太阳能热发电用堇青石-莫来石储热陶瓷的研制

PREPARATION OF CORDIERITE-MULLITE HEAT STORAGE CERAMICS FOR SOLAR THERMAL POWER GENERATION

以煅烧铝矾土、滑石和石英为原料,设计太阳能热发电储热用原位合成堇青石-莫来石复相陶瓷组成并制备样品,采用XRD、SEM等现代测试技术对样品的性能及微结构进行研究。探讨样品相组成及微观结构对储热陶瓷样品抗热震和储热性能的影响。结果表明,原位合成四方柱状莫来石结合原位合成条柱状堇青石可显著提高样品的抗热震性能和储热性能;经1450℃烧成的堇青石-莫来石复相储热陶瓷样品热膨胀系数为3.64×10^(-6)K^(-1)(室温~850℃);储热密度为1416 kJ/kg(0~800℃);热震30次(室温~800℃,气冷)不开裂,且热震后抗折强度增长了28.11%。满足太阳能热发电显热储热材料的要求。

The in-situ synthesis cordierite-mullite heat storage composite ceramics was prepared from calcined bauxite, talc and quartz. The performances and microstructures of the samples were tested by XRD, SEM and so on. The influence of different phase content and microstructure on thermal shock resistance and heat storage performance was discussed. The results show that the thermal shock resistance and heat storage performance of samples can be significantly improved by in-situ synthesis square column mullite combined with in-situ synthesis columnar cordierite. The thermal expansion coefficient and heat storage density of the sample sintered at 1450 ℃ are 3.64× 10-6 K- （from room temperature to 850 ℃） and 1416 kJ/kg （0-800 ℃）, respectively. The sample isn＇t cracked after 30 times thermal shock resistance tests （from room temperature to 800 ℃, air cooling）, but the growth requirement of thermal energy storage ceramics for solar thermal rate of bending strength raises 28.11%, which meets the power generation.