中航复合材料有限责任公司,北京,101300
纸质出版:2017
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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.
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。
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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