Effects of Wire EDM on the Microstructure of P/M Titanium Samples

Viskić, Joško; Schauperl, Zdravko; Ćatić, Amir; Balog, Martin; Krížik, Peter; Gržeta, Biserka; Popović, Jasminka; Ortolan, Slađana Milardović; Mehulić, Ketij

doi:10.15644/asc48/4/6

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…[1][2][3][4][5] In prosthetic dentistry, both forms of titanium have been used to fabricate removable dental prostheses, frameworks for metal-ceramic fixed dental prostheses (FDPs), and implant-supported prostheses by using different fabrication techniques, including the conventional casting technology, computer-aided design and computer-aided manufacturing (CAD-CAM), electric discharge machining (EDM), and selective laser melting (SLM). [6][7][8][9][10][11][12] However, the casting of titanium and its alloys when used in metal-ceramic FDPs remains a challenge because of their high melting temperature (1672 °C) and extreme chemical reactivity with elements in the investment such as oxygen at high temperatures. 2,4,13 This resulted in the development of a thick layer (α-case) on the titanium surface containing mainly titanium oxides.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface treatment and thermocycling on porcelain bonding to two forms of titanium

Radwan

Attia

ilhamy

et al. 2023

Egyptian Dental Journal

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Statement of problem.Porcelain fracture or chipping are considered a frequent clinical problem of titanium-ceramic restorations. Although titanium-ceramic bonding remains a challenge, data on the influence of surface treatment on titanium-ceramic bonding are lacking.Purpose. The purpose of this in vitro study was to investigate the influence of surface treatment and thermocycling on porcelain bonding to two forms of titanium.Material and methods. Forty titanium specimens (25x3x0.5 mm) were machined by using wire-cut electric discharge machining (WEDM) technology and assigned into two groups as per the material form (n=20): Cp Ti grade 2 and Ti-6Al-4V alloy. The specimens in each group were further assigned into two subgroups (n=10) as per the tested surface treatment: airborne-particle abrasion and hydrochloric acid etching treatment. In addition, Ni-Cr alloy specimens (n=10) were provided as a control. Ultra-low fusing porcelain was applied at the center of the treated titanium specimens. Half of the titanium specimens in each subgroup (n=5) were subjected to thermocycling (5000 cycles). Flexural bond strength measurements for all specimens were determined by using a universal testing machine at a crosshead speed of 0.5 mm/min. A representative specimen from each group was observed by using a scanning electron microscope at ×200 magnification. Data were analyzed statistically by using 2-way ANOVA and the Student-Newman-Keuls (SNK) post hoc tests (α=.05). Results.No statistically significant difference in bond strength was found between both forms of titanium and the control group (P=.805). The mean and ±SD bond strength values (before and after thermocycling) ranged from 44 ±2 MPa to 48 ±4 MPa. In addition, the effect of surface treatment and thermocycling on porcelain bonding to both forms of titanium was not statistically significant (P=.481 and .864). The SNK post hoc tests showed no significant difference between the Cp Ti grade 2 and Ti-6Al-4V alloy specimens (P>.05).Conclusions. The bond strength of both forms of titanium (Cp Ti grade 2 and Ti-6Al-4V alloy) to ultra-low fusing porcelain was comparable to that of the control group. Both airborne-particle (1398)

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Section: Introductionmentioning

confidence: 99%

Influence of surface treatment and thermocycling on porcelain bonding to two forms of titanium

Radwan

Attia

ilhamy

et al. 2023

Egyptian Dental Journal

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“…A significant advantage is that due to the diffusion of electrode material into the substrate and vice versa relatively good bonding between the layer and the substrate occurs. ESD method enables to use titanium and titanium alloys (thanks to increase of their surface hardness and wear resistance) as sonotrode cutting tools [10] and also for biomedical applications in tooth impacts [11]. In this paper, the wear properties of TiB 2 and TiB 2 -Ti composites with 15 and 20 % Ti, under various applied loads are presented.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and tribological properties of TiB2-Ti composites prepared by spark plasma sintering

Puchý¹,

Kováčik²,

Kovalčíková³

et al. 2020

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The TiB2-Ti composites with different concentrations of the Ti metallic second phase were prepared by the spark plasma sintering. We investigated the tribological properties of TiB2 and TiB2-Ti materials by ball-on-disc technique on the HTT CSM tribometer under loads of 1, 5, and 10 N. The wear tracks morphology was investigated by scanning electron and confocal microscopy. The microstructures of the TiB2 + Ti materials consist of a small-grained matrix with relatively well dispersed TiB2 particulate grains. The wear test results show that the wear rate of composites is gradually reduced over the sliding speed range for all normal loads. The composite wear rates are lower than the monolith ones. The Ti phase played a dual role in improving the tribological properties of the TiB2-Ti composites by acting as a lubricant and in increasing the fracture toughness by influencing the microstructure and mechanical properties. K e y w o r d s: TiB2-Ti composites, spark plasma sintering, coefficient of friction, wear

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“…Egashira et al used silicon probes which are originally used for scanning probe microscopes (SPM) as electrode for micro-EDM [11]. Takahata et al utilized LIGA process to fabricate high aspect ratio electrode arrays, hence batch mode micro-EDM could be achieved [12] [13]. The electrode fabricated by FIB-CVD was used for micro-EDM.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Micro Structures by Ultrashort Voltage Pulse Electrical Discharge Machining

Wang¹,

He²,

Xiao³

2018

JMMCE

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The machining of small holes and array holes has been a difficult problem in machining field. Tiny hole is widely used in mechanical field, for instance, fuel injection nozzles, spinneret holes for synthetic fibers and wire drawing dies. This paper investigated the application of EDM (electrical discharge machining) to the fabrication of micro structures. There are obvious limitations in the process of micro-electrical discharge machining, such as electrode wear, unstable discharge condition and low machining efficiency. The effects of EDM parameters were investigated, such as voltage, pulse frequency, and frequency of ultrasonic vibration applied to electrode. Micro holes were machined with Pt electrode made by focused-ion-beam chemical vapor deposition (FIB-CVD) and Cu electrode made by wire-electrode cutting. The comparison experiments between EDM and ECM (electrochemical machining) indicated that the processing of ECM has serious stray current corrosion and poor machining precision. Moreover, the workpiece vibration was firstly proposed to be utilized in the micro-electrical discharge machining. It can be concluded that maximum machine could be obtained under the amplitude ratio of 76%, which was an appropriate parameter.

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Effects of Wire EDM on the Microstructure of P/M Titanium Samples

Cited by 5 publications

References 24 publications

Influence of surface treatment and thermocycling on porcelain bonding to two forms of titanium

Influence of surface treatment and thermocycling on porcelain bonding to two forms of titanium

Mechanical and tribological properties of TiB2-Ti composites prepared by spark plasma sintering

Fabrication of Micro Structures by Ultrashort Voltage Pulse Electrical Discharge Machining

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