烧结助剂对低温制备碳化硅多孔陶瓷性能的影响  

Effect of sintering additives on properties of silicon carbide porous ceramics prepared at low temperature

作　　者：周剑 江倩 杨怡 冯厦厦 仲兆祥 邢卫红 ZHOU Jian;JIANG Qian;YANG Yi;FENG Shasha;ZHONG Zhaoxiang;XING Weihong(National Engineering Research Center for Special Separation Membrane,College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,Jiangsu,China)

机构地区：[1]南京工业大学化工学院,国家特种分离膜工程技术研究中心,江苏南京210009

出　　处：《化工学报》2021年第4期2293-2299,共7页CIESC Journal

基　　金：国家自然科学基金项目(21838005,21878148);国家重点研发计划项目(2018YFE0203500)。

摘　　要：分别采用十二烷基苯磺酸钠、氢氧化钠以及NaA分子筛残渣为烧结助剂,碳粉为造孔剂,干压法成型,在1150℃空气气氛下烧结制备碳化硅多孔陶瓷支撑体。考察了助剂添加量对微结构、平均孔径、孔隙率以及抗热震性等方面的影响;分析了添加助剂的低温烧成机理。研究结果表明:三种添加剂均有助于提高支撑体的气体渗透性、抗弯强度和耐热震性;添加NaA分子筛残渣助烧结剂获得的碳化硅多孔陶瓷各项性能最佳,气体渗透率为1300 m^(3)/(m^(2)·h·kPa),强度可达27 MPa,且抗热震性能良好。In this study,silicon carbide(Si C)porous ceramic supports were prepared via dry pressing method withthe sintering temperature of 1150℃.Isodium dodecyl benzene sulfonate(SDBS),sodium hydroxide(Na OH)andNa A molecular sieve residue were used as sintering additives,carbon powder was employed as pore forming agent,respectively.The effects of additives on microstructure,average pore size,porosity and thermal shock resistancewere investigated.The low-temperature sintering mechanism of additives was analyzed.The research resultsshowed that the ceramics have an enhanced gas permeance,bending strength and thermal shock resistance.Ceramics doped with Na A molecular sieve residue possesses the best gas permeance of 1300 m^(3)/(m^(2)·h·k Pa),bending strength of 27 MPa,and good thermal shock resistance.

关 键 词：碳化硅 粉体 烧结 烧结助剂 制备 抗热震性 

分 类 号：TQ174[化学工程—陶瓷工业]