Manipulation and Characterization of a Novel Titanium Powder Precursor for Additive Manufacturing Applications

Sun, Yu; Gulizia, Stefan; Oh, C. H.; Doblin, Christian; Yang, Yugui; Qian, Ma

doi:10.1007/s11837-015-1301-3

Cited by 72 publications

(41 citation statements)

References 20 publications

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“…In addition, a decrease in the tap density/apparent density ratio (or Hausner ratio Hr) for recovered Ti powder probably occurs with increasing particle size d50 at a flow property: 1 < Hr < 1.25 [89]. This fair-to-excellent flow, with a 2540° angle of repose [90] that agrees with the angle of repose for Ti powders [91], may lead to a greater increase in Hall flow for irregular-shaped Ti particles [89] and a gradual decrease in the angle of repose due to a cohesive-to-free flow transition.…”

Section: Discussionsupporting

confidence: 58%

Molten Salt Electrometallurgy

Osarinmwian¹

2019

Preprint

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Molten salt is a wonder liquid with many superlatives to its name. It possesses low volatility, good heat transfer capacity, high electrical and thermal conductivity, radiation insensitivity, and low viscosity up to 1773 K. It is a universal electrolyte, chemical reaction medium, and energy storage medium while opening new opportunities for ecologically-safe, economically favourable methods for materials processing. Predominant Coulomb interaction between particles in molten salt makes it the best medium for physical and computer simulation of liquid structure and properties. Here we investigate molten salt electrometallurgy and related processes, and attempt to identify future mathematical modelling directions in which the field is likely to develop.

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Section: Discussionsupporting

confidence: 58%

Molten Salt Electrometallurgy

Osarinmwian¹

2019

Preprint

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“…54,55 The flowability of irregularly shaped powders was reportedly improved by removing sharp angles on the particles through high-speed blending or high sheer milling. Nonetheless, the particles produced by this method are only quasispherical shaped, which may limit its applications.…”

Section: Spheroidization By Mechanical Meansmentioning

confidence: 99%

Review of the Methods for Production of Spherical Ti and Ti Alloy Powder

Sun

Fang

Zhang

et al. 2017

JOM

186

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Spherical titanium alloy powder is an important raw material for near-netshape fabrication via a powder metallurgy (PM) manufacturing route, as well as feedstock for powder injection molding, and additive manufacturing (AM). Nevertheless, the cost of Ti powder including spherical Ti alloy has been a major hurdle that prevented PM Ti from being adopted for a wide range of applications. Especially with the increasing importance of powder-bed based AM technologies, the demand for spherical Ti powder has brought renewed attention on properties and cost, as well as on powder-producing processes. The performance of Ti components manufactured from powder has a strong dependence on the quality of powder, and it is therefore crucial to understand the properties and production methods of powder. This article aims to provide a cursory review of the basic techniques of commercial and emerging methods for making spherical Ti powder. The advantages as well as limitations of different methods are discussed.

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“…A recent study on recycled stainless steel powder has revealed many such changes. 5 In addition, noticeable distortions were found to occur to the perfectly spherical virgin Ti-6Al-4V powder particles after reuse for more than 30 times in AM by SEBM. 6 Hence, it is important to identify and understand how the virgin powder changes their characteristics with reuse times in the AM process from the perspectives of both cost control and quality manufacturing.…”

Section: Introductionmentioning

confidence: 96%

“…In fact, because of the high cost of the feedstock metal powders used for AM, especially for the AM of titanium (Ti) and Ti alloys, much effort has been made to develop cost-effective or more affordable metal powder materials suitable for AM. [2][3][4][5][6][7] The Arcam AM process (Arcam, Mölndal, Sweden), which has found applications in several sectors, [8][9][10] builds metal parts based on selective electron beam melting (SEBM) of metal powders layer by layer in a high-vacuum environment. Unlike other powderbed-based AM processes, the powder bed used in the Arcam process can be set up to 1100°C, which is necessary for the AM of some specialty materials such as TiAl-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting

Tang

Qian

Liu

et al. 2015

JOM

Self Cite

371

163

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An advantage of the powder-bed-based metal additive manufacturing (AM) processes is that the powder can be reused. The powder reuse or recycling times directly affect the affordability of the additively manufactured parts, especially for the AM of titanium parts. This study examines the influence of powder reuse times on the characteristics of Ti-6Al-4V powder, including powder composition, particle size distribution (PSD), apparent density, tap density, flowability, and particle morphology. In addition, tensile samples were manufactured and evaluated with respect to powder reuse times and sample locations in the powder bed. The following findings were made from reusing the same batch of powder 21 times for AM by selective electron beam melting: (i) the oxygen (O) content increased progressively with increasing reuse times but both the Al content and the V content remained generally stable (a small decrease only); (ii) the powder became less spherical with increasing reuse times and some particles showed noticeable distortion and rough surfaces after being reused 16 times; (iii) the PSD became narrower and few satellite particles were observed after 11 times of reuse; (iv) reused powder showed improved flowability; and (v) reused powder showed no measurable undesired influence on the AM process and the samples exhibited highly consistent tensile properties, irrespective of their locations in the powder bed. The implications of these findings were discussed.

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Manipulation and Characterization of a Novel Titanium Powder Precursor for Additive Manufacturing Applications

Cited by 72 publications

References 20 publications

Molten Salt Electrometallurgy

Molten Salt Electrometallurgy

Review of the Methods for Production of Spherical Ti and Ti Alloy Powder

Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting

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