烧结助剂对低温制备碳化硅多孔陶瓷性能的影响

doi:10.11949/0438-1157.20201197

摘要/Abstract

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

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

中图分类号:

TQ 174

周剑, 江倩, 杨怡, 冯厦厦, 仲兆祥, 邢卫红. 烧结助剂对低温制备碳化硅多孔陶瓷性能的影响[J]. 化工学报, 2021, 72(4): 2293-2299.

ZHOU Jian, JIANG Qian, YANG Yi, FENG Shasha, ZHONG Zhaoxiang, XING Weihong. Effect of sintering additives on properties of silicon carbide porous ceramics prepared at low temperature[J]. CIESC Journal, 2021, 72(4): 2293-2299.

图/表 10

图1 NaA分子筛残渣XRD图

Fig.1 XRD pattern of NaA zeolite residue

图2 烧结助剂对支撑体微观结构的影响

Fig.2 Effects of sintering additives on the microstructure of the supports

图3 烧结助剂种类以及含量对支撑体强度的影响

Fig.3 Effects of kind and content of sintering additives on the bending strength of the supports

图4 烧结助剂种类以及含量对支撑体孔隙率的影响

Fig.4 Effects of kind and content of sintering additives on the porosity of the supports

图5 烧结助剂种类以及含量对支撑体平均孔径的影响

Fig.5 Effects of kind and content of sintering additives on the average pore size of the supports

图6 烧结助剂种类以及含量对支撑体气体渗透性的影响

Fig.6 Effects of kind and content of sintering additives on the gas permeance of the supports

图7 支撑体强度随冷热循环的变化

Fig.7 Change of the bending strength of the supports after hot-cold cycle

图8 支撑体XRD谱图

Fig.8 XRD patterns of supports

图9 添加烧结助剂反应烧结过程

Fig.9 Reaction during the sintering process with addition of sintering additives

图10 烧结助剂NaA制备的SiC支撑体EDS mapping

Fig.10 EDS mapping of SiC support prepared by NaA sintering aid

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