CAJ | 학술논문

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60-80 nm,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684.5 MPa,临界能量释放率分别为49.6、102.6和392.7 J/m2,断裂韧性分别为0.996、1.433和2.803 MPa·m1/2.TiO2纳米管薄膜的界面结合机制为化学键结合.
통과양겁양화법재Ti기체상수직정향생장TiO2납미관,기직경위60-80 nm,장도위4μm.채용기체응변측시방법연구TiO2납미관박막렬문기원、확전여포화적정황.결과표명:퇴화가명현개선TiO2납미관박막/Ti기체계면상황；수착랍신응변적증가,렬문확전신속가쾌,재흔소적응변범위내체도포화；TiO2납미관박막실온양、250℃퇴화양화400℃퇴화양적계면전절강도고산치분별위163.3、370.2화684.5 MPa,림계능량석방솔분별위49.6、102.6화392.7 J/m2,단렬인성분별위0.996、1.433화2.803 MPa·m1/2.TiO2납미관박막적계면결합궤제위화학건결합.
Vertically orientated TiO2 nanotube array with diameters ranging from 60 up to 80 nm and length of 4 μm was grown on titanium by anodization.Crack initiation,propagation and saturation were studied using the substrate straining test.The results show that annealing obviously modifies the interfaces.With the increase of tensile strain,cracks in TiO2 nanotube films propagate rapidly and reach the saturation within a narrow strain gap.Interracial shear strengths of TiO2 nanotube films without annealing,with 250 ℃annealing and with 400 ℃ annealing can be estimated as 163.3,370.2 and 684.5 MPa,respectively.The critical energy release rates of TiO2 nanotube films are calculated as 49.6,102.6 and 392.7 J/m2,respectively.The fracture toughnesses of TiO2 nanotube films are estimated as 0.996,1.433 and 2.803 MPa·m1/2,respectively.The interfacial bonding mechanism of TiO2 nanotube film is chemical bonding.