多孔基无机玻璃-熔盐复合相变材料蓄热性能的实验研究

基于熔融浸渗法和黏结封装法,以多孔基作为基体材料,分别采用无机玻璃粉与熔盐作为相变材料开展实验,探究储热样本的最佳制备工艺流程。考察了复合相变蓄热体的显微结构及物相组成特征,分析了复合相变蓄热材料的质量损失率,并对蓄热体进行蓄热性能分析及高温抗压强度测试。实验结果表明,采用黏结封装法,以氯化钠作为相变材料,加盖圆柱形三角孔蜂窝陶瓷基体作为载体,设定6.5℃/min的升温速率,烧结温度至800℃,保温30 min,可制备蓄热性能较为优异的复合相变蓄热材料。复合相变蓄热材料的蓄热密度为445.5 kJ/kg,该蓄热体在800℃条件下高温抗压强度达到75.9 MPa,具有良好的蓄热性能和力学性能。

Experimental Study of Thermal Storage Properties of Porous-Based Inorganic Glass-Molten Salt Composite Phase Change Materials

Experiments were employed by using the porous substrate as base material, and inorganic glass powder and sodium chloride (NaCl) as phase change material, respectively, based on melt infiltration method and bonded encapsulation, to investigate the best preparation process for the thermal storage samples. The microstructure and phase composition characteristics of the composite phase change thermal storage sample were studied, the mass loss rate of the composite phase change thermal storage material was analyzed, and the thermal storage performance and high-temperature compressive strength of the thermal storage sample were examined. The experimental study showed that, the composite phase change thermal storage material was developed by using the method of bonded encapsulation, adopting sodium chloride as the phase change material and cylindrical triangular pore honeycomb ceramic matrix with covers as the carrier, setting a temperature increase rate of 6.5^oC/min, sintering temperature to 800^oC and holding time of 30 min. The heat storage density of the composite phase change thermal storage material was 445.5 kJ/kg, and the high-temperature compressive strength of the thermal storage body was 75.9 MPa at 800^oC, which had good heat storage and mechanical properties.