利用磁控溅射技术合成了Ti Ta O薄膜涂层。采用体外血小板粘附试验、动态凝血时间测定以及动物体内试片埋植试验等评价方法 ,对涂层的抗凝血特性进行了研究 ;并采用Tauc法研究了涂层的禁带宽度。研究结果表明 ,Ti Ta O薄膜涂层具有良好...利用磁控溅射技术合成了Ti Ta O薄膜涂层。采用体外血小板粘附试验、动态凝血时间测定以及动物体内试片埋植试验等评价方法 ,对涂层的抗凝血特性进行了研究 ;并采用Tauc法研究了涂层的禁带宽度。研究结果表明 ,Ti Ta O薄膜涂层具有良好的抗凝血特性以及禁带宽度为 3.2eV的半导体特性。此外 ,探讨了Ti Ta O涂层的抗凝血机理 ,并提出材料的半导体特性是影响Ti Ta O涂层抗凝血特性的主要原因之一。展开更多
The phase equilibria in Co-rich region of Co-Ti-Ta system were studied.The microstructure and XRD analysis together with EDS determination show that L12 type Co3Ti phase and Laves_C36_Co3Ta phase get equilibrium with ...The phase equilibria in Co-rich region of Co-Ti-Ta system were studied.The microstructure and XRD analysis together with EDS determination show that L12 type Co3Ti phase and Laves_C36_Co3Ta phase get equilibrium with α-Co phase from 1 000 to 1 200 ℃.The Co3Ti phase possesses a solubility of Ta higher than 10%,and the addition of Ta stabilizes the Co3Ti phase.The isothermal sections of the Co-Ti-Ta system in the Co-rich region at 1 000,1 100 and 1 200 ℃ were constructed according to the result.展开更多
In the present work,the microstructure features,martensitic transformation,mechanical properties and strain recovery characteristics of Ti-Ta based shape memory alloys were tailored by changing Hf contents.The single...In the present work,the microstructure features,martensitic transformation,mechanical properties and strain recovery characteristics of Ti-Ta based shape memory alloys were tailored by changing Hf contents.The singleα"martensite phase was dominated in Ti-Ta alloy with 2 at.%H f.Upon Hf content exceeded2 at.%,βphase started to appear.Moreover,the amount ofβphase gradually increased with Hf content increasing.The martensitic transformation temperatures continuously decreased with the increased Hf content,which was attributed to the rising of valence electron concentration.Meanwhile,Hf addition improved the thermal cycling stability of Ti-Ta alloys due to the suppression ofωprecipitation.The yield stress of Ti-Ta based alloys firstly decreased and then increased with Hf content increasing.In addition,the completely recoverable strain of 4%can be obtained in Ti-Ta alloy with 6 at.%Hf as a consequence of the higher critical stress for dislocation slip.Besieds,the Ti-Ta based alloy containing 8 at.%Hf had the superior superelasticity behavior with the fully recoverable strain of 2%at room temperature.展开更多
文摘利用磁控溅射技术合成了Ti Ta O薄膜涂层。采用体外血小板粘附试验、动态凝血时间测定以及动物体内试片埋植试验等评价方法 ,对涂层的抗凝血特性进行了研究 ;并采用Tauc法研究了涂层的禁带宽度。研究结果表明 ,Ti Ta O薄膜涂层具有良好的抗凝血特性以及禁带宽度为 3.2eV的半导体特性。此外 ,探讨了Ti Ta O涂层的抗凝血机理 ,并提出材料的半导体特性是影响Ti Ta O涂层抗凝血特性的主要原因之一。
基金Project (50771027) supported by the National Natural Science Foundation of China
文摘The phase equilibria in Co-rich region of Co-Ti-Ta system were studied.The microstructure and XRD analysis together with EDS determination show that L12 type Co3Ti phase and Laves_C36_Co3Ta phase get equilibrium with α-Co phase from 1 000 to 1 200 ℃.The Co3Ti phase possesses a solubility of Ta higher than 10%,and the addition of Ta stabilizes the Co3Ti phase.The isothermal sections of the Co-Ti-Ta system in the Co-rich region at 1 000,1 100 and 1 200 ℃ were constructed according to the result.
基金Project(LQ21E040004) supported by the Natural Science Foundation of Zhejiang Province,ChinaProject(2021-Z03) supported by the State Key Laboratory of Advanced Metals and Materials,China。
基金financially supported by the National Natural Science Foundation of China(Nos.51871080,51931004 and 51571073)the Talent Training Program for Shandong Province Higher Educational Youth Innovative Teams(2019)。
文摘In the present work,the microstructure features,martensitic transformation,mechanical properties and strain recovery characteristics of Ti-Ta based shape memory alloys were tailored by changing Hf contents.The singleα"martensite phase was dominated in Ti-Ta alloy with 2 at.%H f.Upon Hf content exceeded2 at.%,βphase started to appear.Moreover,the amount ofβphase gradually increased with Hf content increasing.The martensitic transformation temperatures continuously decreased with the increased Hf content,which was attributed to the rising of valence electron concentration.Meanwhile,Hf addition improved the thermal cycling stability of Ti-Ta alloys due to the suppression ofωprecipitation.The yield stress of Ti-Ta based alloys firstly decreased and then increased with Hf content increasing.In addition,the completely recoverable strain of 4%can be obtained in Ti-Ta alloy with 6 at.%Hf as a consequence of the higher critical stress for dislocation slip.Besieds,the Ti-Ta based alloy containing 8 at.%Hf had the superior superelasticity behavior with the fully recoverable strain of 2%at room temperature.
