Surface modification and machining of TiNi/TiNb-based alloys by electrical discharge machining

Hsieh, Shu-Feng; Lin, Ming-Hong; Chen, Sung-Long; Ou, Shih-Fu; Huang, Tyau-Song; Zhou, Xiao-Qian

doi:10.1007/s00170-015-8257-x

Cited by 27 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, the model graph shown in Figure 8 indicates that both significant parameters exhibited positive effects on the crater sizes. According to S. Hsieh et al, the discharge duration and peak current mainly determine the discharge energy for the spark generation [26]. Thus, an increase in both parameters can significantly intensify the localised heat energy.…”

Section: Crater Sizesmentioning

confidence: 99%

“…Figure 1 presents the schematic of electrical discharge pulses, which illustrates several critical EDC parameters such as the discharge duration, peak current, gap voltage, and pulse interval. With reference to the literature, the discharge duration and peak current have a significant influence on the material erosion process [25,26,27,28]. Moreover, both parameters have a direct influence on the discharge energy, which is the main factor with respect to heat energy generation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

Mansor

Azmi

Zain

et al. 2020

Heliyon

View full text Add to dashboard Cite

Nickel-titanium shape memory alloy (NiTi) has a unique capacity to restore its initial shape after deformation, which is highly applicable to orthopaedic implantations, especially for the minimization of invasive surgeries. The high nickel content of this alloy can lead to unfavourable effects on the human body upon dissolution; thus, a reliable barrier of coatings on the NiTi surface is required to alleviate the nickel migration and increase its biocompatibility. In this paper, analyses of a titanium oxide layer development on NiTi surface using electrical discharge coating (EDC) process is presented. The recast layer thickness, crater sizes, and surface roughness were characterized based on five parameters; polarity, discharge duration, pulse interval, peak current, and gap voltage. The results show that the discharge duration is the most significant parameter to influence all responses, followed by peak current. The surface characteristics of the EDC substrate is depending on the crater formations and is highly correlated with the discharge energy intensity. As a result, appropriate parametric conditions of the electrical discharge coating process can enhance the NiTi surface for future medical applications, without compromising the shape memory effect.

show abstract

Section: Crater Sizesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

Mansor

Azmi

Zain

et al. 2020

Heliyon

View full text Add to dashboard Cite

show abstract

“…Previous studies have shown that a thin surface layer of titanium oxide (2–20 nm) will naturally form on the surface of TiNi alloys, and this layer can act as a barrier to human body corrosion and chemical reactions to limit the diffusion of nickel ions [ 5 ]. However, this film is unstable in the human body’s complicated and volatile environment and can easily corrode and fall off the alloy material.…”

Section: Introductionmentioning

confidence: 99%

“…To study EDM’s surface characteristics, Hsieh et al [ 2 ] showed that the EDM process could successfully machine the ternary TiNiZr SMAs while ensuring its shape recovery ability. The recast layer generated on the machined surface can adhere to the substrate effectively by surface alloying, enhancing wear resistance [ 5 ]. Peng et al [ 3 ] have reported that EDM can form a nanoporous biocompatible layer on the surface of Ti-6Al-4V, which is conducive to cell growth and proliferation.…”

Section: Introductionmentioning

confidence: 99%

Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric

Zhu

Guo

et al. 2020

Micromachines

View full text Add to dashboard Cite

Titanium-nickel shape memory alloy (SMA) has good biomedical application value as an implant. Alloy corrosion will promote the release of toxic nickel ions and cause allergies and poisoning of cells and tissues. With this background, surface modification of TiNi SMAs using TiC-powder-assisted micro-electrical discharge machining (EDM) was proposed. This aims to explore the effect of the electrical discharge machining (EDM) parameters and TiC powder concentration on the machining properties and surface characteristics of the TiNi SMA. It was found that the material removal rate (MRR), surface roughness, and thickness of the recast layer increased with an increase in the discharge energy. TiC powder’s addition had a positive effect on increasing the electro-discharge frequency and MRR, reducing the surface roughness, and the maximum MRR and the minimum surface roughness occurred at a mixed powder concentration of 5 g/L. Moreover, the recast layer had good adhesion and high hardness due to metallurgical bonding. XRD analysis found that the machined surface contains CuO2, TiO2, and TiC phases, contributing to an increase in the surface microhardness from 258.5 to 438.7 HV, which could be beneficial for wear resistance in biomedical orthodontic applications.

show abstract

“…Researchers have found that a surface has good hydrophobic properties when its structural characteristics are composed of craters, bulges, micropores, and particles [13,14]. A new process of preparing hydrophobic surfaces with micropores through EDM is proposed in the present study on the basis of previous studies that have shown that the surface of Ni-Ti alloy machined through EDM is mostly composed of craters and bulges [15].…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics and Hydrophobicity of Ni-Ti Alloy through Magnetic Mixed Electrical Discharge Machining

Feng

Zhang

et al. 2019

Materials

View full text Add to dashboard Cite

Nickel–titanium (Ni-Ti) alloy has been selected as stent material given its good biocompatibility. In this study, experimental research on this material was conducted using magnetic field-assisted electrical discharge machining (EDM). The surface topography of the machined workpiece was analyzed with a scanning electron microscope (SEM). Hydrophobicity was measured by using an optical contact angle measuring instrument. The roughness values of different positions on the surface were measured using a TR200 roughness instrument. Results showed that the composite structure of solidification bulge–crater–pore–particle can be prepared on the surface of the Ni-Ti alloy through magnetic mixed EDM using suitable processing parameters. Moreover, the contact angle of the surface reaches 138.2°.

show abstract

Surface modification and machining of TiNi/TiNb-based alloys by electrical discharge machining

Cited by 27 publications

References 26 publications

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric

Surface Characteristics and Hydrophobicity of Ni-Ti Alloy through Magnetic Mixed Electrical Discharge Machining

Contact Info

Product

Resources

About