Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Lee, W.H.; Hyun, Chang-Yong

doi:10.1016/j.apsusc.2006.10.021

Cited by 5 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yield strengths in the range of 18.5-435.6 MPa were measured for atomized powders (100-150 μm) subjected to discharges in argon of 1.07-2.86 kJ/g [114], therefore resulting in much higher values than the resistance of human teeth and conventionally sintered Ti dental implants [110]. A similar surface modification to that observed in pure Ti is observed in Ti-Al-V alloys, with the formation of TiO2, Ti2O3, TiN and TiC after sintering in air with 1.5 kJ [61], or just TiO2 and TiN for 1.43 kJ/g [113]. The use of vacuum atmosphere and 1.43 kJ/g only produced a light presence of TiO2 [111].…”

Section: Titanium-basementioning

confidence: 79%

“…Regarding Ti-base materials, EDC processing of pure Ti was studied in India [26], Italy [44], and specifically for medical implants, in Korea [37,41,48,55,109] and Belarus [42]. This later research group has also studied the Ti-6Al-4V alloy, initially in the US [39,72,107] and more extensively in Korea [38,45,61,[110][111][112][113][114]. In addition, MA Ti-Si 37.5 powders [115,116], mixed Ti-Si 37.5 powders [40], Ti-Al 25 [46,47], Ti-28Zr-20Ni [117], or mixtures Ti-TiC [73] have also been studied in Korea.…”

Section: Studied Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Aranda

Fernández

Lozano-Pérez

et al. 2021

Metals

View full text Add to dashboard Cite

Manufacturing metallic materials from elemental or alloyed powders is an option in many industrial processes. Nevertheless, the traditional powder metallurgy processing including furnace sintering is at times detrimental for the microstructure attained in the powders. Alternative sintering processes based on the use of electricity and the energy obtained by the Joule effect in powder particles can be quick enough to avoid microstructural changes. In particular, when the energy is stored in a capacitor and then discharged, the heating process is extremely quick, lasting milliseconds or even microseconds. This process, generally known as electrical discharge consolidation, has been applied to a wide variety of metallic materials, easily preserving the original microstructure of the powders. Both porous or homogeneous and highly densified material can be obtained, and without losing the desired properties of the consolidated material. A general overview of the process and applications, as well as the results obtained by different research groups around the world, have been reviewed in this manuscript.

show abstract

Section: Titanium-basementioning

confidence: 79%

Section: Studied Materialsmentioning

confidence: 99%

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Aranda

Fernández

Lozano-Pérez

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…The method proposed in this paper can be considered, to some extent, as a development of the pulsed electric current sintering (PECS) method. [23][24][25][26][27][28] In the conventional PECS method, the entire volume of powder is poured into a dielectric matrix, compressed by electrodes, and a powerful electric current pulse is passed through it. This method allows for obtaining bulk material with a different degree of porosity 29,30 from virtually any electrically conductive powder.…”

Section: Introductionmentioning

confidence: 99%

Consolidation of Cu- and Ti-based metal powders using layer-by-layer, spot pulsed electric current sintering

IA¹,

VA²,

KS³

et al. 2020

MSEIJ

View full text Add to dashboard Cite

In this paper, we propose a technique for additive manufacturing of bulk materials from electrically conductive powders, based on the method of point wise electro pulse sintering. This method consists of layer-by-layer consolidation of powders, each layer being formed as a result of successive sintering of small portions of powder compressed between the electrode and the substrate, or between the electrode and the previously sintered layer. Using the proposed method, bulk samples were obtained from powders having the different chemical composition (Cu, Ti, mechanically alloyed tin bronze), and particles of various shapes (dendritic, dumbbell, stone-shaped). Using X-ray diffraction, electron microscopy, and micro hardness measurements, the structural phase states, and porosity of the obtained bulk consolidated materials were studied. Sintering of powders using this method is greatly influenced by the heat release along the boundaries of the particles, which in turn depends on the electrical resistivity of the material. The porosity of the sintered samples mainly depends on the type of powder used and decreases with the decreasing size of the powder particles. Keywords: additive manufacturing, electro pulse sintering, metal powders, porous structure

show abstract

“…For the preparation of porous materials, electric current can be applied in different modes. High-voltage consolidation for the production of porous metals has been presented in a number of publications [8,9,10,11,12,13,14,15]. In a recent article, Minko and Belyavin reviewed the studies of the structure and properties of porous titanium, niobium, and tantalum obtained by high-voltage consolidation [9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Porous Materials by Spark Plasma Sintering: A Review

2019

View full text Add to dashboard Cite

Spark plasma sintering (SPS), a sintering method that uses the action of pulsed direct current and pressure, has received a lot of attention due to its capability of exerting control over the microstructure of the sintered material and flexibility in terms of the heating rate and heating mode. Historically, SPS was developed in search of ways to preserve a fine-grained structure of the sintered material while eliminating porosity and reaching a high relative density. These goals have, therefore, been pursued in the majority of studies on the behavior of materials during SPS. Recently, the potential of SPS for the fabrication of porous materials has been recognized. This article is the first review to focus on the achievements in this area. The major approaches to the formation of porous materials by SPS are described: partial densification of powders (under low pressures, in pressureless sintering processes or at low temperatures), sintering of hollow particles/spheres, sintering of porous particles, and sintering with removable space holders or pore formers. In the case of conductive materials processed by SPS using the first approach, the formation of inter-particle contacts may be associated with local melting and non-conventional mechanisms of mass transfer. Studies of the morphology and microstructure of the inter-particle contacts as well as modeling of the processes occurring at the inter-particle contacts help gain insights into the physics of the initial stage of SPS. For pre-consolidated specimens, an SPS device can be used as a furnace to heat the materials at a high rate, which can also be beneficial for controlling the formation of porous structures. In sintering with space holders, SPS processing allows controlling the structure of the pore walls. In this article, using the literature data and our own research results, we have discussed the formation and structure of porous metals, intermetallics, ceramics, and carbon materials obtained by SPS.

show abstract

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Cited by 5 publications

References 15 publications

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

Consolidation of Cu- and Ti-based metal powders using layer-by-layer, spot pulsed electric current sintering

Fabrication of Porous Materials by Spark Plasma Sintering: A Review

Contact Info

Product

Resources

About