Thermal properties of Al–Si/Al2O3 core–shell particles prepared by using steam hydration method

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In this study, Al–Si/Al2O3 core–shell structured particles with a high heat storage were fabricated by keeping Al–Si alloy powder in pressurized steam for 0.5 h followed by heating at 900 °C and 1100 °C for 3 h, respectively. Both the melting and solidification point of termination for Al–Si/Al2O3 core–shell structured particles were delayed if the heating and cooling rate were too fast. The effect of heating and cooling rate on the latent heat was not obvious. Al–Si/Al2O3 core–shell structured particles prepared at 900 °C possessed relatively uniform shell and high latent heat, 292.0 J g−1, 74.8% of that of raw material. Even after 300 thermal cycles, the heat storage and heat release of this particles were still approximately 90% and 81% of that of particles before thermal cycling, while that of particles prepared at 1100 °C were 81.3% and 61.3%, respectively. The particles prepared at 900 °C has potential to be used as heat storage material or as raw material to fabricate heat storage ceramic such as ceramic honeycombs, ceramic heat storage balls and checker bricks, etc.