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在石蜡中加入不同含量的膨胀石墨制备了石蜡/膨胀石墨复合相变材料,通过测定不同膨胀石墨掺量的复合相变材料的导热系数、比热容、蓄热系数、热稳定性、热膨胀系数等参数,探究了膨胀石墨对石蜡的热工性能的影响规律。结果表明,膨胀石墨的加入,复合相变材料的导热系数呈线性增大,传热能力增强,蓄热时间缩短,蓄热系数增加,使石蜡的热效率提高;同时,冷热循环过程中,热膨胀系数减小,化学结构稳定,封装效果良好,具有较好的热循环稳定性和热化学稳定性,使石蜡的热稳定性提高。
The paraffin / expanded graphite composite phase change material was prepared by adding different content of expanded graphite in paraffin. The thermal conductivity, specific heat capacity, thermal storage coefficient, thermal stability and thermal expansion coefficient of composite phase change material with different amount of expanded graphite were measured. , Explored the impact of expanded graphite on the thermal properties of paraffin. The results show that the thermal conductivity of the composite phase change material increases linearly with the addition of expanded graphite, the heat transfer ability is enhanced, the heat storage time is shortened, the heat storage coefficient is increased, and the thermal efficiency of the paraffin wax is improved. Meanwhile, during the thermal cycling, The coefficient is reduced, the chemical structure is stable, the encapsulation effect is good, the thermal cycle stability and the thermal chemical stability are good, and the thermal stability of the paraffin wax is improved.