Microstructural evaluation and mechanical properties of in-situ WC/W-Cu composites fabricated by rGO/W-Cu spark plasma sintering reaction

Dong, Longlong; Huo, Wangtu; Ahangarkani, M.; Zhang, B.; Zhang, Yongqing; Zhang, Y.S.

doi:10.1016/j.matdes.2018.11.004

Cited by 35 publications

(28 citation statements)

References 35 publications

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“…However, for the as-sintered GONs/TC4 sample, a slightly decreased AS3/A2D value (0.8956) is obtained if compared with that of 0.9584 for the pre-mixed powders. This is mainly due to the reduction of the GONs into GNPs structure because of the diminution of oxygen containing functional groups (which has been verified by the XPS analysis shown in Figure S3) during ball milling and sintering process [42][43][44][45]. This can also be confirmed from the weak and broad 2D peaks Table 2 The detailed Raman spectrum results of samples in this work.…”

Section: Microstructures Of Carbonaceous Materialssupporting

confidence: 70%

“…Previous studies about the Cu matrix composites using reduced oxide graphene (rGO) and carbon nanotubues (CNTs) as carbon sources have shown that interfacial carbides are preferentially formed at the defective sites of the rGO and CNTs, because of the highly reactive nature of carbon atoms in these defects (pristine and produced) regions, as well as easy formation of carbides [45,[57][58][59]. Therefore, the defect structures and distribution of carbon sources play critical roles in the nucleation and growth of carbides.…”

Section: Formation Process Of Interfacial Characteristicsmentioning

confidence: 99%

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Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms

Dong

et al. 2020

Carbon

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110

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Section: Microstructures Of Carbonaceous Materialssupporting

confidence: 70%

Section: Formation Process Of Interfacial Characteristicsmentioning

confidence: 99%

Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms

Dong

et al. 2020

Carbon

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110

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“…This result was further confirmed by selected area electron diffraction (SAED) patterns for both sides at the interface. The SAED pattern highlighted by the dashed yellow square demonstrated a crystalline nature corresponding to the (100) and (002) planes of GCN, 18 while the one highlighted by the dashed white square on the other side of the interface corresponds to the rGO sheets 27 . These results confirm the formation of the rGO/GCN heterojunction nanocomposite, in which GCN is uniformly anchored on the rGO sheets upon laser irradiation of the GO/GCN dispersion.…”

Section: Resultssupporting

confidence: 63%

Anchoring of graphitic carbon nitride on reduced graphene sheets by UV pulsed laser irradiation for augmented photoelectrochemical water splitting

et al. 2021

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Summary Recently graphitic carbon nitride (GCN) has gained a great significance as it is one of the most suitable materials for large‐scale photocatalytic water splitting because, it has a narrow band gap energy, photoelectrochemical stability, non‐toxicity, and low‐cost production. However, bare GCN is not reliable in terms of its relatively poor intrinsic photoelectrochemical performance as it possesses a low surface area, a high recombination rate of photo‐induced charge carriers, and poor adhesion to the current collector. Here, we report a green, and low‐cost approach to anchor GCN on reduced graphene oxide (rGO) sheets, forming rGO/GCN colloidal nanocomposite by simply irradiating a GO/GCN dispersion in methanol aqueous solution using a UV laser without further treatment. In contrast with the bare GCN, the synthesized rGO/GCN nanocomposite exhibited a higher tendency of visible light absorption (400‐700 nm), a lower recombination rate of photo‐induced charge carriers, excellent adhesion on the current collector, and thus higher photoelectrochemical efficiency for water splitting under visible light illumination. The photocurrent density of the rGO/GCN photoanode was enhanced by nine folds (~90 mA cm−2) in alkaline media over that one produced by the bare GCN under the same operating conditions. This study exhibits the feasibility and effectiveness of UV laser irradiation in the synthesis of high‐purity rGO‐based photocatalytic nanocomposites at room temperature for large‐scale photoelectrochemical water splitting.

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“…Previous studies of Cu matrix composites using reduced graphene oxide (rGO) and CNTs as the carbon sources have shown that interfacial carbides are preferentially formed at the defective sites of the rGO and CNTs because of the highly reactive nature of carbon atoms in these defects (pristine and produced) regions, as well as easy formation of carbides. [ 25–28 ] Therefore, the defect structures and distribution of carbon sources play critical roles in the nucleation and growth of these carbides. Figure 2g schematically summarizes the mechanisms for interfacial TiC phase formation and the evolution of GNPs during the ball milling process.…”

Section: Resultsmentioning

confidence: 99%

Controlled Interfacial Reactions and Superior Mechanical Properties of High Energy Ball Milled/Spark Plasma Sintered Ti–6Al–4V–Graphene Composite

et al. 2021

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Ball milling process has become one of the effective methods for dispersing graphene nanoplates (GNPs) uniformly into matrix; however, there are often serious issues of structural integrity and interfacial reactions of GNPs with matrix. Herein, GNPs/Ti‐6Al‐4V (GNPs/TC4) composites are synthesized using high energy ball milling (HEBM) and spark plasma sintering. Effects of ball milling on microstructural evolution and interfacial reactions of GNPs/TC4 composite powders during HEBM are investigated. As ball milling time increase, particles size of TC4 is first increased (e.g., ≈104.15 μm, 5 h), but then decreased to ≈1.5 μm (15 h), which is much smaller than that of original TC4 powders (≈86.8 μm). TiC phases are in situ formed on the surfaces of TC4 particles when ball milling time is 10Thinsp;h. GNPs/TC4 composites exhibit 36–103% increase in compressive yield strength and 57–78% increase in hardness than those of TC4 alloy, whereas the ductility is reduced from 28% to 7% with an increase of ball milling time (from 2 to 15 h). A good balance between high strength (1.9 GPa) and ductility (17%) of GNPs/TC4 composites is achieved when the ball milling time is 10 h, attributing to the synergistic effects of grain refinement strengthening, solid solution strengthening, and load transfer strengthening from GNPs and in situ formed TiC.

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Microstructural evaluation and mechanical properties of in-situ WC/W-Cu composites fabricated by rGO/W-Cu spark plasma sintering reaction

Cited by 35 publications

References 35 publications

Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms

Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms

Anchoring of graphitic carbon nitride on reduced graphene sheets by UV pulsed laser irradiation for augmented photoelectrochemical water splitting

Controlled Interfacial Reactions and Superior Mechanical Properties of High Energy Ball Milled/Spark Plasma Sintered Ti–6Al–4V–Graphene Composite

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