REPRINT OF: High current liquid metal ion source using porous tungsten multiemitters

Vasiljevich, I.; Grienauer, W.

doi:10.1016/j.ultramic.2010.11.026

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…In addition, tungsten cannot be infiltrated by liquid mercury and has a favorable corrosion resistance. Therefore, tungsten materials are suitable alternatives to overcome the limitations of porous ceramics because of its brittleness for high temperature environments and other special requirements; thus, porous tungsten or porous tungsten matrix components has wide ranging applications in aerospace, power electronics, and metallurgical industries [3,4]. Porous tungsten has a high melting point, low vapor pressure, excellent electrical and thermal conductivities [5], as well as excellent corrosion resistance, and its internal porosity facilitates special applications.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional porous tungsten via DLP 3D printing from transparent ink

Zan¹,

Wang²,

Shi³

et al. 2022

J. Phys. D: Appl. Phys.

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Tungsten, an essential refractory metal material, has the characteristics of high melting and boiling points, high hardness, low expansion coefficient, and low vapor pressure. An indirect strategy to print three-dimensional (3D) refractory metal materials via digital light processing (DLP) followed by a post-treatment process was proposed. To analyze this strategy, a transparent ink with tungsten salts was developed, printed into a 3D precursor via DLP, and subsequently transited into 3D porous tungsten. The ultraviolet rheological properties and stability of the ink, transition process from the precursor to a 3D article, and the properties of the obtained 3D porous tungsten were investigated. This ink was preferable for DLP 3D printing, possessing consistency, stability and favorable absorbance at the wavelength of 385 nm. With increasing temperature, the weight of the tungsten salt in the 3D precursor decreased by 8.97% and was transited to tungsten oxide below 460 ℃, reduced to pure nano-sized tungsten at approximately 700 ℃, and finally sintered into porous articles. The organics initially contributed to polymerization during printing as well as reduction as a carbon reducer after pyrolysis. The pore size distribution of porous tungsten is nonlinear or multimodal, depending on the final sintering temperature. At 1200 ℃, two distinct peaks are observed in the pore distribution curves of the products. At 1400 ℃, the small pore as a whole decreases from approximately 100 to 1000 nm. Correspondingly, the relative density of the samples increased with temperature.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional porous tungsten via DLP 3D printing from transparent ink

Zan¹,

Wang²,

Shi³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Porous tungsten mainly is mainly prepared by PM [1][2][3][4] .In PM progress, it is difficult to control the porosity and the opening ratio of porous tungsten n [7] . Some special technology such as micro-powder injection molding [8] also produces porous tungsten, while the pore size in this progress is limited to several micron level.…”

Section: Introductionmentioning

confidence: 99%

Porous tungsten prepared by atmospheric-pressure chemical vapor deposition with WF6 and its characterization

Liu

Tan

et al. 2017

AIP Conference Proceedings

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Abstract. Porous tungsten (W) is used in aeronautic and aerospace engineering, power electronics field and metallurgical industry. In this study, porous W with 98wt% W was prepared on a carbon foam substrate by atmospheric-pressure chemical vapor deposition (CVD) with tungsten fluoride (WF6) as the precursor. The porous W with 78.1346% porosity displayed a pure α-W phase and the uniform surface. The mode pore diameter of porous W is 208.0 μm. In a compression test, the fracture strength of porous W is 20.3 MPa.

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