치과용 Ni-Ti합금의 표면특성에 미치는 Mo함량의 영향
Effects of Mo Content on Surface Characteristics of Dental Ni-Ti Alloys
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
Ni-Ti shape memory alloy for dental nerve treatment devices was prepared by adding Mo to Ni-Ti alloy to improve flexibility and fatigue fracture characteristics and simultaneously increase corrosion resistance. Surface properties of the alloy were evaluated. Microstructure analysis of the Ni-Ti-xMo alloy revealed that the amount of needle-like structure increased with increasing Mo content. The shape of the precipitate showed a pattern in which a long needle-like structure gradually disappeared and changed into a small spherical shape. As a result of XRD analysis of the Ni-Ti-xMo alloy, R-phase structure appeared as Mo was added. R-phase and B2 structure were mainly observed. As a result of DSC analysis, phase transformation of the Ti-Ni-Mo alloy showed a twostep phase change of B2-R-B19' transformation with two exothermic peaks and one endothermic peak. As Mo content increased, R-phase formation temperature gradually decreased. As a result of measuring surface hardness of the Ti-Ni-Mo alloy, change in hardness value due to the phase change tended to decrease with increasing Mo content. As a result of the corrosion test, the corrosion potential and pitting potential increased while the current density tended to decrease with increasing Mo content.
Abstract
Ni-Ti shape memory alloy for dental nerve treatment devices was prepared by adding Mo to Ni-Ti alloy to improve flexibility and fatigue fracture characteristics and simultaneously increase corrosion resistance. Surface properties of the alloy were evaluated. Microstructure analysis of the Ni-Ti-xMo alloy revealed that the amount of needle-like structure increased with increasing Mo content. The shape of the precipitate showed a pattern in which a long needle-like structure gradually disappeared and changed into a small spherical shape. As a result of XRD analysis of the Ni-Ti-xMo alloy, R-phase structure appeared as Mo was added. R-phase and B2 structure were mainly observed. As a result of DSC analysis, phase transformation of the Ti-Ni-Mo alloy showed a twostep phase change of B2-R-B19' transformation with two exothermic peaks and one endothermic peak. As Mo content increased, R-phase formation temperature gradually decreased. As a result of measuring surface hardness of the Ti-Ni-Mo alloy, change in hardness value due to the phase change tended to decrease with increasing Mo content. As a result of the corrosion test, the corrosion potential and pitting potential increased while the current density tended to decrease with increasing Mo content.
참고문헌 (12)
- Ahmad A. Madarati, "Management of Intracanal Separated Instruments", Journal of Endodontics, 39(5), pp.569~581 (2013), Elsevier BV[DOI]
- B SATTAPAN, "Defects in Rotary Nickel-Titanium Files After Clinical Use", Journal of Endodontics, 26(3), pp.161~165 (2000), Ovid Technologies (Wolters Kluwer Health)[DOI]
- Ove A. Peters, "Effect of Immersion in Sodium Hypochlorite on Torque and Fatigue Resistance of Nickel-Titanium Instruments", Journal of Endodontics, 33(5), pp.589~593 (2007), Elsevier BV[DOI]
- X WEI, "Modes of Failure of ProTaper Nickel–Titanium Rotary Instruments after Clinical Use", Journal of Endodontics, 33(3), pp.276~279 (2007), Elsevier BV[DOI]
- M. Frost, "Experimentally validated constitutive model for NiTi-based shape memory alloys featuring intermediate R-phase transformation: A case study of Ni48Ti49Fe3", Materials & Design, 203, pp.109593~ (2021), Elsevier BV[DOI]
- Bo Feng, "In-situ synchrotron high energy X-ray diffraction study of micro-mechanical behaviour of R phase reorientation in nanocrystalline NiTi alloy", Acta Materialia, 194, pp.565~576 (2020), Elsevier BV[DOI]
- F. Seifried, "Structure, morphology and selected mechanical properties of magnetron sputtered (Mo, Ta, Nb) thin films on NiTi shape memory alloys", Surface and Coatings Technology, 347, pp.379~389 (2018), Elsevier BV[DOI]
- Bolu Liu, "Influence of Mo addition on the microstructure and mechanical properties of TiC-NiTi cermets", Journal of Alloys and Compounds, 712, pp.579~587 (2017), Elsevier BV[DOI]
- Orsure W. Stokes, "Corrosion in stainless-steel and nickel-titanium files", Journal of Endodontics, 25(1), pp.17~20 (1999), Elsevier BV[DOI]
- Y.C. Lu, "A bipolar model of the passivity of stainless steels—II. The influence of aqueous molybdate", Corrosion Science, 29(7), pp.863~880 (1989), Elsevier BV[DOI]
- 김영식, "Synergistic Effect of Nitrogen and Molybdenum on Localized Corrosion of Stainless Steels", CORROSION SCIENCE AND TECHNOLOGY, 9(1), pp.20~28 (2010), 한국부식방식학회
- Gülşah Uslu, "Effect of Dynamic Immersion in Sodium Hypochlorite and EDTA Solutions on Cyclic Fatigue Resistance of WaveOne and WaveOne Gold Reciprocating Nickel-titanium Files", Journal of Endodontics, 44(5), pp.834~837 (2018), Elsevier BV[DOI]