The Effect of Liquidus Aging on The Performance of Phase-Stabilized Wax with Solid Nano Additives


  • Dwi Rahmalina Department of Mechanical Engineering, Universitas Pancasila, Indonesia
  • La Ode Mohammad Firman Department of Mechanical Engineering, Universitas Pancasila, Indonesia
  • Ismail Ismail Department of Mechanical Engineering, Universitas Pancasila, Indonesia
  • Reza Abdu Rahman Department of Mechanical Engineering, Universitas Pancasila, Indonesia



dendrite, hydrocarbon wax, phase stabilizer, polyethylene, solid additives


The present work assesses phase stabilized HW (hydrocarbon wax) with nano additives through liquidus aging treatment. The aging treatment is performed by storing the sample in the liquid phase at 130 °C for 250 hours. The sample performance is assessed according to the heating and cooling rate change before and after aging treatment. The finding indicates a severe decrement in the heating rate of thermal conductivity enrichment (TCE)-HW up to 24.4% and 7.5% for the discharge rate. The phase-stabilized HW performs better according to its heating rate, which only decreases by around 10.9% and the discharge rate by only 1.2%. The heating profile for HW shows a distinctive phenomenon, indicated by a two-step temperature spike of 6.8 °C and 11.8 °C at the solid-solid and solid-liquid transition. Contrary to that, the SHW presents a suitable profile where the temperature increases steadily until 86.3 °C with the average heating rate around 2.97 °C/min. The surface observation shows that the phase-stabilized polyethylene (HDPE) decreases the potential of void formation. As a result, the SHW maintains suitably the distribution of nano additives after aging treatment. Thus, phase stabilization is critical to ensure stable operation of HW with nano additives for the TES system.


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How to Cite

Rahmalina, Dwi, La Ode Mohammad Firman, Ismail Ismail, and Reza Abdu Rahman. 2024. “The Effect of Liquidus Aging on The Performance of Phase-Stabilized Wax With Solid Nano Additives”. Metallurgical and Materials Engineering 30 (2):1-11.