Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites

张冰玉; 王　岭; 焦　健; 杨金华; 刘善华

doi:10.16080/j.issn1671-833x.2017.12.078

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Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites

更新时间：2026-04-17

- Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites
- Aeronautical Manufacturing Technology Vol. 60, Issue 12, Pages: 78-83(2017)
- 作者机构：
  
  中航复合材料有限责任公司,北京,101300
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2017.12.078
  CLC：
- Published：2017
- 稿件说明：
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张冰玉，王　岭，焦　健，杨金华，刘善华. 界面层对SiCf/SiC 复合材料力学性能及氧化行为的影响[J]. 航空制造技术, 2017, 60(12): 78-83.

（中航复合材料有限责任公司，北京 101300）. Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites. Aeronautical Manufacturing Technology, 2017, 60(12): 78-83.
张冰玉，王　岭，焦　健，杨金华，刘善华. 界面层对SiCf/SiC 复合材料力学性能及氧化行为的影响[J]. 航空制造技术, 2017, 60(12): 78-83. DOI： 10.16080/j.issn1671-833x.2017.12.078.

（中航复合材料有限责任公司，北京 101300）. Effect of Interface on Mechanical Property and Oxidation Behavior of SiCf /SiC Composites. Aeronautical Manufacturing Technology, 2017, 60(12): 78-83. DOI： 10.16080/j.issn1671-833x.2017.12.078.

摘要

为研究界面层对SiCf /SiC 复合材料力学性能及氧化行为的影响，采用先驱体浸渍裂解工艺制备了3 种不同界面层体系的SiCf /SiC 复合材料。3 种界面层分别为热解碳（PyC）、PyC+BN-Ⅰ和PyC+BN-Ⅱ（其中BN-Ⅰ表示B 质量分数大约2%，BN-Ⅱ表示B 质量分数大约20%）。研究表明，具有PyC 界面层的SiCf /SiC 复合材料常温力学性能最高，其常温弯曲强度达到380MPa，而双界面层体系中，SiCf /SiC 复合材料常温弯曲强度分别为282MPa （PyC+BN-Ⅰ）和259MPa（PyC+BN-Ⅱ）。1200℃氧化试验表明，具有PyC+BN-Ⅱ界面层的SiCf /SiC 复合材料弯曲强度保留率最高，为54%。3 种不同界面层体系的SiCf /SiC 复合材料在氧化后均表现为脆性断裂。微观结构显示，界面和纤维被氧化是导致材料最终失效的原因；能谱分析表明，具有PyC+BN-Ⅰ和PyC+BN-Ⅱ界面层的SiCf /SiC 复合材料纤维内部未检测到O 原子存在，证实BN 有保护纤维的作用。

Abstract

In order to investigate the influence of interfaces on the mechanical properties and oxidation behaviors of SiCf /SiC composites

SiCf /SiC composites with 3 different interfaces (PyC

PyC+BN-Ⅰ and PyC+BN-Ⅱ ) were prepared via precursor infiltration and pyrolysis (PIP) method. Results showed that SiCf /SiC composites with PyC interface exhibited the highest flexural strength of 380MPa. SiCf /SiC composites with PyC+BN-Ⅰ and PyC+BN-Ⅱ interfaces exhibited flexural strengths of 282MPa and 259MPa

respectively. The flexural strength retention rate of SiCf /SiC composites with PyC+BN-Ⅱ interface was 54% after heat treatment at 1200℃ in air for 2h

and all SiCf/SiC composites with different interfaces exhibited brittle fracture after heat treatment. The microstructure of SiCf /SiC composites demonstrated that the oxidation of interfaces and fibers caused the failure of the composites. Energy dispersive spectrometer had not detected oxygen on SiC fibers of SiCf /SiC composites with PyC+BN-Ⅰ and PyC+BN-Ⅱ interfaces

which indicated that BN interface can effectively protect fibers from oxidation.

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