【摘要】 为研究Al₂O₃粒度对CA₆轻质陶瓷材料结构与性能的影响，本文以平均粒径分别为80、61、45和38μm的α-Al₂O₃为氧化铝源，以平均粒径为15μm的轻质碳酸钙为氧化钙源，采用发泡法结合原位烧成工艺，经1 550℃保温5 h烧成后获得CA₆轻质陶瓷材料，研究不同粒度的Al₂O₃原料对其物相组成、显微结构和物理性能的影响。结果表明：随着α-Al₂O₃粒度的减小，CA₆轻质陶瓷的线收缩率、体积密度和热导率逐渐变小，显气孔率增大，压缩强度呈先增大后减小的趋势。综合考虑，以平均粒径为45μm的α-Al₂O₃为氧化铝源所制试样的综合性能较佳，更能满足使用需求，其显气孔率、热导率和压缩强度分别为87.8%、0.149 W·m^-1·K^-1和0.29 MPa。更多还原

【Abstract】 In order to study the effects of Al₂O₃ particle sizes on microstructure and properties of CA₆ lightweight ceramic materials, lightweight calcium carbonate with an average particle size of 15 μm and α-Al₂O₃ with average particle sizes of 80, 61, 45 and 38 μm were used as calcium oxide and alumina sources, respectively. CA₆ lightweight ceramic materials were prepared by foaming method combined with in-situ sintering technology after being heated at 1 550 ℃ for 5 h. Effects of Al₂O₃ starting materials with different particle sizes on their physical properties, phase composition and microstructure were investigated. The results show that with the decrease of α-Al₂O₃ particle size, the linear shrinkage, bulk density and thermal conductivity of CA₆ lightweight ceramic materials gradually decreases, while their apparent porosity gradually increases and their compressive strength increases firstly and then decreases. Comprehensively considered, the specimen prepared by α-Al₂O₃ with an average particle size of 45 μm as alumina source has better comprehensive performance, and its apparent porosity, thermal conductivity and compressive strength are 87.8%, 0.149 W·m^-1·K^-1 and 0.29 MPa, respectively, which can better meet the needs of application.更多还原