子分...
关键词:
ZnO
,
Dopants
,
Composite ceramic varistors
,
Mechanical properties
,
null
Wang Chang
,
Yu Zhentao
,
Cui Yajun
,
Zhang Yafeng
,
Yu Sen
,
Qu Gongqi
,
Gong Haibo
材料科学技术（英文）
doi:10.1016/j.jmst.2016.08.008
In recent years, zinc based alloys as a new biodegradable metal material aroused intensive interests. However, the processing of Zn alloys micro-tubes (named slender-diameter and thin-walled tubes) is very difficult due to their HCP crystal structure and unfavorable mechanical properties. This study aimed to develop a novel technique to produce micro-tube of Zn alloy with good performance for biodegradable vascular stent application. In the present work, a processing method that combined drilling, cold rolling and optimized drawing was proposed to produce the novel Zn-5Mg-1Fe (wt%) alloy micro-tubes. The micro-tube with outer diameter of 2.5?mm and thickness of 130?μm was fabricated by this method and its dimension errors are within 10?μm. The micro-tube exhibits a fine and homogeneous microstructure, and the ultimate tensile strength and ductility are more than 220?MPa and 20% respectively. In addition, the micro-tube and stents of Zn alloy exhibit superior in vitro corrosion and expansion performance. It could be concluded that the novel Zn alloy micro-tube fabricated by above method might be a promising candidate material for biodegradable stent.
关键词:
Zn alloy
,
Micro-tube
,
Biodegradable stent
,
Mechanical properties
,
Dimensional accuracy
,
In vitro corrosion performance
Wang C.
,
Yang H.T.
,
Li X.
,
Zheng Y.F.
材料科学技术（英文）
doi:10.1016/j.jmst.2016.06.003
In this work, three widely used commercial Zn alloys (ZA4-1, ZA4-3, ZA6-1) were purchased and prepared by hot extrusion at 200?°C. The microstructure, mechanical properties, corrosion behaviors, biocompatibility and hemocompatibility of Zn alloys were studied with pure Zn as control. Commercial Zn alloys demonstrated increased strength and superb elongation compared with pure Zn. Accelerated corrosion rates and uniform corrosion morphologies were observed in terms of commercial Zn alloys due to galvanic effects between Zn matrix and α-Al phases. 100% extracts of ZA4-1 and ZA6-1 alloys showed mild cytotoxicity while 50% extracts of all samples displayed good biocompatibility. Retardant cell cycle and inhibited stress fibers expression were observed induced by high concentration of Zn2+ releasing during corrosion. The hemolysis ratios of Zn alloys were lower than 1% while the adhered platelets showed slightly activated morphologies. In general, commercial Zn alloys possess promising mechanical properties, appropriate corrosion rates, significantly improved biocompatibility and good hemocompatibility in comparison to pure Zn. It is feasible to develop biodegradable metals based on commercial Zn alloys.
关键词:
Commercial Zn alloys
,
Biodegradable metals
,
Mechanical properties
,
Corrosion behaviors
,
Cytotoxicity
,
Hemocompatibility
Guimei WANG
,
Xigao JIAN
,
Gongxiong LIAO
,
Lihao WU
材料科学技术（英文）
Poly (phthalazinone ether sulfone ketone) (PPESK) was melt blended with bisphenol-A polysulfone oligomer (O-PSF) to produce a thermoplastic polymer blends. The miscibility, thermal stability, rheological and mechanical properties of the blends were investigated by scanning electron microscopy (SEM),...
关键词:
PPESK
,
null
,
null
,
null
,
null
,
null
