Governing the Inclination Angle of Graphite Flakes in the Graphite Flake/Al Composites by Controlling the Al Particle Size via Flake Powder Metallurgy

doi:10.1007/s40195-019-00994-0

Abstract

Abstract:

The inclination angle of the flake particle has a significant impact on the in-plane thermal conductivity of composites. The graphite flake/Al composites (50 vol%) with different inclination angles were fabricated via flake powder metallurgy, and the results show that with increasing the size of Al particle from 25.6 to 50.7 μm, the inclination angle of graphite flake decreases from 7.3° to 4.4°, while the in-plane thermal conductivity of composites increases from 473 to 555 Wm^-1 K^-1. Based on the rules of mixture, an effective model was established to qualify and quantify the relation between the inclination angle and the in-plane thermal conductivity of the corresponding composites. This model can also be applied to other flake particle-reinforced composites.

Key words: Inclination angle, Flake powder metallurgy, Thermal conductivity model, Metal matrix composites

Dong Li, Chaoyu Wang, Yishi Su, Di Zhang, Qiubao Ouyang. Governing the Inclination Angle of Graphite Flakes in the Graphite Flake/Al Composites by Controlling the Al Particle Size via Flake Powder Metallurgy[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(5): 649-658.

Figures/Tables 10

Fig. 1 a Schematic of the inclination angle of Gf. b Schematic of uniaxial pressure method. The specimens to measure the thermal diffusivity: c transverse diffusivity, d in-plane diffusivity

Fig. 2 SEM images of graphite flake: a front view; b side view

Fig. 3 SEM images and particle size distributions of Al particle with different milling times: a 0 min; b 30 min; c 60 min; d 90 min; e 120 min

Table 1 Properties of Al particle and Gf/Al composites

Fig. 4 Microstructures of the composites (50 vol%) and inclination angle distributions of Gf with different milling times of Al particle: a 0 min; b 30 min; c 60 min; d 90 min; e 120 min

Fig. 5 Schematic of the Al particle effect (blue arrow depicts the resultant force of Al particle assembly): a sand model, b pebble model, c tile model

Fig. 6 Schematic of the decomposition of Gf (blue line depicts the inner graphene layers from the side view)

Fig. 7 Microstructures of composites with different Gf fractions and milling times: a 30 vol%, 0 min; b 30 vol%, 120 min; c 70 vol%, 0 min; d 70 vol%, 120 min. TC of composites with different Gf fractions and milling times: e in-plane TC; f transverse TC

Fig. 8 Schematic of R1 and R2

Fig. 9 Comparison of experimental data with the theoretical predictions by the decomposition model when f equals 50 vol%: a overview; b amplification of the green circle area

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