Bentonite-based porous ceramic phase change bricks for thermal storage and fireproof protection in buildings

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2025-09-05 DOI:10.1016/j.solmat.2025.113937

Peng Gong , Lei Wang , Junyu Lu , Fei Liu , Pan Guo

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引用次数: 0

Abstract

Phase change materials (PCMs) are promising for building energy efficiency and clean energy utilization, but their practical application is hindered by low thermal conductivity, poor shape stability, and inadequate fire resistance. Herein, bentonite (BT)-based porous ceramic-supported paraffin (PW) phase change bricks were fabricated via calcination (with carbon powder as pore-forming agent) and vacuum impregnation. Morphological analysis showed interconnected porous structures, with PBT40 (green body: 60 % BT, 40 % carbon powder) exhibiting more pores due to higher carbon content. The phase change bricks maintained stable phase transition temperatures and excellent cyclic stability after 200 thermal cycles. PW/PBT30 achieved a 3.5-fold enhancement in thermal conductivity (0.84 W m⁻¹ K⁻¹) compared to pure PW, coupled with superior shape stability (mass retention rate >95 %) and fire resistance. Additionally, PW/PBT30 (PBT30: green body: 70 % BT, 30 % carbon powder) showed a solar-thermal conversion efficiency of 82 %. These results highlight the potential of the BT-based phase change bricks for building energy efficiency and clean energy applications.

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建筑储热防火用膨润土基多孔陶瓷相变砖

相变材料（PCMs）在建筑节能和清洁能源利用方面具有广阔的前景，但其实际应用受到导热系数低、形状稳定性差和耐火性不足的阻碍。以膨润土（BT）基多孔陶瓷负载石蜡（PW）相变砖为研究对象，通过煅烧（碳粉为成孔剂）和真空浸渍法制备了多孔陶瓷负载石蜡相变砖。形态学分析表明，PBT40（绿体：60% BT， 40%碳粉）由于含碳量高，气孔较多。经过200个热循环后，相变砖保持了稳定的相变温度和良好的循环稳定性。与纯PW相比，PW/PBT30的导热系数（0.84 W m−1 K−1）提高了3.5倍，同时具有优异的形状稳定性（质量保持率>； 95%）和耐火性。此外，PW/PBT30 （PBT30：绿体：70% BT， 30%碳粉）的光热转换效率为82%。这些结果突出了基于bt的相变砖在建筑节能和清洁能源应用方面的潜力。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.