Microstructure and properties of silver-added W-Cu prepared by infiltration sintering

Liu, Dong–Guang; Meng, Lin; ZOU, Jin-xin; Luo, Lei; Wu, Yucheng

doi:10.1016/j.ijrmhm.2022.105947

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…Owing to the fluidity of Ag, the liquid Ag coalesced into a continuous structure, and the small amount of Ag in W functioned as a conductive agent, facilitating conduction. The addition of Ag during the pre-sintering process significantly enhanced the flowability of the infiltrating Ag, promoting densification [14]. The skeleton formed between W particles creates a network of capillaries.…”

Section: Liquid-phase Flow Infiltrationmentioning

confidence: 99%

“…AgW materials' 'self-spontaneous sweating cooling' mechanism allows their utilisation at temperatures exceeding 3000 • C, making them useful in fields such as aerospace, electronic engineering, and metallurgy. The preparation methods include the mixed-pressing sintering method [8], the infiltration method [9][10][11][12][13][14], the activated liquidphase sintering method [15,16], mechanical alloying [17][18][19], the chemical co-precipitationhydrogen reduction method [20,21], and the sol-gel method [22,23]. The infiltration method is one of the primary techniques used for producing AgW composite materials.…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature Sintering and Infiltration of High-W Contacts

Zhao,

Xie,

2023

Applied Sciences

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AgW materials exhibit excellent properties and are widely used as contact materials in low- and medium-voltage switches. In this study, a pre-sintering and infiltration method was employed to pre-sinter W powder with Cu, Ni, and (Cu+Ni) additions in the low temperature range of 950–1050 °C. The low-temperature sintering behaviours of W skeletons with different additives were investigated. Subsequently, AgW (70 wt%), AgW (75 wt%), AgW (80 wt%), and AgW (85 wt%) materials were prepared through infiltration at 1050 °C. The microstructure morphology and physical properties of high-W contact materials were investigated using a metallographic microscope and scanning electron microscope. The mechanism of low-temperature sintering–infiltration of high-W contact materials was elucidated. The results indicate that pure W and 1% Cu-added W skeletons experience minimal linear shrinkage within the temperature range of 950–1050 °C. The linear shrinkage curves of W skeletons with different additives coincided under the conditions of 950–1000 °C/90 min. At 1050 °C, after sintering for 150 min, the particle boundaries in the W skeleton were fully spheroidised, with a dihedral angle of 120°. At 1050 °C and after 150 min of infiltration, cross-sectional micrographs of the AgW material revealed the presence of irregular Ni layers, where Ni spatially enveloped/encapsulated Ag. With an increase in the W content, the electrical conductivity and relative density of AgW (70–85) materials decreased, whereas the hardness of the materials increased.

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Section: Liquid-phase Flow Infiltrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Temperature Sintering and Infiltration of High-W Contacts

Zhao,

Xie,

2023

Applied Sciences

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“…In general, the joining of dissimilar materials can be achieved through the common methods of traditional brazing, diffusion welding, and hot isostatic pressing [11][12][13]. Nevertheless, these techniques have different disadvantages and limitations.…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructure, Mechanical Performance and Thermal Shock Resistance of Diffusion Welded Joint of ODS-W and TZC Alloy

Liu,

Zhou,

et al. 2023

Metals

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The diffusion welded joint of oxide dispersion strengthened tungsten (ODS-W) and Mo-Ti-Zr-C alloy (TZC) was successfully fabricated with the use of spark plasma sintering (SPS) at a vacuum level of 10 Pa. This study systematically investigates the microstructure, mechanical performance, and thermal shock resistance of the ODS-W/TZC connector at four different temperatures, ranging from 1300 to 1600 °C. The diffusion distance between the W and Mo atoms at the interface of ODS-W/TZC joint raises as the sintering temperature increases, with a maximum diffusion distance of up to 2 μm at 1500 °C, but then slightly decreases at 1600 °C. The ODS-W/TZC connector bonded at 1500 °C exhibits the best tensile performance, with tensile strengths of 459 MPa and 786 MPa at room temperature and 500 °C, respectively. A maximum hardness of 446 HV is obtained at the interface when the sample is sintered at 1600 °C. Thermal shock tests are conducted on the surface and interface of the ODS-W/TZC connector sintered at various temperatures. ODS-W/TZC samples prepared below 1500 °C were severely damaged, leading to exfoliation after laser thermal shock, while samples prepared above 1500 °C produced fewer damage cracks. Confocal laser scanning microscope (CLSM) analysis demonstrated that the ODS-W/TZC joint fabricated at 1500 °C exhibited substantially reduced height perturbation of both its surface and interface compared to that of ODS-W, providing evidence for its superior thermal shock resistance.

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