【摘要】 为了实现大掺量粉煤灰在低成本、高性能发泡陶瓷的广泛应用，以粉煤灰、滑石、长石和碳化硅为原料，加入不同量的(加入质量分数分别为0、2%、5%和7%)氟锆酸钾，通过高温煅烧制备了发泡陶瓷试样，研究了氟锆酸钾加入量对试样物相组成、显微结构及性能的影响。结果表明，随着氟锆酸钾加入量(w)由2%增加至7%,试样中锆英石和尖晶石的特征峰逐渐增强，而莫来石的特征峰则逐渐变弱，体积密度和抗压强度逐渐减小，热导率则呈现先减小后增加的趋势。同时，氟锆酸钾的加入提高了试样的孔径尺寸和均匀性及圆整度。然而，当氟锆酸钾的加入量达到7%(w)后，试样的孔径尺寸进一步增大，圆度却降低，孔结构劣化。但相比于未添加氟锆酸钾的试样，含氟锆酸钾的试样的抗压强度均显著增强，体积密度和热导率明显降低。当氟锆酸钾加入量为5%(w)时，试样的综合性能最优。更多还原

【Abstract】 In order to achieve the widespread application of high additions of fly ash in low-cost and high-performance foamed ceramics, foamed ceramics were prepared by high temperature calcination, using fly ash, talcum, feldspar and silicon carbide as raw materials, and adding different additions（0,2%,5%,and 7%,by mass） of potassium fluorozirconate（K₂ZrF₆）.The effect of the K₂ZrF₆ addition on the phase composition, microstructure and properties of the foamed ceramics was studied.The results show that: with the addition of K₂ZrF₆ increasing from 2% to 7%,the characteristic peaks of zircon and spinel gradually increase, while those of mullite gradually weaken.Meantime, the bulk density and compressive strength decrease, the thermal conductivity shows a trend of first decreasing and then increasing.At the same time, the addition of K₂ZrF₆ improves the pore size, uniformity and roundness.However, when the addition of K₂ZrF₆ reaches 7%,the pore size further increases, the roundness decreases and the pore structure deteriorates.In general, compared with the sample without K₂ZrF₆,the compressive strength of the samples containing K₂ZrF₆ significantly increases, and the bulk density as well as thermal conductivity obviously reduces.When the addition of K₂ZrF₆ is 5%,the sample has the best comprehensive performance.更多还原