通过在八水氢氧化钡中添加成核剂磷酸二氢钾和强化传热材料膨胀石墨,利用真空吸附法制备了膨胀石墨/八水氢氧化钡复合定型相变材料.采用Leica DM6000M显微镜,“步冷曲线法”和量热法对其热性能进行了表征和测试,结果发现,添加0.5％～2％的磷酸氢二钾可使八水氢氧化钡的过冷度由11.4℃降低到0.5℃以内,1％ ～3％的膨胀石墨可使过冷度降低到4℃.复合定型相变材料的较优组成为:93％Ba(OH)2·8H2O+6％EG+1％KH2PO4时,其相变潜热为248.3 kJ/kg,与纯物质相比可缩短储热时间45.1％,缩短放热时间54.5％,且相变中无液态产生,是较好的“固-固”定型复合相变材料.
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