Formation and biocorrosion behavior of Zr-Al-Co-Nb bulk metallic glasses  

作　　者：LU XuYang HUANG Lu PANG ShuJie ZHANG Tao 

机构地区：[1]Key Laboratory of Aerospace Materials and Performance （Ministry of Education）, School of Materials Science and Engineering, BeihangUniversity, Beijing 100191, China

出　　处：《Chinese Science Bulletin》2012年第14期1723-1727,共5页

基　　金：supported by the National Natural Science Foundation of China (51161130526 and 50771005);the Innovation Foundation of Beihang University (BUAA) for PhD Graduates (special program for DSAE)

摘　　要：Ni-and Cu-free Zr-Al-Co-Nb glassy alloys with different Nb and Co contents were synthesized by melt spinning and copper mold casting.The effects of Nb addition to partially replace Co in the Zr55Al20Co25 glassy alloy on the glass-forming ability,thermal properties,in-vitro biocorrosion behavior and surface wettability of the metallic glasses were investigated.Although addition of Nb up to 5 at.% slightly decreased the supercooled liquid region and the glass-forming ability(GFA),the alloys could be casted in a bulk glassy rod form with diameters up to 3mm.The Zr-Al-Co-Nb glassy alloys were spontaneously passivated with low passive current densities in phosphate buffered saline and Hanks' solution.Substitution of "toxic" Co by Nb is effective in improved the corrosion resistance of the Zr-Al-Co glassy alloy.Water contact angle measurements showed that Nb addition increased the hydrophilicity of the glassy alloys,which may enhance cell adhesion of the alloys in biomedical applications.Ni- and Cu-free Zr-Al-Co-Nb glassy alloys with different Nb and Co contents were synthesized by melt spinning and copper mold casting. The effects of Nb addition to partially replace Co in the Zr55Al20Co25 glassy alloy on the glass-forming ability, thermal properties, in-vitro biocorrosion behavior and surface wettability of the metallic glasses were investigated. Although addition of Nb up to 5 at.% slightly decreased the supercooled liquid region and the glass-forming ability （GFA）, the alloys could be casted in a bulk glassy rod form with diameters up to 3 mm. The Zr-Al-Co-Nb glassy alloys were spontaneously passivated with low passive current densities in phosphate buffered saline and Hanks＇ solution. Substitution of ＂toxic＂ Co by Nb is effective in improved the corrosion resistance of the Zr-Al-Co glassy alloy. Water contact angle measurements showed that Nb addition increased the hydrophilicity of the glassy alloys, which may enhance cell adhesion of the alloys in biomedical applications.

关 键 词：大块金属玻璃 腐蚀行为 生物 玻璃形成能力 铌 非晶合金 锆 铝 

分 类 号：TG171[金属学及工艺—金属表面处理]