Al填料改性PIP-2D SiC<sub>f</sub>/SiC复合材料力学性能和电磁屏蔽性能

雷强; 段士昌; 豆永青; 李倩; 李候俊; 田佳豪

doi:10.11868/j.issn.1005-5053.2023.000067

Al填料改性PIP-2D SiC_f/SiC复合材料力学性能和电磁屏蔽性能

doi: 10.11868/j.issn.1005-5053.2023.000067

雷强^1, ,,
段士昌^2, ,,
豆永青²,
李倩²,
李候俊²,
田佳豪²

1.
中国航发贵州黎阳航空动力有限公司，贵阳 550014
2.
陕西华秦科技实业股份有限公司，西安 710048

详细信息

通讯作者:
雷强（1973—），男，研究员，主要从事航空发动机材料研究，联系地址：贵州省贵阳市白云区黎阳路1111号（550014），E-mail: 2861273421@qq.com

段士昌（1992—），男，博士，工程师，主要从事特种功能涂层和复合材料研究，联系地址：陕西省西安市长安区西部大道188号（710048），E-mail: csumsedsc@163.com

中图分类号: TB34
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出版历程
- 收稿日期: 2023-05-18
- 修回日期: 2023-08-08
- 网络出版日期: 2023-10-18
- 刊出日期: 2023-10-01

Mechanical and electromagnetic shielding properties of PIP-2D SiC_f/SiC composite materials modified with Al filler

1.
China Aviation Development Guizhou Liyang Aviation Power Co., Ltd., Guiyang 550014, China
2.
Shaanxi Huaqin Technology Industry Co., Ltd., Xi’an 710048, China

摘要

摘要: 以Al粉为活性填料，采用先驱体浸渍裂解法（PIP法）制备二维连续碳化硅纤维增强碳化硅复合材料（2D SiC_f/SiC复合材料），采用XRD、SEM和热失重仪分析不同Al粉含量对聚碳硅烷裂解产物的组织成分演变行为，采用力学试验机和矢量网络分析仪研究不同Al粉含量对复合材料的力学及电磁屏蔽性能影响。结果表明：随着Al填料质量分数从0%增加至40%，复合材料弯曲强度先升高后下降，最高可达383 MPa；Al填料的引入使得复合材料复介电常数逐渐升高，电磁屏蔽效能逐渐增加至26 dB，得到了显著的提升，电磁屏蔽效能大幅度提升主要原因是Al填料含量增加引起复合材料复介电常数虚部显著增加。
- 活性填料Al /
- 先驱体浸渍裂解 /
- SiC_f/SiC复合材料 /
- 电磁屏蔽性能
Abstract: A two-dimensional continuous silicon carbide fiber reinforced silicon carbide composite material（2D SiC_f/SiC composite material）was prepared by precursor impregnation cracking method（PIP method）using Al powder as the active filler. XRD, SEM and thermogravimetry were used to analyze the evolution behavior of the microstructure and composition of polycarbosilane pyrolysis products with various Al powder contents. The effects of various Al powder contents on the mechanical and electromagnetic shielding properties of the composites were studied by mechanical testing machine and vector network analyzer. The results show that as the mass fraction of Al filler increases from 0% to 40%, the bending strength of the composite material first increases and then decreases, and the maximum bending strength can reach 383 MPa. The introduction of aluminum filler leads to a gradual increase in the complex dielectric constant of the composite material, and the electromagnetic shielding efficiency gradually increases to 26 dB, which has been greatly improved. This is mainly due to the significant increase in the imaginary part of the complex dielectric constant caused by the increase in the content of Al filler, resulting in a significant improvement in the absorption and shielding efficiency of the composite material.
- active filler Al /
- precursor impregnation cracking /
- SiC_f/SiC composite material /
- electromagnetic shielding performance

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图 1 不同Al含量PCS在1000 ℃裂解2 h的XRD图谱

Figure 1. XRD patterns of polycarbosilane with Al filler of various contents pyrolyzed at 1000 ℃ for 2 h

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图 2 不同含量Al填料先驱体DSC/TG曲线　（a）TG曲线；（b）DSC曲线

Figure 2. DSC/TG curves of aluminum filler precursors with Al filler of various contents　（a）TG curves；（b）DSC curves

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图 3 不同Al含量SiC_f/SiC复合材料的弯曲强度-断裂位移曲线图

Figure 3. Flexural strength-displacement curves of SiC_f/SiC composites with Al filler of various contents

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图 4 不同Al含量SiC_f/SiC复合材料的断面微观形貌　（a）0%；（b）10%；（c）20%；（d）40%

Figure 4. Fracture morphologies of SiC_f/SiC composites with Al filler of various contents　（a）0%；（b）10%；（c）20%；（d）40%

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图 5 40%Al填料改性SiC_f/SiC复合材料截面形貌

Figure 5. Cross section morphology of SiC_f/SiC composite modified with 40% Al filler

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图 6 不同Al含量SiC_f/SiC复合材料在X波段的复介电常数

Figure 6. Complex permittivities of SiC_f/SiC composites with Al filler of various contents in X band

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图 7 不同Al含量SiC_f/SiC复合材料在X波段的电磁屏蔽性能（a）反射屏蔽效能；（b）吸收屏蔽效能；（c）总电磁屏蔽效能

Figure 7. Electromagnetic shielding performances of SiC_f/SiC composite materials with Al filler of various contents in X-band（a）reflective shielding effectiveness;（b）absorption shielding effectiveness;（c）total electromagnetic shielding effectiveness

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图 8 不同Al含量SiC_f/SiC复合材料在厚度为3.0 mm时入射阻抗

Figure 8. Input impedance of SiC_f/SiC composites（thickness is 3.0 mm）with Al filler of various contents

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表 1 不同Al含量混合前驱体溶液

Table 1. Composition of Al filler mixed precursor solution

Number	Xylene/g	PCS/g	Al/g	Mass fraction of Al/%
1	50	50	0	0
2	55.56	50	5.56	10
3	62.5	50	12.5	20
4	83.34	50	33.34	40

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表 2 不同Al含量SiC_f/SiC复合材料性能

Table 2. Properties of fabricated SiC_f/SiC composites with Al filler of various contents

Al content/%	Porosity /%	Density/ （g·cm⁻³）	PIP cycles	Flexural strength / MPa	Displacement / mm	Fracture toughness/ （MPa·m^−1/2）
0	13.4	2.21	10	304±8	0.49±0.03	18.5±0.7
10	9.1	2.35	6	383±7	0.60±0.02	18.8±1.0
20	14.1	2.17	4	291±10	0.46±0.04	17.9±1.2
40	14.7	2.15	4	257±8	0.52±0.04	18.3±1.3

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