SiCf/SiC复合材料的RMI制备方法以及微观结构和性能优化

doi:10.15541/jim20210091

无机材料学报 ›› 2021, Vol. 36 ›› Issue (10): 1103-1110.DOI: 10.15541/jim20210091 CSTR: 32189.14.10.15541/jim20210091

SiC_f/SiC复合材料的RMI制备方法以及微观结构和性能优化

张俊敏¹^,²^,³(), 陈小武¹^,²(), 廖春景¹^,², 郭斐宇¹^,²^,³, 杨金山¹^,², 张翔宇¹^,², 董绍明¹^,²()

1.中国科学院上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050
2.中国科学院上海硅酸盐研究所, 结构陶瓷及复合材料工程研究中心, 上海 200050
3.上海科技大学物理科学与技术学院, 上海 200031

收稿日期:2021-02-09 修回日期:2021-03-24 出版日期:2021-10-20 网络出版日期:2021-04-05
通讯作者: 陈小武, 助理研究员. E-mail: xwchen@mail.sic.ac.cn; 董绍明, 研究员. E-mail: smdong@mail.sic.ac.cn
作者简介:张俊敏(1996–), 男, 博士研究生. E-mail: zhangjm2@shanghaitech.edu.cn

Optimizing Microstructure and Properties of SiC_f/SiC Composites Prepared by Reactive Melt Infiltration

ZHANG Junmin¹^,²^,³(), CHEN Xiaowu¹^,²(), LIAO Chunjin¹^,², GUO Feiyu¹^,²^,³, YANG Jinshan¹^,², ZHANG Xiangyu¹^,², DONG Shaoming¹^,²()

1. State Key Laboratory of High Performance Ceramics and Superﬁne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
3. School of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China

Received:2021-02-09 Revised:2021-03-24 Published:2021-10-20 Online:2021-04-05
Contact: CHEN Xiaowu, lecturer. E-mail: xwchen@mail.sic.ac.cn; DONG Shaoming, professor. E-mail: smdong@mail.sic.ac.cn
About author:ZHANG Junmin(1996–), male, PhD candidate. E-mail: zhangjm2@shanghaitech.edu.cn
Supported by:
National Natural Science Foundation of China(51902328);Science and Technology Commission of Shanghai Muni¬cipality(19ZR1464700);Innovation Academy for Light-duty Gas Turbine, CAS(CXYJJ20-QN-09);Chinese Academy of Sciences(QYZDY-SSW-JSC031);Key Deployment Project of the Chinese Academy of Sciences(ZDRW-CN-2019-01)

摘要/Abstract

摘要：

反应熔体渗透(RMI)是制备高密度陶瓷基复合材料的有效方法之一, 而熔体的渗透和复合材料的形成主要取决于预制体的孔隙结构。本研究将硅熔体渗透到具有不同孔隙结构的含碳预制体中, 制备了SiC纤维增强SiC基复合材料(SiC_f/SiC), 并研究了孔隙结构对熔体浸润和SiC_f/SiC复合材料的影响。研究结果表明: 具有较均匀孔径的预制体可以使熔体浸润更充分, 制备的复合材料具有更少的残余孔隙及更优的力学性能。该研究对反应熔渗制备复合材料的孔结构调控具有指导意义。

关键词: SiC_f/SiC复合材料, 反应熔渗(RMI), 孔隙结构, 微观结构, 熔渗动力学

Abstract:

Reactive melt infiltration (RMI) is one of the most effective methods to prepare highly dense ceramic matrix composites. The melt infiltration and the formation of composites are mainly determined by the pore structure of preforms. Here, SiC fiber reinforced SiC matrix composites (SiC_f/SiC) were prepared by infiltrating Si melt into carbon-contained preforms with various pore structures. Effects of pore structure on the melt infiltration and received SiC_f/SiC composites were investigated. The results indicated that the preforms with more homogeneous pore size could lead to more sufficient melt infiltration, and also resulted in fewer residual pores and better mechanical properties in the composites. This study is expected to provide important guidance for the pore structure regulation in the fabrication of RMI-composites.

Key words: SiC_f/SiC composites, reactive melt infiltration (RMI), pore structure, microstructure, infiltration kinetics

中图分类号:

TQ174

张俊敏, 陈小武, 廖春景, 郭斐宇, 杨金山, 张翔宇, 董绍明. SiC_f/SiC复合材料的RMI制备方法以及微观结构和性能优化[J]. 无机材料学报, 2021, 36(10): 1103-1110.

ZHANG Junmin, CHEN Xiaowu, LIAO Chunjin, GUO Feiyu, YANG Jinshan, ZHANG Xiangyu, DONG Shaoming. Optimizing Microstructure and Properties of SiC_f/SiC Composites Prepared by Reactive Melt Infiltration[J]. Journal of Inorganic Materials, 2021, 36(10): 1103-1110.

图/表 10

Fig. 1 Flowchart of SiCf/SiC composites fabrication process

Table 1 Different impregnation treatments to the preforms

Preform	Preparing process	Further impregnation	Composites
Pre-1	Slurry impregnation	None	Com-1
Pre-2	Slurry impregnation	Pure PF	Com-2
Pre-3	Slurry impregnation	Polymer blend	Com-3

Fig. 2 SEM images of pyrolytic carbon prepared with different organic pore former contents ((a) Pure PF; (b) Organic pore former: PF=0.1; (c) Organic pore former: PF=0.2, (d) Organic pore former: PF=0.3); (e) Pore size distribution of pyrolytic carbon

Fig. 3 Cross-sectional SEM images of preforms ((a) Pre-1, (b) Pre-2, (c) Pre-3), and (d) pore size distribution of the preforms

Fig. 4 XRD patterns of SiCf/SiC composites prepared with different impregnation treatments

Fig. 5 Cross-sectional SEM images of SiCf/SiC (a) Com-1, (b) Com-2 and (c) Com-3

Fig. 6 Elemental analyses of inter/intra-bundle matrix in composites

Fig. 7 (a) Bending load-displacement curves of composites, and fractural surface SEM images of composite ((b) Com-1, (c) Com-2 and (d) Com-3)

Table 2 Comparison of the mechanical properties of the SiCf/SiC composites

Composites	Density/(g·cm^-3)	Open porosity/%	Flexural strength/MPa	Elastic modulus/GPa
Com-1	(2.41±0.08)	(10.08±0.50)	(96.04±9.50)	(42.53±0.73)
Com-2	(2.57±0.08)	(8.39±0.58)	(176.76±3.78)	(67.55±0.46)
Com-3	(2.61±0.05)	(7.92±0.61)	(200.50±7.33)	(79.19±0.65)

Fig. 8 (a) Schematic of reaction layer generated during the RMI, (b) curves of cumulative volume percentage vs pore diameter of preforms, and (c) variation of pore radius with infiltration time for preforms

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SiC_f/SiC复合材料的RMI制备方法以及微观结构和性能优化

Optimizing Microstructure and Properties of SiC_f/SiC Composites Prepared by Reactive Melt Infiltration

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SiCf/SiC复合材料的RMI制备方法以及微观结构和性能优化

Optimizing Microstructure and Properties of SiCf/SiC Composites Prepared by Reactive Melt Infiltration

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SiC_f/SiC复合材料的RMI制备方法以及微观结构和性能优化

Optimizing Microstructure and Properties of SiC_f/SiC Composites Prepared by Reactive Melt Infiltration