Cyclic Fatigue of Dental NiTi Instruments after Plasma Nitriding

Bumbálek, Michal; Joska, Zdeněk; Pokorny, Zdenek; Sedlák, Josef; Majerík, Jozef; Neumann, Vlastimil; Klíma, Karel

doi:10.3390/ma14092155

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…These microcracks are mostly perpendicular to the axis of the friction mechanism, and when they cross, the worn part, which has the shape of a thin shell, is torn off. These thin shells of material can be gradually crushed and turned into hard abrasive microparticles [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Analysis of Tribological Properties of Powdered Tool Steels M390 and M398 in Contact with Al2O3

et al. 2022

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The present article examines special steels used for the production of injection screws in the plastic industry, with a glass fiber content of up to 30%. Experimental materials, M390 and M398, are classified as tool steels, which are produced by powder metallurgy-HIP methods (hot isostatic pressing). The main goal of the presented paper is to propose the optimal tempered temperature of M398 steel and also to compare the tribological properties of both materials and to determine the degree of their wear depending on their final heat treatment. Partial results refer to the analysis of hardness, roughness, the overall wear mechanism, the change in the volume of retained austenite due to the tempering temperature, and the EDS analysis of the worn surfaces in individual contact pairs. A ceramic ball Al2O3 in the α phase was used as the contact material, which had a diameter of 6.35 mm. The ceramic ball performed a rotational movement on the experimental material surface at an elevated temperature of 200 °C using the dry ball-on-disk method. It was experimentally shown that the new M398 material can fully replace the M390 material because it exhibits significantly better tribological properties. The M398 material showed more than a 400% reduction in wear compared to the M390 material. The ideal heat treatment consisted of cryogenic quenching to −78 °C and a tempering temperature of 400 °C. At tempering temperatures of 200 and 400 °C, adhesive wear occurred, which was combined with abrasive wear at a tempered temperature of 600 °C. The averaged coefficient of friction (COF) results show that the M398 material presents less resistance in the friction process and its values are approximately 0.25, while the M390 material showed a COF value of 0.3 after the cryogenic hardening process. The friction surface roughness of the M398 materials also showed lower values compared to the M390 material by approximately 35%. Both of these results are related to the content of M7C3 and MC carbide particles based on Cr and V in the bulk of the material, which are in favor of the M398 material.

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Section: Resultsmentioning

confidence: 99%

Analysis of Tribological Properties of Powdered Tool Steels M390 and M398 in Contact with Al2O3

et al. 2022

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“…35,41,[47][48][49][50][51][52][53][54][55][56][57] Improvement of surface properties of NiTi alloys using surface nitriding processes like powder nitriding, gas nitriding, ion implantation, plasma nitriding, etc., have been extensively researched over the years. [58][59][60][61][62][63][64][65][66][67] Nitrided NiTi instruments such as plasma-nitrided NiTi dental files have been found to provide good fatigue performance and increased cyclic fatigue life.…”

Section: Properties Of Shape Memory Alloysmentioning

confidence: 99%

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

Nair

Radhika

2022

Proc Inst Mech Eng H

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The significance of advanced smart materials in recent technological research and advancement is apparent from its extensive use in present day devices and instruments. Of the various smart materials in use today, the fascinating category of shape memory alloys (SMAs) is equipped with the ability to return to a previously memorized shape under certain thermomechanical or magnetic stimuli. The unique property of shape memory effect and superelasticity displayed by these materials along with good biocompatibility and corrosion resistance make them ideal for biomedical applications. The various applications of SMAs in surgical instruments, surgical implants, and assistive and rehabilitative devices have significant effect on the day to day life of people in the present age. Majority of these biomedical devices belong to the orthodontic, orthopedic, or surgical fields. Other remarkable applications of SMAs such as in the production of prostheses and orthoses designed through the biomimetic approach are also highly influential in improving the quality of life. The present paper provides an overview of the various properties of shape memory alloys and their applications in the biomedical field over the years, that have had a significant impact on the realm of medical science.

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“…In general, nitriding as well as a ferritic nitrocarburizing belongs to category of "low-temperature"chemicalheat treatment technologies. During the process, at temperature chosen from range 300 -580 °C, nitrogen is introduced into the surface microstructure from nitriding atmosphere [3], [4]. The nitrogen creates hard nitrides and carbonitrides with iron and mainly with some alloying elements such as Cr, Mo, Al, V, W etc.…”

Section: Introductionmentioning

confidence: 99%

Modification of Diffusion Layers by Laser Shock Peening

Procházka¹,

Vilis²,

Dobrocký³

et al. 2023

Manufacturing Technology

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The article deals with a possibilities of an enhancement of functional properties of highly stressed components by specific combination of surface technology. Two surface technologies such as plasma nitriding and laser shock peening were selected for the experiment. Those technologies were applied upon steel 42CrMo4 frequently utilized in manufacturing of strained components. Properties obtained by applied surface technologies were tested by following experimental methods. The chemical composition was verified by optical emission spectrometer Tasman Q4 Bruker. The surface morphology was inspected by scanning electron microscope TESCAN MIRA 4. The microstructure of heat treated as well as of nitrided specimens was observed by opto-digital microscope Olympus DSX500i. The microhardness profiles were measured by microhardness tester LM247 AT LECO. The friction coefficient was tested on tribometer Bruker UMT-3 TriboLab. For an assessment of the surface wearresistance the profilometer Talysurf CLI 1000 and Contour GT were utilized. The experimental results show that although the proposed surface technology combination manifests itself to be disadvantageous, both technology LSP, as well as plasma nitriding, applied separately, can lead to a significant wear reduction.Wear-resistance Plasma nitriding Laser shock peening Highly stressed components

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Cyclic Fatigue of Dental NiTi Instruments after Plasma Nitriding

Cited by 9 publications

References 32 publications

Analysis of Tribological Properties of Powdered Tool Steels M390 and M398 in Contact with Al2O3

Analysis of Tribological Properties of Powdered Tool Steels M390 and M398 in Contact with Al2O3

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

Modification of Diffusion Layers by Laser Shock Peening

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