封装相变材料的红柱石蜂窝陶瓷储热材料及储热装置的研究

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the international advanced level.

Key Words:Solar Thermal Power;Fringe Reflection Technique;Four-step Phase-shifting Algorithm

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封装相变材料的红柱石蜂窝陶瓷储热材料及

储热装置的研究

吴建锋(武汉理工大学)

摘 要：设计了原位生成堇青石结合红柱石陶瓷的组成，采用无压烧成法研制了原位生成堇青石结合红柱石L系列复相陶瓷，探讨了提高红柱石复相陶瓷的抗热震性能的途径。研究结果表明：经1400℃烧成的L4样品（红柱石70%，滑石13%，高岭土13%，γ-氧化铝4%）的综合性能最佳，其吸水率（Wa）为10.71%，气孔率（Pa）为22.95%，体积密度（D）为2.14g/cm3;，烧成收缩为2.98%，抗折强度（σb）为92.74MPa。热膨胀系数为5.41×10-6/℃，30次热震实验（热震条件：1100℃～室温，风冷）的强度没有损失，反而增加了26.20%，常温导热系数为1.87 W/(m·K)，比热容为0.90 kJ/(kg·K)，储热密度为900 kJ/kg（0～1000℃）。相组成分析表明样品的晶相组成为印度石（高温堇青石），莫来石，硅线石，α-方石英，α-石英等，原位生成的堇青石晶体均匀分布在莫来石晶体之间，赋予样品较好的抗热震性能。结果显示，采用原位生成堇青石结合

红柱石制备的陶瓷材料能满足太阳能高温热发电储热材料良好的抗热震性能，耐高温，高强度的要求。

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Study of Andalusite Honeycomb Thermal Storage MaterialsEncap-sulated PCM and the Thermal Storage Device

Wu Jianfeng

(Wuhan University of Technology,WUT)

Abstract：In-situ synthesizing cordierite combined with andalusite was used to improve the thermal shock resistance of thesamples. The research showed that formula L4 ( Andalusite 70%, Talcum 13%, Kaolin 13%,γ-Al2O3 4%) fired at 1400 ℃had the best performance. The properties were listed as followings: apparent porosity 22.95%, water absorption 10.71%, bulkdensity 2.14 g/cm3, firing shrinkage 2.98%, bending strength 92.74 MPa. After 30 times thermal shock cycles (1100 ℃～RT,air cooling), the loss rate of bending strength of L4 samples was -26.20%. The coefficient of thermal expansion, heatcapacity, and thermal storage density of series L4 were 1.87 W/(m·K), 0.90 kJ/(kg·K) and 900 kJ/kg（0～1000 ℃）respectively. The phase composition analysis indicated that cordierite, mullite, sillimanite,α-cristobalite and α-quartz werethe phases of samples. Cordierite crystals dispersed in the mullite crystals,and gift samples better thermal shock resistance.The results indicated that the in-situ synthesizing cordierite combined with andalusite ceramics could met the requirementsof thermal shock resistance,withstand high temperatures and high strength of heat storage material of solar thermal powergeneration.

Key Word：Andalusite;Cordierite;Thermal Storage Ceramic;Phase Change Material;Thermal Storage Device；Solar Thermal

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