熔融渗硅对石墨材料微观结构及性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 231-240.

所属专题：陶瓷

熔融渗硅对石墨材料微观结构及性能的影响

杨金华¹, 艾莹珺¹, 陈子木², 刘虎^1,3, 齐哲¹, 吕晓旭¹, 焦健¹

1.中国航发北京航空材料研究院先进复合材料国防科技重点实验室,北京 100095;
2.中国航发北京航空材料研究院航空材料检测与评价北京市重点实验室,北京 100095;
3.中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京 100095

收稿日期:2020-08-20 修回日期:2020-09-27 出版日期:2021-01-15 发布日期:2021-02-07
通讯作者: 焦健,博士,研究员。E-mail:jian.jiao@biam.ac.cn
作者简介:杨金华(1985—),男,博士,高工。主要从事陶瓷及陶瓷基复合材料方面的研究。E-mail:yangjinhua08@163.com
基金资助:
国家重大科技专项(2017-VI-0007-0077)

Influence of Silicon Infiltration on Microstructure and Property of Graphite

YANG Jinhua¹, AI Yingjun¹, CHEN Zimu², LIU Hu^1,3, QI Zhe¹, LYU Xiaoxu¹, JIAO Jian¹

1. National Key Laboratory of Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;
2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;
3. Aviation Key Laboratory of Science and Technology on Advanced Corrosion andProtection for Aviation Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China

Received:2020-08-20 Revised:2020-09-27 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 选用四种不同孔隙结构的石墨进行熔融渗硅(简称熔渗)反应,采用扫描电镜、X-射线衍射、压汞、CT等方法表征了熔渗前后材料的微观形貌、物相及孔隙结构。结果表明,熔渗后的材料由石墨、硅及碳化硅三种物相组成,且硅及碳化硅的分布与石墨孔隙结构相关。熔渗后样品孔隙率均<1%,体积密度提高21.08%~35.94%。熔渗后材料强度及模量均有明显提高,强度是原石墨样品的1.7~6.2倍,模量是原石墨样品的2.4~7倍,提高幅度与石墨孔隙结构及晶粒尺寸相关。理论计算结果表明,石墨样品熔渗过程主要受扩散-反应控制。

关键词: 石墨, 陶瓷基复合材料, 碳化硅, 熔融渗硅, 微观结构

Abstract: Four kinds of graphite with different pore structure were selected for silicon infiltration (referred as infiltration) reaction.SEM,XRD,mercury intrusion porosimetry and CT methods were adopted to characterize the microstructure,phases and pore structure changes before and after the infiltration.The results show that the infiltrated samples are consisted of the graphite,silicon and silicon carbide,and the distribution of the silicon and silicon carbide is depended on the pore structure of the graphite.The porosities of all the infiltrated samples are lower than 1%,and the increase of the bulk density ranges from 21.08% to 35.94%.The strength of the infiltrated samples is 1.7 times to 6.2 times higher and the modulus is 2.7 times to 7 times higher than the graphite samples,and the increase of the strength is depended on the pore structure and crystal sizes of the graphite.Calculation results show that the infiltration process is controlled by the diffusion-reaction process.

Key words: graphite, ceramic matrix composite, silicon carbide, silicon infiltration, microstructure

中图分类号:

TQ174.7

杨金华, 艾莹珺, 陈子木, 刘虎, 齐哲, 吕晓旭, 焦健. 熔融渗硅对石墨材料微观结构及性能的影响[J]. 硅酸盐通报, 2021, 40(1): 231-240.

YANG Jinhua, AI Yingjun, CHEN Zimu, LIU Hu, QI Zhe, LYU Xiaoxu, JIAO Jian. Influence of Silicon Infiltration on Microstructure and Property of Graphite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 231-240.

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熔融渗硅对石墨材料微观结构及性能的影响

Influence of Silicon Infiltration on Microstructure and Property of Graphite

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