Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering

Fernández, Fátima Ángela Ternero; Caballero, Eduardo Sánchez; Astacio, Raquel; Cintas, J.; Montes, J. M.

doi:10.3390/ma13092131

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…At 0.5 and 1.0 Wt.% ZnO NP content, agglomeration of many ZnO NPs at grain boundaries produced a type of grain boundary phase that increased charge carrier scattering, resulting in increases in electrical resistivity of 2.979 and 2.802 × 10 −7 Ω · m, respectively. Furthermore, a high porosity value affects electrical resistivity (Ternero et al , 2020; Nai et al , 2008). Material densification, interface condition and particle contribution can all play a role in the electrical resistivity changes of (SAC355) 100- x (ZnO) x solder alloys (Tekce et al , 2016).…”

Section: Resultsmentioning

confidence: 99%

ZnO nanoparticles and compositional dependence of structural, thermal, mechanical and electrical properties of eutectic SAC355 lead-free solder

Al-sorory

Gumaan

Shalaby

2022

SSMT

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Purpose This paper aims to summarise the effects of ZnO nanoparticles (0.1, 0.3, 0.5, 0.7 and 1.0 Wt.%) on the structure, mechanical, electrical and thermal stability of Sn–3.5Ag–0.5Cu (SAC355) solder alloys for high-performance applications. Design/methodology/approach The phase identification and morphology of the solders were studied using X-ray diffraction and scanning electron microscopy. Thermal parameters were investigated using differential scanning calorimetry. The elastic parameters such as Young's modulus (E) and internal friction (Q−1) were investigated using the dynamic resonance technique, whereas the Vickers hardness (Hv) and creep indentation (n) were examined using a Vickers microhardness tester. Findings Microstructural analysis revealed that ZnO nanoparticles (NPs) were distributed uniformly throughout the Sn matrix. Furthermore, addition of 0.1, 0.3 and 0.7 Wt.% of ZnO NPs to the eutectic (SAC355) prevented crystallite size reduction, which increased the strength of the solder alloy. Mechanical parameters such as Young's modulus improved significantly at 0.1, 0.3 and 0.7 Wt.% ZnO NP contents compared to the ZnO-free alloy. This variation can be understood by considering the plastic deformation. The Vickers hardness value (Hv) increased to its maximum as the ZnO NP content increased to 0.5. A stress exponent value (n) of approximately two in most composite solder alloys suggested that grain boundary sliding was the dominant mechanism in this system. The electrical resistance (ρ) increased its maximum value at 0.5 Wt.% ZnO NPs content. The addition of ZnO NPs to plain (SAC355) solder alloys increased the melting temperature (Tm) by a few degrees. Originality/value Development of eutectic (SAC355) lead-free solder doped with ZnO NPs use for electronic packaging.

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Section: Resultsmentioning

confidence: 99%

ZnO nanoparticles and compositional dependence of structural, thermal, mechanical and electrical properties of eutectic SAC355 lead-free solder

Al-sorory

Gumaan

Shalaby

2022

SSMT

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“…Different methods such as powder metallurgy (PM), casting, infiltration casting and electrodeposition can be used in the production of porous Ni. Among these, the PM method is advantageous compared to others in terms of being suitable for open-cell foam production, allowing precise dimensional tolerances and high purity production [11][12][13][14]. In addition, it is possible to good control the volume fraction, geometry and size of the pores by the PM method.…”

Section: Introductionmentioning

confidence: 99%

The production of open cell Ni-foam using KBr as spacer and oxidation shield via powder metallurgy technique

Gök

2021

International Advanced Researches and Engineering Journal

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Metallic materials having a porosity of 70% or more are generally referred as highly porous metals. In this study, highly porous pure nickel materials were produced by powder metallurgy route. In the production process, potassium bromide was used both as a space-holder phase and as an oxidation shield. In the method, firstly, nickel and potassium bromide powders were mixed according to the desired void ratio. The obtained nickel-potassium bromide powders were pressed in a hydraulic press and turned into pellets (diameter: 13mm). Then, these pellets were pressed again in a wider mold (diameter: 21mm) so that all surfaces were covered with potassium bromide, and the encapsulation process was carried out. These capsules were embedded in potassium bromide in an alumina crucible for sintering. The sintering process was carried out in an open atmosphere at 1050 °C for 60 minutes. After the sintering process, the crucibles were kept in water to dissolve the crystallized potassium bromide around and inside the sample. Density, macrostructure, microstructure and EDS analyzes were performed on the samples. It was observed that open cell pores (58.3 -78.1% vol) with diameters varying between 5 and 500 µm, which are homogeneously distributed in nickel, have been successfully obtained. In addition, it was proved that nickel foam materials can be produced in different sizes and designs.

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Effect of temperature on electrical and thermal conductivities of powder compacts: Ag-C and Ag-WC

et al. 2022

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Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering

Cited by 4 publications

References 20 publications

ZnO nanoparticles and compositional dependence of structural, thermal, mechanical and electrical properties of eutectic SAC355 lead-free solder

ZnO nanoparticles and compositional dependence of structural, thermal, mechanical and electrical properties of eutectic SAC355 lead-free solder

The production of open cell Ni-foam using KBr as spacer and oxidation shield via powder metallurgy technique

Effect of temperature on electrical and thermal conductivities of powder compacts: Ag-C and Ag-WC

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