Fabrication of homogeneous tungsten porous matrix using spherical tungsten powders prepared by thermal plasma spheroidization process

Li, Baoqiang; Sun, Zhiqiang; Jin, Huacheng; Hu, Peng; Yuan, Fangli

doi:10.1016/j.ijrmhm.2016.06.002

Cited by 28 publications

(5 citation statements)

References 28 publications

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“…Li Baoqiang et al [ 22 ] used plasma spheroidization to prepare irregular tungsten powder into dense spherical tungsten particles, which have uniform pores and a high degree of densification, which is conducive to the manufacturing of tungsten-based composites with a tight structure. The thermal conductivity of the W–Cu composites prepared by it is about 10% higher than that of the W–Cu composites prepared from irregular tungsten powder, and the relative density also reaches 99.5%, indicating that spherical powder particles have certain advantages in the manufacturing of W–Cu composites.…”

Section: Powder Manufacturing Technologiesmentioning

confidence: 99%

“…The aerosol blue tungsten particle size of 35-42 µm, the reduction temperature of 800, 840, 900, 960 °C, hydrogen flow rate of 20 m 3 /h, the loading boat volume of 800 g conditions to obtain the tungsten powder of Fsss particle size of 2.0-2.2 µm without agglomeration, as shown in Figure 3. Li Baoqiang et al [22] used plasma spheroidization to prepare irregular tungsten powder into dense spherical tungsten particles, which have uniform pores and a high degree of densification, which is conducive to the manufacturing of tungsten-based compo- Li Baoqiang et al [22] used plasma spheroidization to prepare irregular tungsten powder into dense spherical tungsten particles, which have uniform pores and a high degree of densification, which is conducive to the manufacturing of tungsten-based composites with a tight structure. The thermal conductivity of the W-Cu composites prepared by it is about 10% higher than that of the W-Cu composites prepared from irregular tungsten powder, and the relative density also reaches 99.5%, indicating that spherical powder particles have certain advantages in the manufacturing of W-Cu composites.…”

Section: Powder Manufacturing Technologiesmentioning

confidence: 99%

See 1 more Smart Citation

Research Status of Manufacturing Technology of Tungsten Alloy Wire

Cao

Sun

et al. 2023

Micromachines

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In light of the fact that tungsten wire is gradually replacing high-carbon steel wire as a diamond cutting line, it is particularly important to study tungsten alloy wire with better strength and performance. According to this paper, in addition to various technological factors (powder preparation, press forming, sintering, rolling, rotary forging, annealing, wire drawing, etc.), the main factors affecting the properties of the tungsten alloy wire are the composition of the tungsten alloy, the shape and size of the powder, etc. Combined with the research results in recent years, this paper summarizes the effects of changing the composition of tungsten materials and improving the processing technology on the microstructure and mechanical properties of tungsten and its alloys and points out the development direction and trend of tungsten and its alloy wires in the future.

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Section: Powder Manufacturing Technologiesmentioning

confidence: 99%

Section: Powder Manufacturing Technologiesmentioning

confidence: 99%

Research Status of Manufacturing Technology of Tungsten Alloy Wire

Cao

Sun

et al. 2023

Micromachines

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“…As a crucial component of the cathode, the porous tungsten matrix acts as a carrier for the emissive material and activator. While increased porosity can enhance the electron emission performance of the cathode, excessive porosity can accelerate cathode evaporation and diminish its service life [5][6][7][8][9]. Consequently, researchers have long endeavored to enhance the performance and service life of porous tungsten matrices.…”

Section: Introductionmentioning

confidence: 99%

The Integrated Preparation of Porous Tungsten Gradient Materials with a Wide Porosity Range

Zhu,

Jia,

Huang

et al. 2024

Metals

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Porous tungsten gradient materials with ordered gradient variations in pore size have significant application value in the field of vacuum electronic devices. This work combines tape casting and dealloying methods to achieve the integrated preparation of porous tungsten gradient materials with a wide range of controllable porosity. The study focused on the phase composition and microstructure evolution during the preparation of porous tungsten gradient materials. The results show that the tape casting process allows for the precise and controllable thickness of each layer of the porous tungsten materials and uniform composition structure, while the stepwise dealloying of Fe and Ti enables a wide range of controllable porosity for the porous tungsten gradient materials. PVB, after thermal decomposition, provides a carbon source for the in situ reaction to form W-Fe-C compounds, and the surface diffusion behavior of W-Fe-C compounds at high temperatures improves the stratification of the porous tungsten gradient materials. This work provides a design concept for the integrated preparation of porous metal gradient materials.

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“…Owing to excellent characteristics such as high hardness, hot strength, wear resistance, and high melting point, the porous tungsten matrix are nowadays extensively employed in mechanical, electrical engineering and high temperature applications [1].Typically, partially sintered(less 80% of theoretical density) tungsten is further served as the matrix impregnated with metals (such as Cu/Ag) and alkaline earth oxides applied in electrical contact field and high current density cathode [2][3][4][5]. In these applications, porous tungsten matrix with homogeneous pore distribution and high open porosity are important factors to obtain uniform infiltrates distribution, which has a significant influence on the performance of targeted materials [6]. For instance, W-Cu alloys are normally produced by liquid copper infiltration technique.…”

Section: Introductionmentioning

confidence: 99%

Tungsten Matrix Material for Diffusion Barium Tungsten Cathode

Zhou

Deng

et al. 2018

MSF

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As the core component of the diffusion cathode, the performance of porous tungsten matrix material will directly affect the output performance and life of microwave source. Therefore, the preparation of porous tungsten matrix is the key process of making a cathode material. In this paper, the industrial tungsten powder was used as raw material, whose particle size was modulated by fluidic classification firstly. Then via cold isostatic pressing and hydrogen sintering in high temperature, the porous tungsten sintered body was obtained. Finally, by the process of copper infiltration, machining and copper removal, the porous tungsten matrix was achieved. The result showed that compared with raw material tungsten powder, the classified tungsten powder’s particle size distribution was narrowed and its tap density obviously increased, indicating that it had better particle stacking performance. Setting the temperature between 1900°C and 2050°C the high temperature hydrogen sintering experiment was conducted, and it was found that the volume shrinkage ratio of tungsten sintered body increased with the sintering temperature, and correspondingly, its total porosity decreased from 24.4% at 1900°C to 20.8% at 2050°C. It was characterized by MIP (mercury intrusion porosimetry) that at high temperature between 1950~2050°C, the porous tungsten matrix with an open porosity of 21±1%, 1.30~1.60μm average pore size, a close cell ratio less than 1% and the skeleton strength greater than 150MPa was obtained. Thus this porous tungsten matrix is an ideal material to be applied to highly reliable diffusion bariated tungsten cathode manufacturing.

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Fabrication of homogeneous tungsten porous matrix using spherical tungsten powders prepared by thermal plasma spheroidization process

Cited by 28 publications

References 28 publications

Research Status of Manufacturing Technology of Tungsten Alloy Wire

Research Status of Manufacturing Technology of Tungsten Alloy Wire

The Integrated Preparation of Porous Tungsten Gradient Materials with a Wide Porosity Range

Tungsten Matrix Material for Diffusion Barium Tungsten Cathode

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