Enhanced mechanical and electrical properties of in situ synthesized nano-tungsten dispersion-strengthened copper alloy

Lu, Tianxing; Chen, Cunguang; Li, Pei; Zhang, Chenzeng; Han, Weihao; Zhou, Yang; Suryanarayana, C.; Guo, Zhimeng

doi:10.1016/j.msea.2020.140161

Cited by 49 publications

(6 citation statements)

References 48 publications

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“…Due to the excessive addition of Zr in the matrix, non-solution Zr exists as pure Zr particles and Cu 5 Zr intermetallic compound particles. It was reported that nano and submicron particles had the dispersion strengthening on Cu [ 34 , 35 ]. Therefore, it can be inferred that the incompletely diffused nano Zr and Cu 5 Zr particles locally strengthen the Cu matrix, which improves the overall mechanical property of the composite.…”

Section: Resultsmentioning

confidence: 99%

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

Cui

Yu²,

et al. 2020

Materials

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Highly-aligned flake graphite (FG) reinforced Cu matrix composites with high thermal conductivity and adaptive coefficient of thermal expansion were successfully prepared via the collaborative process of tape-casting and hot-pressing sintering. To overcome the problem of fragile interface, Zr-Cu alloy powder was introduced instead of pure Zr powder to enhance the interfacial strength, ascribed to the physical-chemical bonding at the Cu-FG interface. The results indicate that the synthetic ZrC as interfacial phase affects the properties of FG/Cu composites. The thermal conductivity reaches the maximum value of 608.7 W/m∙K (52% higher than pure Cu) with 0.5 wt % Zr. Surprisingly, the negative coefficient of thermal expansion (CTE) in the Z direction is acquired from −7.61 × 10−6 to −1.1 × 10−6/K with 0 to 2 wt % Zr due to the physical mechanism of strain-engineering of the thermal expansion. Moreover, the CTE in X-Y plane with Zr addition is 8~10 × 10−6/K, meeting the requirements of semiconductor materials. Furthermore, the bending strength of the FG/Cu-2 wt % Zr composite is 42% higher than the FG/Cu composite. Combining excellent thermal conductivity with ultralow thermal expansion make the FG/Cu-Zr composites be a highly promising candidate in the electronic packaging field.

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Section: Resultsmentioning

confidence: 99%

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

Cui

Yu²,

et al. 2020

Materials

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“…It may contribute to the electron scattering from the particle interface and the resistivity from grain boundaries. Besides, the impurity and the residual stress will also reduce the electrical conductivity in nanocomposite [47].…”

Section: Resultsmentioning

confidence: 99%

W and TiO₂ particles synergistic strengthened Cu matrix nanocomposites by mechano-chemical method

Chen

et al. 2020

Powder Metallurgy

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In this study, a novel W and TiO 2 synergistic strengthened copper matrix nanocomposite was prepared by a powder metallurgy route with a mechano-chemical method and subsequent consolidation. Nano-sized W and TiO 2 particles in the composite powder were fabricated by solid-phase reaction during the mechanical alloying procedure. The average sizes of W and TiO 2 particles were only 51 and 171 nm, far finer than single-phase particle-strengthened composites. It was found that the nanoparticles effectively resisted the grain coarsening in the copper matrix, containing the grains with an average size of 350 nm. The ultimate tensile strength and electrical conductivity of the copper composite are 520 MPa and 74 IACS%, achieve an ideal trade-off between them. The observations suggested that the nanoparticles were highly uniformly dispersed in the copper matrix, and the particle coarsening was restrained as the results of the interaction effects between W and TiO 2 nanoparticles.

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“…As shown in Figure 2 , a coating was produced with the same tungsten ratio throughout the calender process after mixing it with HDPE as a single material. Air bubbles were removed from the mixed material through defoaming, and this process technology was performed by focusing solely on the uniform dispersion of particles [ 31 ]. During the calendering process, the thickness was controlled by a multiroller compression method to form a sheet.…”

Section: Methodsmentioning

confidence: 99%

Metal Particle Pencil Beam Spray-Coating Method for High-Density Polymer–Resin Composites: Evaluation of Radiation-Shielding Sheet Properties

Kim

2023

Materials

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Medical shielding suits must be lightweight and satisfy the requirements of thin films to guarantee user mobility and safety. The thin film weight is related to the density and thickness, which are associated with the particle dispersion in shielding materials. An even distribution of metal particles in a polymer can maintain the spacing among them. This paper proposes a pencil beam spray-coating method that involves spraying a constant amount of a polyethylene and tungsten mixture in a thin beam onto a nonwoven fabric at a constant speed. This technique yields higher productivity than does the electrospinning method and is expected to produce materials with better shielding performance than that of materials obtained using the calender method. The shielding performance was evaluated by manufacturing shielding sheets (thickness: 0.48–0.54 mm) using the calender and pencil beam spray-coating methods under the same conditions. The densities and performances of the sheets differed significantly. The sheet manufactured using the proposed method had an even particle dispersion and exhibited 2–4% better shielding performance than did that manufactured using the calender method. Therefore, the pencil beam spray-coating method can effectively satisfy the requirements of thin films for medical radiation-shielding materials while increasing the material flexibility.

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Enhanced mechanical and electrical properties of in situ synthesized nano-tungsten dispersion-strengthened copper alloy

Cited by 49 publications

References 48 publications

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

W and TiO₂ particles synergistic strengthened Cu matrix nanocomposites by mechano-chemical method

Metal Particle Pencil Beam Spray-Coating Method for High-Density Polymer–Resin Composites: Evaluation of Radiation-Shielding Sheet Properties

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Enhanced mechanical and electrical properties of in situ synthesized nano-tungsten dispersion-strengthened copper alloy

Cited by 49 publications

References 48 publications

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

Effects of Zr-Cu Alloy Powder on Microstructure and Properties of Cu Matrix Composite with Highly-Aligned Flake Graphite

W and TiO2 particles synergistic strengthened Cu matrix nanocomposites by mechano-chemical method

Metal Particle Pencil Beam Spray-Coating Method for High-Density Polymer–Resin Composites: Evaluation of Radiation-Shielding Sheet Properties

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W and TiO₂ particles synergistic strengthened Cu matrix nanocomposites by mechano-chemical method