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纯钛微弧氧化膜制备工艺的优化*

Keywords: 无机非金属材料,纯钛,微弧氧化,公式评分法,电参数

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Abstract:

?优化了纯钛微弧氧化膜的制备工艺。将用优化后工艺制备的微弧氧化膜进行碱化处理,然后置于模拟体液(sbf)中培养,以观察其生物活性的优劣。采用正交设计法优化了实验方案,用综合评分法分析了氧化膜的孔隙率、孔密度和孔直径,确定最佳工艺条件为:正向电压400v,占空比60%,频率550hz,氧化时间25min。对在最佳工艺条件下制备的膜层进行了xrd、sem和eds测试,结果表明:优化工艺后生长的膜层由锐钛矿型的tio2组成,陶瓷层表面分布大量微孔,孔隙率为0.70×108,孔密度为12%,孔径约为3μm。经碱化处理的膜层置于模拟体液中培养14d后,膜层表面被生长出的类骨磷灰石完全覆盖,证明其具有良好的生物活性,且生长出的缺钙型磷灰石与人体自然骨成分相似。但是,随着培养时间的延长磷灰石层发生溶解。

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