碳化硅陶瓷基复合材料表面环境障涂层结合强度
Bonding strength of environmental barrier coatings on surface of SiC-based ceramic matrix composites
查看参考文献24篇
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文摘
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SiC陶瓷基复合材料(SiC-based ceramic matrix composites,SiC-CMC)是发展高推重比航空发动机理想的高温结构材料。为了防止发动机服役环境下燃气(富含H_2O和O_2)对SiC-CMC的腐蚀,需要在其表面制备抗水氧腐蚀、抗燃气冲刷和抗热冲击性能优异的环境障涂层(environmental barrier coatings,EBCs)。在评价EBCs性能的诸多因素中,其与SiC-CMC基体之间的结合强度是一个重要技术指标,但结合强度的极限值一直未被探究清楚。本工作研究影响结合强度的主要因素,包含SiC-CMC基体状态、单晶Si的拉伸强度极限,以及Si黏结层的制备工艺等,获得了制备最高结合强度的有效途径。在EBCs与SiC-CMC组成的体系中,基体内部SiC纤维布之间的界面是结合强度最薄弱的部位,其次是EBCs的Si层。整个体系的结合强度极限值是15 MPa,它是单晶Si在[400]晶向的拉伸强度极限。采用大气等离子喷涂或者超音速火焰喷涂的Si黏结层结合强度相似,均低于同样工艺制备的莫来石或Yb_2Si_2O_7涂层。 |
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其他语种文摘
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SiC-based ceramic matrix composites (SiC-CMC) are an ideal material for aeroengines with high thrust/mass ratio.In order to prevent the corrosion of SiC-CMC by gas (rich in H_2O and O_2) in the engine, it is necessary to prepare environmental barrier coatings (EBCs) with excellent water and oxygen corrosion resistance, gas erosion resistance and thermal shock resistance. Among many factors that evaluate the performance of EBCs, the bonding strength between EBCs and SiC-CMC matrix is an important indicator, but the limit value of the bonding strength has not been clearly explored. In this paper, main factors to control the bonding strength were studied in order to reach the highest value, including the SiCCMC matrix state, the tensile strength limit of single crystal Si, and the preparation process of the Si bonding layer, etc. In the SiC-CMC/EBCs system, the interface between the SiC fiber cloth is the weakest part of the bonding strength, followed by the Si bonding layer. The bonding strength limit is 15 MPa, which is the tensile strength limit of single crystal Si in the [400] crystal direction. The bonding strength of the Si layer using atmospheric plasma spraying (APS) or high velocity oxygen-fuel(HVOF) is similar, which is lower than that of mullite or Yb_2Si_2O_7 layer sprayed by the same process. |
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来源
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材料工程
,2024,52(2):198-206 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000823
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关键词
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碳化硅
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复合材料
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环境障涂层
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结合强度
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地址
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1.
中国航发南方工业有限公司, 湖南, 株洲, 412002
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武汉理工大学, 硅酸盐建筑材料国家重点实验室, 武汉, 430070
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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基金
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国家自然科学基金“叶企孙”科学基金重点支持项目
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文献收藏号
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CSCD:7679712
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