摘要
石蜡是一种高储热密度的有机相变材料,但是热导率低和易泄漏的缺点限制其进一步发展。为提高石蜡的导热和防泄漏性能,本研究以天然纤维为模板制备了具有高导热性的纤维状氧化铝导热填料,通过真空浸渍混合法制备了氧化铝纤维/石蜡复合相变材料,并对其形貌、热导率、相变循环稳定性、防泄漏性能以及热响应性能进行测试。结果表明,随着填料含量的增加,复合相变材料的导热系数近似线性增加。1200℃高温烧结形成的α型Al_(2)O_(3)比1000℃低温烧结γ型Al_(2)O_(3)具有更高的导热性能,且α型氧化铝纤维填充量达到45%(质量分数,余同)时,导热系数达到最高值为0.69 W/(m·K),是纯石蜡的2.9倍。通过对3种不同填充量Al_(2)O_(3)纤维进行100次的热循环测试,复合相变材料的相变焓值基本不变,说明了其具有良好的热循环稳定性。同时对复合相变材料的防泄漏性能以及热响应性能进行测试,结果显示30%和45%填料的α型Al_(2)O_(3)纤维均具有较好的防泄漏以及快速热响应能力。
Paraffin wax is an organic phase-change material with high heat storage density,but its low thermal conductivity and easy leakage limit its further development. To improve the thermal conductivity and anti-leakage properties of a paraffin phase-change material(PCM),Al_(2)O_(3)fibers as the thermal conductive fillers were synthesized via a template method using natural fibers. The composite PCM was synthesized using a simple vacuum impregnation method. The microstructure, thermal conductivity, phase-change cycle stability, anti-leakage performance, and thermal response performance of Al_(2)O_(3)fibers/paraffin PCMs were evaluated.The results show that the thermal conductivity increased linearly with the Al_(2)O_(3)fiber content.Particularly, the α-Al_(2)O_(3)produced via sintering at a high temperature of 1200 ℃ exhibited higher thermal conductivity than the γ-Al_(2)O_(3). When the mass ratio of α-Al_(2)O_(3)reached 45%(mass), the thermal conductivity increased to 0.69 W/(m·K), which was 290% compared to pure paraffin. After 100 thermal cyclic tests, the phase-change enthalpy of the Al_(2)O_(3)fibers/paraffin PCMs remained almost unchanged, indicating that the composite had good cycle stability. As the result of the leakage and thermal response tests, the composites filled to 30%and 45% also showed, good shape stability and heat transfer property. This will promote their practical application in thermal energy storage.
作者
郭云琪
盛楠
朱春宇
饶中浩
GUO Yunqi;SHENG Nan;ZHU Chunyu;RAO Zhonghao(School of Low Carbon and Power Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2022年第2期511-520,共10页
Energy Storage Science and Technology
基金
国家自然科学基金项目(52006238)
江苏省自然科学基金(BK20200635)。
关键词
相变材料
复合材料
生物模板
储热
传热
phase-change material
composites
biotemplating
heat storage
heat transfer
