研究了多孔NiTi记忆合金在H2O2＋HCl溶液中的低温化学氧化过程和500℃的高温热氧化过程。通过对比分析2种表面氧化处理后合金表面氧化膜的形貌、Ni/Ti比及膜层生长动力学曲线,探讨了多孔NiTi合金表面和孔内氧化膜的生长特点。结果表明,利用2种表面氧化技术在合金表面和孔内获得的氧化膜Ni含量均明显低于基体,且合金孔内氧化膜Ni含量低于表面氧化膜;多孔NiTi合金孔内的氧化对于与氧亲和力弱的Ni而言更加困难,孔内氧化膜的生长速率低于表面氧化膜的生长速率。
Two surface oxidation methods,i.e.,low temperature chemical oxidation in H2O2＋HCl solution and thermal oxidation at 500℃ were used to treat porous NiTi alloy for surface modification.The morphology,Ni/Ti atomic ratio and growth kinetics of the oxide films formed on porous NiTi alloy through two oxidation techniques were compared and analyzed.The characteristics of the oxidations on the surface and inside the pores of porous NiTi alloy were discussed.The results show that the two oxidation techniques bring about the formation of the oxide films depleted in Ni.The Ni content on the pore wall is lower than that on the surface of porous NiTi alloy,which indicates that the conditions inside the pores inhibit the oxidation of Ni due to the low oxygen affinity.The growth rate of the oxide film inside the pore is lower than that of the oxide film on the outmost surface of porous NiTi alloy.
参考文献
| [1] | Bansiddhi,A;Sargeant,TD;Stupp,SI;Dunand,DC .Porous NiTi for bone implants: A review.[J].Acta biomaterialia,2008(4):773-782. |
| [2] | 姜海昌,戎利建.多孔NiTi形状记忆合金中Ni的释放行为[J].金属学报,2008(02):198-202. |
| [3] | Liang FH.;Zhou L.;Wang KG. .Apatite formation on porous titanium by alkali and heat-treatment[J].Surface & Coatings Technology,2003(2):133-139. |
| [4] | Zhao, C.Y.;Zhu, X.D.;Yuan, T.;Fan, H.S.;Zhang, X.D. .Fabrication of biomimetic apatite coating on porous titanium and their osteointegration in femurs of dogs[J].Materials science & engineering, C. Biomimetic and supramolecular systems,2010(1):98-104. |
| [5] | 杨贤金,何菲,朱胜利,崔振铎,姚康德.化学修饰对NiTi形状记忆合金氧化膜的影响[J].功能材料,2002(02):169-171. |
| [6] | 胡涛,储成林,孙卫斌,王娟,周静艳,董寅生,浦跃朴,林萍华,朱剑豪.镍钛合金的高级氧化法表面改性及其血液相容性研究[J].稀有金属材料与工程,2007(06):1074-1077. |
| [7] | 丁仲如,秦永文.国产镍钛合金材料热氧化表面改性后组织相容性评价[J].第二军医大学学报,2007(05):495-499. |
| [8] | 肖帆,袁俊,王小祥.表面氧化对TiNi形状记忆合金耐腐蚀性能的影响[J].材料科学与工程,2000(01):40-42,18. |
| [9] | Pohl, M;Glogowski, T;Kuhn, S;Hessing, C;Unterumsberger, F.Formation of titanium oxide coatings on NiTi shape memory alloys by selective oxidation[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008:123-126. |
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