CIESC Journal ›› 2021, Vol. 72 ›› Issue (4): 2293-2299.DOI: 10.11949/0438-1157.20201197

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

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

ZHOU Jian(),JIANG Qian,YANG Yi,FENG Shasha,ZHONG Zhaoxiang(),XING Weihong()   

  1. National Engineering Research Center for Special Separation Membrane, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China
  • Received:2020-08-21 Revised:2020-11-23 Online:2021-04-05 Published:2021-04-05
  • Contact: ZHONG Zhaoxiang,XING Weihong

烧结助剂对低温制备碳化硅多孔陶瓷性能的影响

周剑(),江倩,杨怡,冯厦厦,仲兆祥(),邢卫红()   

  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
  • 通讯作者: 仲兆祥,邢卫红
  • 作者简介:周剑(1991—),男,博士研究生,zhouj107@njtech.edu.cn
  • 基金资助:
    国家自然科学基金项目(21838005);国家重点研发计划项目(2018YFE0203500)

Abstract:

In this study, silicon carbide (SiC) porous ceramic supports were prepared via dry pressing method with the sintering temperature of 1150℃. Isodium dodecyl benzene sulfonate (SDBS), sodium hydroxide (NaOH) and NaA 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 resistance were investigated. The low-temperature sintering mechanism of additives was analyzed. The research results showed that the ceramics have an enhanced gas permeance, bending strength and thermal shock resistance. Ceramics doped with NaA molecular sieve residue possesses the best gas permeance of 1300 m3/(m2·h·kPa), bending strength of 27 MPa, and good thermal shock resistance.

Key words: silicon carbide, powders, sintering, sintering additive, preparation, thermal shock resistance

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 m3/(m2·h·kPa),强度可达27 MPa,且抗热震性能良好。

关键词: 碳化硅, 粉体, 烧结, 烧结助剂, 制备, 抗热震性

CLC Number: