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太阳能热发电用氧化铝–碳化硅–氧化锆储热陶瓷的制备及表征

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Abstract:

以α-Al2O3、部分稳定氧化锆(5.2%Y2O3,质量分数)和碳化硅为原料,采用无压烧成技术制备了太阳能热发电用Al2O3–SiC–ZrO2(ASZ)储热陶瓷,研究了碳化硅和氧化锆添加量对ASZ储热陶瓷样品结构与性能的影响。结果表明随着碳化硅添加量的增加,样品的力学性能、抗热震性和热物理性能均有提高;添加氧化锆可提高样品的力学性能和抗热震性能;经1280℃烧成的碳化硅添加量为50%、部分稳定氧化锆添加量为5%的样品的显气孔率、吸水率、体积密度和抗折强度分别为24.88%、10.44%、2.38g/cm3和66.20MPa;样品的比热容、导热系数和储热密度(600℃时)分别为1.05kJ/(kg?K),2.26W/(m?K)和916.91kJ/kg。热震试验30次(室温~800℃)样品无裂纹,强度增长率为27.89%。

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