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Experimental study on the properties of fly ash-steel slag composite phase change heat storage materials
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Yanan SU1, Yaxuan XIONG1, 2, Meng LI1, Meichao YIN1, Miao HE1, Yuting WU3, Cancan ZHANG3, Yulong DING4
Thermal Power Generation | 2026, 55(5) : 33 - 41
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Thermal Power Generation | 2026, 55(5): 33-41
• Energy storage and renewable energy technology •
Experimental study on the properties of fly ash-steel slag composite phase change heat storage materials
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Yanan SU1, Yaxuan XIONG1, 2, Meng LI1, Meichao YIN1, Miao HE1, Yuting WU3, Cancan ZHANG3, Yulong DING4
Affiliations
  • 1.Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102600, China
  • 2.Institute of Advanced Materials, Beijing University of Civil Engineering and Architecture, Beijing 102600, China
  • 3.Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
  • 4.Birmingham Center for Energy Storage, University of Birmingham, Birmingham B15 2TT, UK
Published: 2026-05-25 doi: 10.19666/j.rlfd.202507136
Outline
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In response to the escalating energy crisis and the mounting pressure associated with industrial solid waste disposal, the development of efficient and stable composite phase change heat storage materials is of paramount significance. This study uses solar salt as the phase change medium, with steel slag and fly ash employed as porous skeleton materials. A novel composite phase change heat storage material is synthesized via the cold pressing and hot sintering process. Through systematic optimization of material composition, the optimal mass ratio is determined as fly ash: steel slag: solar salt equal to 25:25:50. The characterization results demonstrate excellent chemical compatibility among the composite components, with no formation of new phases. The composite exhibits superior thermal energy storage performance, with a phase change latent heat of 57.96 J/g, a heat storage density of 291.968 J/g within the temperature range of 100~400 ℃ and a thermal conductivity of 0.952 W/(m·K). Mechanical property testing reveals a high compressive strength of 55.0 MPa. Crucially, the material maintains stable phase change behavior and structural integrity after 3 600 thermal cycles, with a mass loss rate below 0.05%. This research not only facilitates the high-value-added utilization of industrial solid wastes but also provides novel insights into the material design for medium and high-temperature thermal energy storage systems.

fly ash  /  steel slag  /  solar salt  /  composite phase change heat storage  /  heat storage performance
Yanan SU, Yaxuan XIONG, Meng LI, Meichao YIN, Miao HE, Yuting WU, Cancan ZHANG, Yulong DING. Experimental study on the properties of fly ash-steel slag composite phase change heat storage materials[J]. Thermal Power Generation, 2026 , 55 (5) : 33 -41 . DOI: 10.19666/j.rlfd.202507136
Funding
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  • Science and Technology General Project of Beijing Municipal Education Commission(KM202210005016)
Appendix
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Year 2026 volume 55 Issue 5
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Article Info
doi: 10.19666/j.rlfd.202507136
  • Receive Date：2025-07-25
  • Online Date：2026-08-14
  • Published：2026-05-25
Article Data
Affiliations
History
  • Received：2025-07-25
  • Revised：2025-08-28
  • Accepted：2025-09-04
Funding
Science and Technology General Project of Beijing Municipal Education Commission(KM202210005016)
Affiliations
    1.Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102600, China
    2.Institute of Advanced Materials, Beijing University of Civil Engineering and Architecture, Beijing 102600, China
    3.Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
    4.Birmingham Center for Energy Storage, University of Birmingham, Birmingham B15 2TT, UK
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202507136
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光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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