对应口腔环境中 p H值发生明显变化以及形成龋齿的自然现象 ,采用加速试验法研究了新型钛合金在不同 p H值乳酸中浸泡的耐腐蚀性能。研究表明当 p H=4即酸性略高于龋齿发病时酸性条件下 ,新型牙科钛合金能够完全耐乳酸腐蚀。在乳酸中腐...对应口腔环境中 p H值发生明显变化以及形成龋齿的自然现象 ,采用加速试验法研究了新型钛合金在不同 p H值乳酸中浸泡的耐腐蚀性能。研究表明当 p H=4即酸性略高于龋齿发病时酸性条件下 ,新型牙科钛合金能够完全耐乳酸腐蚀。在乳酸中腐蚀形式以点蚀为主 ,且随酸性增强有向晶间腐蚀转变的趋势。ICP分析表明合金在乳酸中的溶解析出物主要是 Fe,Fe的加入不利于合金的耐腐蚀性能。热力学计算表明设计的新型钛合金氧化膜含有 Mn2 O3、Nb2 O5、Zr O2 和 Ti O2 中的全部或部分 ,XPS分析表明氧化膜中的确含有 Mn2 O3、Nb2 O5和 Ti O2 ,主要是 Ti O2 。这三种氧化物致密且 Ti O2 和 Nb2 O5耐腐蚀 ,有利于合金的耐腐蚀性能。展开更多
Double glow plasma surface metallurgy technique was used to fabricate a Fe?Al?Cr?Nb alloyed layer onto the surface of the 45 steel. The microstructures and composition of th?eA Fl?eCr?Nb alloyed layer were analyzed by...Double glow plasma surface metallurgy technique was used to fabricate a Fe?Al?Cr?Nb alloyed layer onto the surface of the 45 steel. The microstructures and composition of th?eA Fl?eCr?Nb alloyed layer were analyzed by scanning electronic microscopy, X-ray diffraction and energy dispersive spectroscopy. The results indicate thatthe 20 μm alloyed layer is homogeneous and compact. The alloyed elements exhibit a gradient distribution along the cross section. Microhardness and nanoindentation tests imply that the surface hardness of the alloyed layer reaches HV 580, which is almost 2.8 times that of the substrate. Compared with the substrate, the alloyed layer has a much smaller displacement and a larger elastic modulus. According to the friction and wear tests at room temperature, the? FeAl?Cr?Nb alloyed layer has lower friction coefficient and less wear mass, implying that the Fe?Al?Cr?Nb alloyed layer can effectively improve the surface hardness and wear resistance of the substrate.展开更多
文摘对应口腔环境中 p H值发生明显变化以及形成龋齿的自然现象 ,采用加速试验法研究了新型钛合金在不同 p H值乳酸中浸泡的耐腐蚀性能。研究表明当 p H=4即酸性略高于龋齿发病时酸性条件下 ,新型牙科钛合金能够完全耐乳酸腐蚀。在乳酸中腐蚀形式以点蚀为主 ,且随酸性增强有向晶间腐蚀转变的趋势。ICP分析表明合金在乳酸中的溶解析出物主要是 Fe,Fe的加入不利于合金的耐腐蚀性能。热力学计算表明设计的新型钛合金氧化膜含有 Mn2 O3、Nb2 O5、Zr O2 和 Ti O2 中的全部或部分 ,XPS分析表明氧化膜中的确含有 Mn2 O3、Nb2 O5和 Ti O2 ,主要是 Ti O2 。这三种氧化物致密且 Ti O2 和 Nb2 O5耐腐蚀 ,有利于合金的耐腐蚀性能。
基金Project(51371097)supported by the National Natural Science Foundation of ChinaProject supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘Double glow plasma surface metallurgy technique was used to fabricate a Fe?Al?Cr?Nb alloyed layer onto the surface of the 45 steel. The microstructures and composition of th?eA Fl?eCr?Nb alloyed layer were analyzed by scanning electronic microscopy, X-ray diffraction and energy dispersive spectroscopy. The results indicate thatthe 20 μm alloyed layer is homogeneous and compact. The alloyed elements exhibit a gradient distribution along the cross section. Microhardness and nanoindentation tests imply that the surface hardness of the alloyed layer reaches HV 580, which is almost 2.8 times that of the substrate. Compared with the substrate, the alloyed layer has a much smaller displacement and a larger elastic modulus. According to the friction and wear tests at room temperature, the? FeAl?Cr?Nb alloyed layer has lower friction coefficient and less wear mass, implying that the Fe?Al?Cr?Nb alloyed layer can effectively improve the surface hardness and wear resistance of the substrate.
