摘要
本文针对以模压法制备的莫来石纤维隔热材料内部莫来石纤维易形成层状排列的缺点,通过向浆料中引入聚丙烯酰胺(CPAM)的方法来增加浆料的黏度,从而提高纤维的悬浮稳定性,进而制备出具有三维网络结构的莫来石纤维隔热材料。研究了CPAM浓度对莫来石纤维多孔隔热材料的显微结构以及各项物理性能的影响规律。试验结果表明,随着CPAM浓度的增加,试样内部纤维的三维搭接结构越发明显,试样的气孔率逐渐增大,密度和热导率随之减小。但样品的强度随着CPAM的加入呈先增大后减小趋势。当CPAM的浓度为质量分数0.62%时,所制备出的样品的密度为0.382g/cm3、热导率为0.069W/(m·K),且强度呈现最大值0.64MPa。
In this paper,in order to overcome the shortcomings that the internal mullite fibers in the mullite fiber insulation material prepared by the molding method tended to form a parallel orientation,polyacrylamide（CPAM）was introduced into the slurry to increase the viscosity of it so as to improve the suspension stability of the fibers,so the mullite fiber insulation material with three-dimensional network structure can be prepared.In this process,the influence of CPAM concentration on the microstructure and physical properties of mullite fiber insulation material was investigated.The results indicated that with the increase of CPAM concentration,the three-dimensional structure of the internal fibers became more and more obvious,the porosity of the sample increased and the density and the thermal conductivity decreased,while the strength of the sample first increased and then decreased.The maximum strength of the sample reached 0.64MPa when the concentration of CPAM was 0.62 wt.%,by which the density and the thermal conductivity of the prepared sample was 0.382g/cm^3 and 0.069 W/（m· K）respectively.
作者
任海涛
贾韬
刘家臣
郭安然
Ren Haitao;Jia Tao;Liu Jiachen;Guo Anran(School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China)
出处
《航空科学技术》
2018年第4期73-78,共6页
Aeronautical Science & Technology
基金
航空科学基金(2016ZF48006)~~
关键词
莫来石纤维
多孔陶瓷
微观结构
压缩回弹性能
mullite fiber
porous ceramics
microstructure
compressibility and resilience performance
