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首页> 外文期刊>Journal of Microscopy >SiCf-SiBC composites: microstructural investigations of the as-received material and creep tested composites under an oxidative environment
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SiCf-SiBC composites: microstructural investigations of the as-received material and creep tested composites under an oxidative environment

机译：SiCf-SiBC复合材料：氧化环境下原样材料和蠕变测试复合材料的微观结构研究

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SiCf -SiBC composites fabricated by Snecma Propulsion Solide (St Medard en Jalles, France) were investigated by SEM and HRTEM in the as-received state and after creep tests performed in air, in a temperature range 1423-1573 K, under 170 and 200 MPa. These composites are reinforced by Hi-Nicalon fibres (Nippon Carbon). A pyrocarbon interphase was first deposited on the fibres. The matrix was then deposited on the fibrous preform by several chemical vapour infiltrations (CVI). As a result the matrix is multilayered and based on the Si-B-C ternary system. This matrix is self-sealing: this is due to the presence of boron inducing the formation of a sealant glass if the material is heated in an oxidative environment. This glass will protect fibres and fibre/matrix interphases against oxidation. Hi-Nicalon fibres as well as the different matrix layers were studied by HRTEM and EDX. Some investigations were carried out on the creep-tested specimens in order to characterize modifications observed in the different constituents of the composites, particularly at the interfaces between the matrix layers and at the fibre/matrix interface. It was shown that several matrix layers crystallized during the creep tests. Moreover, a thin silica layer was observed at the pyrocarbon/matrix interfaces. Differences between the behaviour of the same type of material creep tested under neutral atmosphere are discussed. [References: 21]
机译：在1423-1573 K的温度范围内，在170至200的温度范围内，在1423-1573 K的空气中进行了蠕变试验后，通过SEM和HRTEM研究了由Snecma Propulsion Solide（法国圣梅德德·耶勒斯）制造的SiCf -SiBC复合材料。 MPa。这些复合材料由Hi-Nicalon纤维（日本碳纤维）增强。首先将热碳中间相沉积在纤维上。然后通过几次化学气相渗透（CVI）将基质沉积在纤维预成型件上。结果，该基质是多层的，并基于Si-B-C三元体系。该基质是自密封的：这是由于如果在氧化环境中加热材料，则硼的存在会导致密封玻璃的形成。这种玻璃将保护纤维和纤维/基质中间相免受氧化。通过HRTEM和EDX研究了Hi-Nicalon纤维以及不同的基质层。对蠕变测试的样品进行了一些研究，以表征在复合材料不同成分中观察到的改性，特别是在基质层之间的界面以及纤维/基质界面处。结果表明，在蠕变测试过程中，几层基质层结晶。此外，在热碳/基质界面观察到薄的二氧化硅层。讨论了在中性气氛下测试相同类型材料的蠕变行为之间的差异。 [参考：21]

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