界面相对3D-SiC/SiC复合材料静态力学性能及内耗特征的影响

doi:10.15541/jim20200272

无机材料学报 ›› 2021, Vol. 36 ›› Issue (1): 55-60.DOI: 10.15541/jim20200272

所属专题：【结构材料】陶瓷基复合材料

界面相对3D-SiC/SiC复合材料静态力学性能及内耗特征的影响

马登浩¹,侯振华²(),李军平¹,孙新¹,金恩泽¹,尹健³

^1. 航天材料及工艺研究所先进功能复合材料技术重点实验室, 北京 100076
^2. 江西嘉捷信达新材料科技有限公司, 南昌 330096
^3. 中南大学粉末冶金国家重点实验室, 长沙 410083

收稿日期:2020-05-18 修回日期:2020-07-14 出版日期:2021-01-20 网络出版日期:2020-07-21
作者简介:马登浩(1987-), 男, 工程师. E-mail: madenghao1987@163.com
基金资助:
国家自然科学基金(U19A2099);装备预研项目(6142906190101);航天创新基金(CALT201707)

Interface Type on the Static Mechanical Properties and Internal Friction of 3D-SiC/SiC Composites

MA Denghao¹,HOU Zhenhua²(),LI Junping¹,SUN Xin¹,JIN Enze¹,YIN Jian³

^1. Science and Technology of Advanced Functional Composite Materials Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;
^2. Jiangxi Jiajie Xinda New Materials Technology Co., Ltd, Nanchang 330096, China
^3. State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China

Received:2020-05-18 Revised:2020-07-14 Published:2021-01-20 Online:2020-07-21
About author:MA Denghao(1987-), male, engineer. E-mail: madenghao1987@163.com
Supported by:
National Natural Science Foundation of China(U19A2099);Equipment Research Foundation(6142906190101);Aerospace Innovation Fund(CALT201707)

摘要/Abstract

摘要：

采用先驱体浸渍裂解工艺制备无界面、SiC、PyC和PyC/SiC等界面相SiC/SiC复合材料, 研究了SiC/SiC复合材料的微观结构及静态力学性能, 并通过强迫振动法系统分析了界面相对复合材料内耗行为的影响。研究结果表明, 引入界面相有效改善了复合材料的微观结构及力学性能, 并降低了复合材料的内耗。其中, PyC/SiC复相界面中亚层SiC限制了PyC界面相与纤维的结合及塑性形变, 提高了复合材料的力学性能; 同时, 界面相对SiC/SiC复合材料内耗行为有显著影响, 材料内耗水平与界面剪切强度成反比。对比50和350 ℃时的材料内耗变化率发现, 随界面剪切强度增大, 材料内耗呈降低的趋势, 且含有PyC的PyC/SiC界面复合材料具有较低的内耗变化率, 说明PyC/SiC复相界面的SiC/SiC复合材料更适于高温振动环境。

关键词: SiC/SiC复合材料, 界面相, 内耗, 力学性能

Abstract:

Microstructure and static mechanical properties of 3D-SiC/SiC composites with different interfaces, such as PyC, SiC and PyC/SiC and without an interface were prepared via polymer infiltration and pyrolysis, and effect of interface type on the internal friction was investigted by means of forced vibration. The results showed that the microstructure and static mechanical properties of SiC/SiC composites with an interphase layer were superior to the composites without an interlayer, and the former also showed a lower internal friction than the later. The sub-layer SiC of the PyC/SiC interface limits the binding state and the plastic deformation of PyC interphase, beneficial to improving the mechanical properties of SiC/SiC composite. Meanwhile, The interface layer of SiC/SiC composites has a significant effect on the internal friction behavior, with interfacial shear strength inversely proportional to the internal friction. By comparing the change rate of internal friction of composites at 50 and 350 ℃, the overall trend of internal friction decreases with the increase of interfacial shear strength. In addition, as compared with the composite with PyC interface, the composite with PyC/SiC interface has a lower change rate of the internal fiction, indicating that PyC/SiC interface of SiC/SiC composites is more helpful for high temperature vibration environment.

Key words: SiC/SiC compsite, interphase, internal friction, mechanical property

中图分类号:

TB332

马登浩, 侯振华, 李军平, 孙新, 金恩泽, 尹健. 界面相对3D-SiC/SiC复合材料静态力学性能及内耗特征的影响[J]. 无机材料学报, 2021, 36(1): 55-60.

MA Denghao, HOU Zhenhua, LI Junping, SUN Xin, JIN Enze, YIN Jian. Interface Type on the Static Mechanical Properties and Internal Friction of 3D-SiC/SiC Composites[J]. Journal of Inorganic Materials, 2021, 36(1): 55-60.

图/表 8

图1 不同界面相3D SiCf/SiC复合材料制备流程图

Fig. 1 Preparation process of the 3D SiCf/SiC composites with various interphase

图2 不同界面层复合材料截面的SEM照片

Fig. 2 Cross-sectional SEM images of the composites with different interface layers (a) S1; (b) S2; (c) S3; (d) S4

图3 不同界面层SiC/SiC复合材料的界面剪切强度、断裂韧性和弯曲强度

Fig. 3 Interface shear strength and fracture toughness, flexural strength of the composites with different interface layers

图4 不同界面SiC/SiC复合材料内耗与温度的关系

Fig. 4 Temperature dependence of internal friction in SiC/SiC composite with different interface layers

图5 不同界面SiC/SiC复合材料内耗与频率的关系

Fig. 5 Internal friction of SiC/SiC composites with different interface layers as a function of frequency

图6 不同界面SiC/SiC复合材料内耗与应变振幅的关系

Fig. 6 Internal friction vs strain amplitude in SiC/SiC composites with different interface layers

图7 不同界面SiC/SiC复合材料的剪切强度与内耗的关系

Fig. 7 Internal friction at 50 ℃ and 325 ℃ as a function of interface shear strength

图8 不同界面剪切强度与内耗变化率的关系

Fig. 8 Change rate of internal friction at 50℃ and 325℃ as a function of interface shear strength

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界面相对3D-SiC/SiC复合材料静态力学性能及内耗特征的影响

Interface Type on the Static Mechanical Properties and Internal Friction of 3D-SiC/SiC Composites

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