Uniformity Investigation of Barium Tungsten Cathode With Spherical Powder

Shang, Junbo; Yang, Xinyu; Wang, Ziyu; Shi, Jianfeng; Zhang, Jiuxing

doi:10.1109/led.2020.3048143

Cited by 10 publications

(1 citation statement)

References 23 publications

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“…most refractory of all metals in the periodic table [2]. In addition, tungsten cannot be infiltrated by liquid mercury and has a favorable corrosion resistance.…”

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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“…most refractory of all metals in the periodic table [2]. In addition, tungsten cannot be infiltrated by liquid mercury and has a favorable corrosion resistance.…”

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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Cathodes in magnetrons: A review

Liu,

Yang,

Sun

et al. 2024

MetalMat

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Magnetron is currently one kind of the most widely used vacuum electronic devices. The cathode, as the electronic source of the device, is the core of magnetrons. With the development of magnetrons, the requirements for cathode performance are also increasing, including thermal electron emission and secondary electron emission performance. This article reviews the development history of cathodes used in magnetrons, discusses the performance and application fields of various cathodes, and the relationship between performance and structure. However, there are still certain problems with various cathode materials that make it difficult to truly cover all magnetrons. The ongoing challenges relating to the magnetron cathodes have been discussed in this paper.

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