Enhanced thermal conductivity and mechanical properties of a GNP reinforced Si<sub>3</sub>N<sub>4</sub> composite

Saleem, Adil; Zhang, Yujun; Gong, Hongyu; Majeed, Muhammad K.; Jing, Jie; Lin, Xiao; Ashfaq, M. Zeeshan

doi:10.1039/c9ra09286b

Cited by 26 publications

(15 citation statements)

References 49 publications

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“…This agrees with previous studies [49][50][51][52]. On the other hand, the density of Si 3 N 4 measured herein is higher than that of some reported results in the literature [2,40,46,53,54]. Ratzker et al [2] have stated that although 500 MPa pressure was applied during spark plasma sintering, they achieved only ~67% relative density for Si 3 N 4 without using sintering additives.…”

Section: Densification Behavior and Phase Evolutionsupporting

confidence: 91%

“…This could be related to the formation of more α-TCP, which has a lower density (2.86 g/cm 3 ) than that of β-TCP. A similar adverse effect of GNPs on densification behavior was also reported for hot-pressed Si 3 N 4 -GNP and spark plasma sintered Al 2 O 3 -GNS (graphene nanosheet) composites, respectively [40,66].…”

Section: Densification Behavior and Phase Evolutionsupporting

confidence: 75%

“…Ceja-Cardenas et al [46] have prepared spark plasma sintered Si 3 N 4 without using sintering additives and reported a very low relative density, ~65%. Saleem et al [40] have reported a relative density of ~96.5 for hot-pressed Si 3 N 4 , although they used sintering additives. Miyazaki et al [53] have achieved the highest relative density as ~98.4 for Si 3 N 4 with 1 mol% MgO and 7 mol% Yb 2 O 3 .…”

Section: Densification Behavior and Phase Evolutionmentioning

confidence: 99%

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Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

Bozkurt

Akarsu

Akin

et al. 2021

Journal of Asian Ceramic Societies

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The aim of this study is to produce highly dense Si 3 N 4 based composites with good mechanical properties and bioactivity. Si 3 N 4 ceramics without using sintering aids, Si 3 N 4-HA and Si 3 N 4-HA-GNP based composites have been produced by spark plasma sintering (SPS) at temperatures of 1525-1550°C. The effect of reinforcement type and content on the densification behavior, phase analysis, microstructural development, mechanical properties, and in-vitro bioactivity behavior of Si 3 N 4 were systematically investigated. Monolithic Si 3 N 4 that contains a high amount of β-Si 3 N 4 phase (~87 wt%) was produced by nearly full densification (~99%). Hydroxyapatite (HA) was used as a starting powder during the preparation of binary and triple composites to provide bioactivity to Si 3 N 4 , and after sintering, HA transformed into tricalcium phosphate (β-TCP and α-TCP) polymorphs. The incorporation of GNPs had a positive effect on the stability of β-TCP phases at higher sintering temperatures. The improvement in indentation fracture toughness of the samples with GNP reinforcement was mainly attributable to pull-out and crack deflection mechanisms. In-vitro bioactivity of GNP added composites enhanced with increasing α-TCP content. More calcium phosphate-based particle formation was observed in Si 3 N 4-HA-GNP composites compared to the Si 3 N 4-HA.

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Section: Densification Behavior and Phase Evolutionsupporting

confidence: 91%

Section: Densification Behavior and Phase Evolutionsupporting

confidence: 75%

Section: Densification Behavior and Phase Evolutionmentioning

confidence: 99%

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Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

Bozkurt

Akarsu

Akin

et al. 2021

Journal of Asian Ceramic Societies

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“…The density measurement error increases with the h-BN content, which is connected with the h-BN distribution, water adsorption to agglomerates, and a possible absence of h-BN after the HP graphite foil removal. The existence of hexagonal boron nitride agglomerates can lead to a decrease of the material friction coefficient [ 21 , 23 ]. Such agglomerates can strongly adsorb a large amount of water from the atmosphere, which was visible on the dilatometric curve changes as a negative jump on the curve.…”

Section: Resultsmentioning

confidence: 99%

“…For lower contents of h-BN, there is a slight increase of heat transfer due to the high material densification above 99%, low content of flat defects (interphase boundary), and second 2D high conductive phase and low material anisotropy ( Figure 11 ). A similar situation occurs when using a low quantity of graphene powder (GNP), where a small amount of 2D particles leads to an increase of thermal conductivity [ 23 ]. In the case of parallel direction to the pressing axis ( Figure 18 ), at lower temperatures diffusivity decreases with the h-BN addition higher than 4 vol.%.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

et al. 2020

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This work concerns boron carbide matrix composites with the addition of hexagonal boron nitride particles (h-BN) as a solid lubricate. The composite materials were hot-pressed and analysed in terms of phase, structure, and microstructure changes in relation to the h-BN content. The uniaxial pressure applied during the manufacturing process allowed the orientation of single h-BN particles and its agglomerates in perpendicular direction to the pressing axis. The anisotropy of heat transfer and thermal expansion coefficient (CTE) and density changes in relation to temperature are discussed. Thermal diffusivity and conductivity were measured in relation to the material direction by the laser flash analysis method (LFA). In this paper, understanding the heat flow and CTE changes allowed explaining the results of investigated subtractive laser processes of the manufactured composites. The laser ablation process was conducted on B4C/h-BN composites in parallel and perpendicular direction to each other. It was done in a continuous work (CW) mode at 50 W with a 40 µm spot and 3 mm/s beam travel speed. The influence of h-BN particles and their orientation on thermal properties is discussed. The effect of laser processing on B4C/h-BN composites was also discussed in relation to the material surface roughness measured with a confocal microscope, microstructure observations, density, and thermal properties changes in relation to the material direction.

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Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

Yusuf,

Sapuan,

Rashid

et al. 2023

Polymer Composites

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The efficient inclusion of GNPs (graphene nanoplatelets) as an effective nano‐fillers for green polymer matrices produced with 28% of carbon originating from biomass tends to significantly improve mechanical and thermal properties. In the present work, green epoxy nanocomposites with low loading of (0.1, 0.25, and 0.5) wt% of the GNPs were made using a solution blending technique using acetone as the solvent. In mechanical stirring, the ultrasonic bath was used to ensure the efficient dispersion of GNPs within green epoxy. The resulting nanocomposites were comprehensively characterized and compared to unfilled green epoxy. Different tools were used to appraise morphological, thermal, thermo‐mechanical, and mechanical behavior. The results confirmed through FE‐SEM showed an optimal dispersion of GNPs with nanocomposites. The thermal degradation temperature (Td) of GNPs curve with 0.25 wt% loading was shifted toward higher temperature (from 336°C to 342°C) due to low percentage of loading of GNPs which showed an enhance thermal stability of polymer matrix with 0.25 wt% loading. The mechanical results were also in lined with previously published literature, in the tensile test 6.45% and hardness 13.3% increment was achieved. Overall, the results underscored significant improvements in green nanocomposite performance with low wt% of GNPs.Highlights The study focuses on development and characterization of green epoxy nanocomposites, which utilize environmentally friendly materials as a matrix, highlighting the significance of sustainability. The study explores effects of low loading of GNPs in green epoxy nanocomposites. The results demonstrate significant improvements in mechanical and thermal properties with optimized presence of GNPs. This investigation provides insights into optimal amount of GNPs required to achieve improved properties. Research evaluates multifaceted analysis provides a holistic understanding of performance enhancements achieved through inclusion of GNPs.

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Enhanced thermal conductivity and mechanical properties of a GNP reinforced Si₃N₄ composite

Abstract: Graphene nanocomposites can significantly enhance the thermal conductivity and mechanical properties of ceramics at relatively low nano-filler addition.

Cited by 26 publications

References 49 publications

Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

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Enhanced thermal conductivity and mechanical properties of a GNP reinforced Si3N4 composite

Abstract: Graphene nanocomposites can significantly enhance the thermal conductivity and mechanical properties of ceramics at relatively low nano-filler addition.

Cited by 26 publications

References 49 publications

Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

Phase analysis, mechanical properties and in vitro bioactivity of graphene nanoplatelet-reinforced silicon nitride-calcium phosphate composites

The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

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Enhanced thermal conductivity and mechanical properties of a GNP reinforced Si₃N₄ composite