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通过阳极氧化法在Ti基体上垂直定向生长TiO2纳米管,其直径为60-80nm,长度为4μm。采用基体应变测试方法研究TiO2纳米管薄膜裂纹起源、扩展与饱和的情况。结果表明:退火可明显改善TiO2纳米管薄膜/Ti基体界面状况;随着拉伸应变的增加,裂纹扩展迅速加快,在很小的应变范围内达到饱和;TiO2纳米管薄膜室温样、250℃退火样和400℃退火样的界面剪切强度估算值分别为163.3、370.2和684.5MPa,临界能量释放率分别为49.6、102.6和392.7J/m2,断裂韧性分别为0.996、1.433和2.803MPa.m1/2。TiO2纳米管薄膜的界面结合机制为化学键结合。
The TiO2 nanotubes were vertically oriented on an Ti substrate by anodic oxidation, with a diameter of 60-80 nm and a length of 4 μm. The matrix strain test method was used to study the origin, propagation and saturation of the cracked TiO2 nanotube film. The results show that annealing can significantly improve the interface condition of TiO2 / Ti matrix. With the increase of tensile strain, the crack propagation accelerates quickly and reaches saturation in a small range of strain. TiO2 nanotubes film is annealed at 250 ℃ The calculated interfacial shear strength of the samples with the same annealing temperature of 400 ℃ were 163.3, 370.2 and 684.5 MPa respectively, the critical energy release rates were 49.6, 102.6 and 392.7 J / m2, respectively, and the fracture toughnesses were 0.996, 1.433 and 2.803 MPa.m1 / 2. The interfacial bonding mechanism of TiO2 nanotube films is chemical bonding.