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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Temperature-modulated DSC study of phase transformations in nickel-titanium orthodontic wires
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Temperature-modulated DSC study of phase transformations in nickel-titanium orthodontic wires

机译：镍钛正畸丝相变的温度调制DSC研究

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Nickel-titanium archwire alloys are very important for clinical orthodontics because of their wide elastic range and excellent springback, along with their ability to deliver highly desirable light forces for tooth movement. Recently, nickel-titanium orthodontic alloys have been developed that possess shape memory over the temperature range of the oral environment, and these archwires have considerable promise for the clinical treatment of patients. The shape memory is associated with a reversible transformation from martensitic NiTi to austenitic NiTi that is completed at mouth temperature. While extensive conventional differential scanning calorimetry (DSC) studies have been performed on commercial nickel-titanium orthodontic wire alloys to characterize their phase transformation behavior, the present study is the first time that temperature-modulated DSC (TMDSC) has been used for this purpose. Two commercial nickel-titanium wires possessing shape memory were analyzed, along with a third commercial nickel-titanium wire lacking shape memory. The TMDSC analyses were generally performed from - 130 to 100 degreesC for both the heating and cooling cycles, since there can be differences in the processes and the temperature ranges for the forward and reverse transformations. Improved resolution of the phase transformations was achieved with the use of TMDSC, compared to conventional DSC, and the novel results indicate the complexity of the phase transformation processes. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 17]
机译：镍钛弓丝合金由于其宽的弹性范围和出色的回弹力以及为牙齿移动提供非常理想的轻力的能力，因此对临床正畸科非常重要。近来，已经开发出在口腔环境的温度范围内具有形状记忆的镍钛正畸合金，并且这些弓丝对于患者的临床治疗具有相当大的希望。形状记忆与从马氏体NiTi到奥氏体NiTi的可逆转变有关，该转变在口腔温度下完成。虽然已经对商用镍钛正畸线合金进行了广泛的常规差示扫描量热法（DSC）研究，以表征其相变行为，但本研究还是首次将温度调节DSC（TMDSC）用于此目的。分析了两条具有形状记忆的商业镍钛丝，以及第三条缺乏形状记忆的商业镍钛丝。由于进行正向和反向转化的过程和温度范围可能存在差异，因此在加热和冷却循环中，TMDSC分析通常在-130至100摄氏度下进行。与传统的DSC相比，使用TMDSC可以改善相变的分辨率，并且新颖的结果表明了相变过程的复杂性。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：17]

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