Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

Wang, Di; Yang, Wei; Wei, Xiongmian; Khanlari, Khashayar; Wang, Zhi; Feng, Yi; Yang, Xinwei

doi:10.3390/cryst12040480

Cited by 5 publications

(6 citation statements)

References 36 publications

(61 reference statements)

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“… ( a ) Vickers hardness depend on laser power and scanning speed, ( b ) Vickers hardness depends on relative density; ( c ) Hardness and thermal conductivity of silver alloys in this and previous studies, *: Xiong et al and Vikram et al did not conduct research on thermal conductivity; Wang et al did not conduct research on Vickers hardness [ 20 , 21 , 25 , 44 , 52 , 53 ]. …”

Section: Figurementioning

confidence: 78%

“…In recent years, studies on the additive manufacturing of silver and silver alloys have mainly focused on the LPBF forming process [ 20 , 21 , 22 ], microstructure, performance [ 23 , 24 , 25 , 26 ] and microscopic defects [ 27 ], but few studies have been carried out on powder’s preparation. Gas atomisation (GA), the plasma rotating electrode process (PREP) and plasma atomisation (PA) are the three main methods for the preparation of LPBF metal powders [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

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High-Quality Spherical Silver Alloy Powder for Laser Powder Bed Fusion Using Plasma Rotating Electrode Process

Li,

Zhang,

Chen

et al. 2024

Micromachines

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The plasma rotating electrode process (PREP) is an ideal method for the preparation of metal powders such as nickel-based, titanium-based, and iron-based alloys due to its low material loss and good degree of sphericity. However, the preparation of silver alloy powder by PREP remains challenging. The low hardness of the mould casting silver alloy leads to the bending of the electrode rod when subjected to high-speed rotation during PREP. The mould casting silver electrode rod can only be used in low-speed rotation, which has a negative effect on particle refinement. This study employed continuous casting (CC) to improve the surface hardness of S800 Ag (30.30% higher than mould casting), which enables a high rotation speed of up to 37,000 revolutions per minute, and silver alloy powder with an average sphericity of 0.98 (5.56% higher than gas atomisation) and a sphericity ratio of 97.67% (36.28% higher than gas atomisation) has been successfully prepared. The dense S800 Ag was successfully fabricated by laser powder bed fusion (LPBF), which proved the feasibility of preparing high-quality powder by the “CC + PREP” method. The samples fabricated by LPBF have a Vickers hardness of up to 271.20 HV (3.66 times that of mould casting), leading to a notable enhancement in the strength of S800 Ag. In comparison to GA, the S800 Ag powder prepared by “CC + PREP” exhibits greater sphericity, a higher sphericity ratio and less satellite powder, which lays the foundation for dense LPBF S800 Ag fabrication.

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Section: Figurementioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

High-Quality Spherical Silver Alloy Powder for Laser Powder Bed Fusion Using Plasma Rotating Electrode Process

Li,

Zhang,

Chen

et al. 2024

Micromachines

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“…It is difficult to find publications in the scientific literature discussing the impact of Cr and Ni additions on the structure and properties of laser-melted silver. Publications most often discuss the impact of laser melting on the structure and properties of pure silver and 925 silver [1,30,31] and investigations concerning silver alloys with the addition of Cu, C, and W [32], or the alloy Ag-Cu [2,33]. Investigations concerning the alloy Ag-Cu-Ge have also been published [34].…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, they present strong disadvantages in their relatively low wear resistance and hardness, which can be a problem for long-term usage, such as in switch elements. The combination of laser surface treatment and addition of different types of metallic powders in the surface layer has been identified as a possible solution for this [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Silver Alloy Surface Modification for Mechanical Property Enhancement in Aviation and Transportation

Labisz,

Konieczny

2024

Applied Sciences

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Silver alloys are often used for electrical switches in railway transportation. However, a well-known issue with these switches is their relatively short application period due to certain disadvantages of silver alloys, mainly their low hardness and low resistance to abrasive wear, in contrast to their excellent electrical conductivity. Therefore, the main goal of this study was to increase or maintain the hardness of the surface layer in order to extend the life of worn parts without compromising their electrical properties. Instead of ceramic particles, as in other studies, metallic powders were used, which could increase the electrical and/or thermal properties of silver alloys. The following work presents the use of laser processing as a relatively new technique for metal and metal alloy surface processing technology. In particular, a process based on the melting of silver (Ag) with metallic powders, such as chromium (Cr) and nickel (Ni) particles, is presented. The aim was for these powders to create intermetallic phases with a silver matrix in the obtained surface layer, significantly improving the mechanical properties based on the formation of the phases coherent or semi-coherent with the silver matrix. Regarding the original practical implications of this work, it was important to investigate the possibility of applying fibre laser for surface property enhancement. The scientific aim was to describe the changes in microstructure and compounds that occurred in the laser-remelted surface silver layer after Ni and Cr particles were fed into the basic silver material. It was concluded that the surface layer obtained after chromium application was without cracks and defects and had a higher hardness than the untreated material. A three-zone structure was also found in the obtained surface layer: (1) the remelted zone, (2) the heat-affected zone, and (3) the matrix material. The remelting zone revealed a higher hardness compared to the untreated material, reaching 92 HV0.3, which is more than twice the initial hardness value.

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“…[18] As shown in Figure 1a, the bulk Mo metal delivers the highest yield strength (≈500 MPa) among the metallic elements that have been employed in SSE interfacial modification (i.e., Al: 46 MPa; Mg: 35 MPa, Zn: 85 MPa; Cu: 50 MPa; Ni: 63 MPa; Ag: 57 MPa; Sn: 38 MPa). [19][20][21][22][23][24][25][26] Furthermore, the yield strength of nanocrystalline Mo reaches up to the GPa level owing to the size effect, [25] which is a thousandfold higher than that of bulk Li metal (≈0.8 MPa only), endowing the suppression of Li dendrite growth. More importantly, these Mo nanocrystals remains in the MIS layer during cycling rather than gradually diffusing into Li metal anode.…”

Section: The Rational Design and Properties Of Mis Layermentioning

confidence: 99%

A Lithium Intrusion‐Blocking Interfacial Shield for Wide‐Pressure‐Range Solid‐State Lithium Metal Batteries

Hu,

Yu,

Wang

et al. 2023

Advanced Materials

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Lithium garnets are considered as promising solid–state electrolytes for next–generation solid–state Li metal batteries (SSLBs). However, the Li intrusion driven by external stack pressure triggers premature of Li metal batteries. Herein, for the first time, we report an in situ constructed interfacial shield to efficiently inhibit the pressure–induced Li intrusion in SSLBs. Theoretical modeling and experimental investigations reveal that high–hardness metallic Mo nanocrystals inside the shield effectively suppress Li dendrite growth without alloy hardening–derived interfacial contact deterioration. Meanwhile the electrically insulated Li2S as a shield component considerably promotes interfacial wettability and hinders Li dendrite penetration into the bulk of garnet electrolyte. Interfacial shield–protected Li6.4La3Zr1.4Ta0.6O12 (LLZTO)–based cells exhibit significantly enhanced cyclability without short circuits under conventional pressures of ≈0.2 MPa and even at high pressure of up to 70 MPa; which is the highest endurable stack pressure reported for SSLBs using garnet electrolytes. These key findings are expected to promote the wide–pressure–range applications of SSLBs.This article is protected by copyright. All rights reserved

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Selective Laser Melting of Pure Ag and 925Ag Alloy and Their Thermal Conductivity

Cited by 5 publications

References 36 publications

High-Quality Spherical Silver Alloy Powder for Laser Powder Bed Fusion Using Plasma Rotating Electrode Process

High-Quality Spherical Silver Alloy Powder for Laser Powder Bed Fusion Using Plasma Rotating Electrode Process

Silver Alloy Surface Modification for Mechanical Property Enhancement in Aviation and Transportation

A Lithium Intrusion‐Blocking Interfacial Shield for Wide‐Pressure‐Range Solid‐State Lithium Metal Batteries

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