SiC浆料的流变性能及多孔陶瓷的直写成型  

Rheological properties of SiC slurry and direct-ink writing of porous ceramic

作　　者：王小锋[1,2] 刘子瑞 周红莉 彭翔 王日初 曾婧[3] WANG Xiaofeng;LIU Zirui;ZHOU Hongli;PENG Xiang;WANG Richu;ZENG Jing(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Metallurgy and Environment,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中南大学冶金与环境学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第6期580-586,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省自然科学基金资助项目(2022JJ40591);长沙市自然科学基金资助项目(kq2202094)。

摘　　要：为了实现多孔SiC陶瓷孔隙结构和尺寸的精确控制和自由设计,基于SiC多孔陶瓷的直写成型,研究分散剂种类与含量、pH值、固相体积分数和增稠剂对SiC浆料流变性能的影响,进而采用优化后的浆料制备孔隙结构及尺寸可控的三维多孔结构SiC陶瓷。结果表明:浆料黏度随分散剂四甲基氢氧化铵(tetramethylammonium hydroxide,TMAH)含量的增加先减小后增大;调节浆料pH值至大于10,有利于降低浆料黏度;浆料黏度随固相体积分数的增大先增大后减小,最大固相体积分数为60%;随增稠剂甲基纤维素(methyl cellulose,MC)添加量的增加,浆料的屈服应力不断增大。优化后的SiC浆料,TMAH质量分数为0.4%,pH值>10,固相体积分数为60%,MC质量分数为0.06%。采用该浆料直写成型的SiC多孔陶瓷具有结构完整性高和干燥收缩率低的优点。In order to achieve precise control and free design of pore structure and size in porous SiC ceramics,based on the direct-ink writing of SiC porous ceramics,the effects of dispersant type and content,pH value,solid phase volume fraction,and thickener on the rheological properties of SiC slurry were studied,and then 3D porous structured SiC ceramics with controllable pore structure and size were prepared using the optimized slurry.The results indicate that the viscosity of slurry decreases first and then increases with the increment of the content of dispersant tetramethylammonium hydroxide(TMAH);pH value greater than 10 is conducive to reducing the viscosity of the slurry;the viscosity of slurry increases first and then decreases with the increment of solid phase volume fraction,having a maximum achievable solid volume fraction of 60%;the yield stress of the slurry continuously increases with increasing the addition of methyl cellulose(MC)as thickener.Optimized SiC slurry is obtained with TMAH mass fraction of 0.4%,pH value>10,solid phase volume fraction of 60%,and MC mass fraction of 0.06%.The SiC porous ceramics produced by using the slurry and direct-ink writing exhibit the advantages of high structural integrity and low drying shrinkage rate.

关 键 词：SIC 多孔陶瓷 直写成型 流变性能 固相体积分数 

分 类 号：TQ174.62[化学工程—陶瓷工业]