Preparation of Spherical Titanium Powders from Polygonal Titanium Hydride Powders by Radio Frequency Plasma Treatment

Yang, Sangsun; Gwak, Ji-Na; Lim, Tae-Soo; Yun, Jung‐Yeul

doi:10.2320/matertrans.m2013329

Cited by 26 publications

(12 citation statements)

References 24 publications

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“…Titanium hydride in the form of spherical granules is increasingly being used in practice [8][9][10]. The use of spherical titanium hydride eliminates the disadvantages of using polydisperse powder.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Adherence of Metallic Copper to the Surface of Titanium Hydride

et al. 2021

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Studies have been carried out to increase the adhesive interaction between a titanium hydride substrate and a copper coating. An additional layer containing chemically active groups was created on the surface of the spherical titanium hydride by chemisorption modification. This paper discusses the results of scanning electron microscopy (SEM) using energy-dispersive X-ray spectroscopic mapping of coatings obtained on spherical granules of titanium hydride before and after adsorption modification. The mechanism of interaction of the surface of spherical granules of titanium hydride and titanium sulfate salt is proposed. It is shown that the creation of a chemisorbed layer of hydroxotitanyl and the subsequent electrodeposition of metallic copper contribute to the formation of a multilayer shell of a titanium–copper coating on the surface of spherical titanium hydride granules (≡Ti-O-Cu-) with a high adhesive interaction. Results have been given for an experimental study of the thermal stability of the initial spherical granules of titanium hydride and granules coated with a multilayer titanium-copper shell.

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Section: Introductionmentioning

confidence: 99%

Increasing the Adherence of Metallic Copper to the Surface of Titanium Hydride

et al. 2021

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“…Titanium and its alloys have low density, high specific strength, good ductility and fracture toughness, high corrosion resistance and good biological compatibility, and thus are widely used in the fields of aerospace, chemical engineering and biomedical equipment manufacturing [1][2][3]. However, their applications are highly limited by their high costs.…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation and spheroidization of titanium hydride powder based on fluidization principle

Yan

Zhang

Liu

et al. 2020

Heat Treatment and Surface Engineering

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Dehydrogenation of TiH 2 powder is an important method for preparing low-cost titanium powder. In this study, a novel dehydrogenation process of titanium hydride powder was developed based on the fluidization principle. TiH 2 powder with particle sizes of <75 μm was placed evenly on the fluidization bed in a specially designed reactor and dehydrogenated at 560°C for 120 min with argon gas flowing from the bottom to top of the reactor. The resulting powder was analyzed using X-ray diffractometry, scanning electron microscopy, Hall flowmeter and laser scattering particle size analyzer. It was evident that a Ti powder with a small amount of TiH 1.5 was obtained after the dehydrogenation process at a relatively low temperature. The edges and corners of the particles became rounded due to the thermodynamic driving force originated from the reduction of particle surface areas. The fluidity of powder was also improved due to the increase of sphericity of the powder particles during dehydrogenation. After dehydrogenation, the particle size range became smaller, and the average particle size increased, showing that slight sintering of the very fine titanium particles occurs.

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“…In comparison with thermal plasma that has an extremely high temperature (~ 10,000 K) and has been applied in synthesizing high-purity metals, especially for refractory metals and high-temperature resistant metals [20][21][22][23] , there are a few studies using low-temperature atmospheric-pressure plasma to synthesize metals. For example, the low-temperature plasma, that only electrons have high temperature, could synthesize granular shapes of metallic Cu nanoparticles from a Cu wire at a gas temperature of 1500 K 24,25 .…”

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confidence: 99%

Formation of spherical Sn particles by reducing SnO2 film in floating wire-assisted H2/Ar plasma at atmospheric pressure

Nguyen

Sasaki

Tsutsumi

et al. 2020

Sci Rep

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A green method to synthesize spherical Sn particles by reducing SnO2 film in atmospheric-pressure H2/Ar plasma at low temperatures for various applications is presented. The floating wire-assisted remotely-generated plasma with a mixture of 0.05% H2/Ar gas formed spherical metallic Sn particles by reducing a SnO2 layer on glass substrate. During the reduction process, H radical density was measured by using vacuum ultraviolet absorption spectroscopy, and plasma properties including electron density and gas temperature were diagnosed by optical emission spectroscopy. The inductively coupled generated plasma with a high electron density of 1014 cm−3, a hydrogen atom density of 1014 cm−3, and a gas temperature of 940 K was obtained at a remote region distance of 150 mm where the SnO2/glass substrate was placed for plasma treatment. The process has been modeled on the spherical Sn formation based on the reduction of SnO2 films using H radicals. Depending on the treatment condition, the total reduction area, where spherical Sn particles formed, was enlarged and could reach 300 mm2 after 2 min. The substrate temperature affected the expansion rate of the total reduction area and the growth of the Sn spheres.

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Preparation of Spherical Titanium Powders from Polygonal Titanium Hydride Powders by Radio Frequency Plasma Treatment

Cited by 26 publications

References 24 publications

Increasing the Adherence of Metallic Copper to the Surface of Titanium Hydride

Increasing the Adherence of Metallic Copper to the Surface of Titanium Hydride

Dehydrogenation and spheroidization of titanium hydride powder based on fluidization principle

Formation of spherical Sn particles by reducing SnO2 film in floating wire-assisted H2/Ar plasma at atmospheric pressure

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