Sintering of Titanium Hydride Powder Compaction

Lee, Dongwon; Lee, Hak Sung; Park, Ji-Hwan; Shin, Shun Myung; Wang, Jei-Pil

doi:10.1016/j.promfg.2015.07.095

Cited by 35 publications

(17 citation statements)

References 6 publications

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“…Some studies describe sintering of TiH 2 powders resulting in high values of relative sintered density. As it is seen in Figure , 98% of relative density is achieved . Moreover, greater values than 99% were reported by Wang et al…”

Section: Challenges For Pm Titaniummentioning

confidence: 52%

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

et al. 2017

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Powder metallurgy (PM) is an attractive technology for manufacturing net-shape titanium-based components. However, it is challenging to make PM titanium products competitive in terms of mechanical properties. This article gives an overview of the current challenges in PM titanium and the best strategies to overcome them by alloying. By adding suitable alloying elements the properties of PM titanium components can be enhanced. The use of sintering aids helps to control the typical residual porosity of PM titanium alloys. Furthermore, controlling microstructure by alloying offers the possibility to go for high performance applications. Moreover, ductility is improved by adding elements that scavenge oxygen. A favorable selection of alloying elements offers a practical and competitive approach to meet the mechanical requirements in future PM titanium applications.

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Section: Challenges For Pm Titaniummentioning

confidence: 52%

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

et al. 2017

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“…This reflects in a final lower relative density after sintering as the three Ti-xAl-yCu alloys have fairly similar green density (Figure 6). Apart from the value of the sintered Ti-10Al-5Cu alloy, the relative density achieved in Ti-xAl-yCu alloys is comparable to that of other PM Ti materials [10,[24][25][26][27] as they are in the range between 92% and 95%. The alloys experience, then, different level of densification which varies between 17% for Ti-10Al-5Cu and 59% for Ti-2Al-1Cu due to the sintering stage.…”

Section: Discussionmentioning

confidence: 58%

Development of Cu-bearing powder metallurgy Ti alloys for biomedical applications

Bolzoni

Yang

2019

Journal of the Mechanical Behavior of Biomedical Materials

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Cu-bearing Ti alloys could be used as structural biomedical materials where the releasing of Cu ions is beneficial to lower infection incidences associated with surgical implants. The manufacturing of these alloys via powder metallurgy techniques can lower the production costs. In this study three ternary Cu-bearing Ti-xAl-yCu alloys were produced using conventional powder metallurgy. The mechanical properties increase with the amount of alloying elements. Samples of each composition were also forged to clarify the effect of subjecting them to hot deformation. Forging the samples improved the strength of the alloys due to the reduction of porosity and the refinement of the microstructural features. It is found that the Ti-2Al-1Cu is the most ductile, Ti-6Al-4Cu is the strongest and Ti-10Al-5Cu has a purely elastic behaviour. Some of these powder metallurgy Ti-xAl-yCu alloys have better overall mechanical behaviour than their cast counterparts and therefore are valuable alternative to produce medical and dental implants with improved properties and reduced cost.

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“…The oxygen concentration was measured to 0.41 wt.% a little smaller than the value before the dehydrogenation treatment. And such decreasing effect of oxygen content by dehydrogenation can be suggested by the additional reduction effect by de-gassed hydrogen atoms 18) and it is being more studied. It was accomplished in this study to find the optimal oxygen conditions on the magnesium gas reduction with pure Nb 2 O 5 powders under the atmospheric chamber pressure.…”

Section: Resultsmentioning

confidence: 99%

“…During the flushing process, it was found that some of the metallic Nb had changed into niobium hydride (NbH) through a reaction with hydrogen ions. Therefore, metallic Nb powder was finally obtained by performing a dehydrogenation heat treatment for the removal of the hydrogen component contained in the produced powder at 973 K and a vacuum pressure of 6 © 10 ¹6 kPa for 2 h. 18) The structure, phase, and components of the obtained metallic Nb powder were investigated using a scanning electron microscope (MIRA3 LM, TESCAN, Brno, Czech), an X-ray diffractometer (Rigaku, Tokyo, Japan), an oxygen/ nitrogen/hydrogen determinator (ELTRA ONH-P, Haan, Germany), a transmission electron microscope (JEOL 2100F, JEOL Ltd, Tokyo, Japan), and an elemental analyzer (Flash 2000, Thermo Fisher Scientific, U.K.).…”

Section: Methodsmentioning

confidence: 99%

Metallic Niobium Powder Reduced by Atmospheric Magnesium Gas with Niobium Pentoxide Powder

et al. 2021

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It was tried to find the optimal condition to prepare the metallic niobium powder with minimal oxygen content by atmospheric magnesiumgas reduction of niobium pentoxide (Nb 2 O 5 ) powder at 10731223 K, which are industrially moderate and low temperature ranges until maximally 80 h inside the chamber held under the argon circumstances of 110 kPa. Magnesium oxide of the by-product of the reduction, was dissolved and removed fully by dissolving in a 10% aqueous hydrochloric acid solution. The particle size of the niobium powder reduced for 20 h was slightly increased within the range of 200³600 nm according to increase of reduction temperatures. And such fine particles were further coarsened to near 1 µm by increase of reduction times until 80 h at 1173 K, which is thought to be the most suitable for magnesium-gas reduction to be applied in industry. The reduction time satisfied for a maximal reduction effect was found to be 60 hours as the oxygen content was then minimally saturated to about 0.42 wt.%. Furthermore, the hydrogen contamination due to acid leaching of 0.28 wt.% was fully removed by dehydrogenation, which was a heat treatment performed under vacuum at 827 K for 2 h; this resulted in the formation of metallic niobium powder.

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Sintering of Titanium Hydride Powder Compaction

Cited by 35 publications

References 6 publications

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

Development of Cu-bearing powder metallurgy Ti alloys for biomedical applications

Metallic Niobium Powder Reduced by Atmospheric Magnesium Gas with Niobium Pentoxide Powder

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