煅烧温度对聚合物模板法制备SiC-Al_2O_3多孔陶瓷性能的影响
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摘要
为探究SiC-Al_2O_3多孔陶瓷的最佳煅烧温度,按配比(w):SiC粉66%,白刚玉粉22%,高岭土9.5%,V_2O_52%,羧甲基纤维素钠0.5%,外加磷酸三丁酯1%、聚丙烯酸钠1%和适量水制备了固相质量分数为60%的SiC-Al_2O_3料浆。采用聚合物模板法分别在1 250、1 350和1 450℃保温2 h制备了SiC-Al_2O_3多孔陶瓷,并研究了煅烧温度对陶瓷性能和物相组成的影响。结果表明:提高煅烧温度,可明显促进更多的SiC氧化生成SiO_2,进一步促进Al_6Si_2O_(13)陶瓷相的生成;同时有利于提高强度,但会降低其抗热震性。综合而言,1 350和1 450℃保温2 h制备的多孔陶瓷性能较优。
In order to research the optimal calcining temperature of SiC-Al_2O_3 porous ceramics,SiC-Al_2O_3 slurry with solid mass fraction of 60% was prepared with 66% SiC powder,22% white corundum powder,9. 5% kaolin,2% V_2O_5,0. 5% carboxymethylcellulose sodium,extra-adding 1% tributyl phosphate and 1%sodium polyacrylate,and a certain amount of water(by mass). SiC-Al_2O_3 porous ceramics were prepared at 1 250 ℃,1 350 ℃ and 1 450 ℃ for 2 h by polymeric replication,respectively. The effect of the calcining temperature on the phase composition and properties of as-prepared porous ceramics was studied. The results show that increasing the calcining temperature can obviously promote the oxidation of SiC to form SiO_2,which further promotes the formation of Al_6Si_2O_(13) ceramic phase. In addition,the increasing calcining temperature also improves the strength but decreases the thermal shock resistance of the ceramics. To sum up,the porous ceramics calcined at 1 350 ℃ and 1 450 ℃ for 2 h,respectively exhibit optimal properties.
In order to research the optimal calcining temperature of SiC-Al_2O_3 porous ceramics,SiC-Al_2O_3 slurry with solid mass fraction of 60% was prepared with 66% SiC powder,22% white corundum powder,9. 5% kaolin,2% V_2O_5,0. 5% carboxymethylcellulose sodium,extra-adding 1% tributyl phosphate and 1%sodium polyacrylate,and a certain amount of water(by mass). SiC-Al_2O_3 porous ceramics were prepared at 1 250 ℃,1 350 ℃ and 1 450 ℃ for 2 h by polymeric replication,respectively. The effect of the calcining temperature on the phase composition and properties of as-prepared porous ceramics was studied. The results show that increasing the calcining temperature can obviously promote the oxidation of SiC to form SiO_2,which further promotes the formation of Al_6Si_2O_(13) ceramic phase. In addition,the increasing calcining temperature also improves the strength but decreases the thermal shock resistance of the ceramics. To sum up,the porous ceramics calcined at 1 350 ℃ and 1 450 ℃ for 2 h,respectively exhibit optimal properties.
引文
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