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以苏州土和Al-12Si合金粉为原料，通过埋粉烧结法制备Al_2O3-SiCw复合陶瓷储热材料，研究了烧成温度对样品的物相相成、显微结构、物理性能以及热物理性能的影响。研究结果表明：SiC晶须(SiCw)通过气±固(V-S)机制生长。Al-12Si合金在1450℃消耗完全，此时SiC的生成量最多。经1450℃烧成样品的气孔率最高，但其抗压强度最好，说明SiC可以抵消气孔给强度造成的负面影响。经1450℃烧成样品的热膨胀系数为5.56×10-6/℃，原位合成的SiCw有效地降低了复合储热材料的热膨胀系数。1500℃为样品的最佳烧成温度，样品的致密性较好，气孔率和吸水率分别为36%和16%，抗压强度为153.6 MPa。样品的热导率最高为4.02 W·(m·K)-1，比热容为0.94J·(g·K)-1，理论储热密度为785.12 J/g(计算温度范围为25～1000℃)。
Abstract：Al_2O3-SiCw composite ceramic thermal storage materials were prepared by the buried powder sintering method using Suzhou soil and Al-12 Si alloy powder as raw materials. The effects of sintering temperature on the phase composition, microstructure, physical properties and thermal physical properties of the samples were investigated. The results show that SiC whisker(SiCw) grows through the vaporsolid(V-S) mechanism. The Al-12 Si alloy is completely consumed at 1450 ℃, at which point the amount of SiC is maximized. Samples sintered at 1450 ℃ exhibit the highest porosity but the best compressive strength, indicating that SiC can offset the negative impact of porosity on strength. The thermal expansion coefficient of the sample sintered at 1450 ℃ is 5.56×10-6/℃, indicating that the in-situ synthesized SiCw effectively reduces the thermal expansion coefficient of the composite thermal storage material. The optimal sintering temperature for the sample is 1500 ℃, where the samples show good density, porosity and water absorption rate of 36% and 16%, respectively, and compressive strength of 153.6 MPa. The highest thermal conductivity of the sample is 4.02 W·(m·K)-1, specific heat capacity is 0.94 J·(g·K)-1, and theoretical heat storage density is 785.12 J/g(calculated temperature range of 25 ～ 1000 ℃).
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基本信息:
DOI：10.16521/j.cnki.issn.1001-9642.2026.01.002
中图分类号:TQ174.7
引用信息:
[1]毛志欢,劳新斌,徐笑阳,等.利用苏州土制备Al_2O_3-SiC_w复合陶瓷储热材料的研究[J].中国陶瓷,2026,62(01):9-16.DOI:10.16521/j.cnki.issn.1001-9642.2026.01.002.
基金信息:
国家自然科学基金（52202063,52262007,51962012）; 江西省自然科学基金（20242BAB22012,2022BAB204022,20204BCJ23005）