脉冲偏压对镍钛牙弓丝相变点温度的影响
脉冲偏压对镍钛牙弓丝相变点温度的影响
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深圳市海外高层次人才孔雀团队项目(KQTD2016030111500545);中国博士后科学基金资助项目(2017LH039)

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The Influence of Pulse Bias Frequency on the Transformation Temperature of Nickel Titanium Dental Arch Wire
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    摘要:

    错牙合畸形是世界各国均呈较高发病率的口腔疾病,表现为牙列、颌骨和颅面的畸形,口腔正畸是目前最有效的治疗方法。正畸牙弓丝是正畸治疗中的关键部件,而镍钛牙弓丝因具有形状记忆和超弹性性能在牙齿正畸中得到广泛使用。随着临床应用对牙弓丝提出新的性能需求,新型表面涂层也不断涌现。在镍钛牙弓丝表面引入氮化钛涂层可降低表面摩擦系数和摩擦力、提高耐磨性与生物安全性。物理气相沉积是工业上常用的氮化钛制备技术,但镍钛丝的相变点温度对周围环境温度变化敏感。为避免物理气相沉积过程中升温造成镍钛牙弓丝形状记忆效应和超弹性性能丢失,该研究将传统靶台上加载的直流偏压替换为脉冲式负偏压,可降低离子的注入沉积能量,为保留镍钛牙弓丝的优异力学性能创造条件。通过调整靶台加载负偏压的频率和占空比制备得到不同氮化钛涂层的镍钛牙弓丝,并比较其宏观和微观形貌、相变点温度发现,低频、低占空比处理条件制备的氮化钛涂层-镍钛牙 弓丝更适合于临床应用。

    Abstract:

    Patho-occlusion, which is characterized by the abnormalities of denture, jaw and craniofacial region, is an oral disease with high incidence in all countries. Orthodontics has been widely employed for the treatment of patho-occlusion, during which the nickel-titanium (NiTi) arch wires with shape memory and superelastic properties play a vital role. With the great development of manufacture technology and clinical applications, surface coatings such as titanium nitride (TiN) have been introduced onto the NiTi arch wires for lower frictional coefficient, better wear resistance and greater biocompatibility. In particular, physical vapor deposition (PVD) is the most common method for TiN coating, but the transformation temperature of target NiTi wires will be greatly affected during the conventional PVD process. Here in this study, the direct current bias of conventional PVD process was changed to pulsed negative bias for fabricating TiN coating, which could retain the shape memory and superelastic properties of target NiTi wires by avoiding temperature rise. Different TiN coated NiTi arch wires were prepared by adjusting the frequency and duty cycle of negative bias, and the morphology and transformation temperature of various samples were systematically investigated. The results reveal that the PVD process with lower frequency and duty cycle is more suitable for the preparation of TiN coated NiTi arch wires and better clinical applications can be anticipated.

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引文格式
童丽萍,傅劲裕,罗哲民,胡 楠,王怀雨.脉冲偏压对镍钛牙弓丝相变点温度的影响 [J].集成技术,2018,7(4):1-9

Citing format
TONG Liping, FU Jinyu, LUO Zhemin, HU Nan, WANG Huaiyu. The Influence of Pulse Bias Frequency on the Transformation Temperature of Nickel Titanium Dental Arch Wire[J]. Journal of Integration Technology,2018,7(4):1-9

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  • 在线发布日期: 2018-07-19
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