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首页> 外文期刊>Metallurgical and materials transactions. A, physical metallurgy and materials science >Interface Characterization of Ceramic Fiber-Reinforced Ti Alloy Composites Manufactured by Infrared Processing
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Interface Characterization of Ceramic Fiber-Reinforced Ti Alloy Composites Manufactured by Infrared Processing

机译：红外处理制备的陶瓷纤维增强钛合金复合材料的界面表征

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摘要

Interfacial reactions between several ceramic fibers (SCS-0, SCS-6, and carbon fibers) and a liquid titanium-nickel-copper alloy were investigated using electron microscopic analysis. Composite specimens were produced using a rapid infrared manufacturing (RIM) process. In SCS-0/Ti alloy composites, SiC dissolved in the alloy. The main reaction product was discontinuous agglomerates of titanium carbide which formed from the reaction between dissolved carbon and titanium. Polygonal precipitates of Ti_5Si_3, which are believed to have formed during cooling, were also noticed. Two distinct interface morphologies were observed in these composites: uniform fronts caused by iso-thermal dissolution and scalloped fronts formed as a result of an accelerated dissolution mechanism caused by localized heating. The presence of the accelerated dissolution mechanism suggests that SiC fibers cannot be infiltrated with liquid titanium alloys without applying a coating. In the C/Ti system, carbon fibers reacted with the liquid alloy to form a continuous layer of Ti_xC_(1-x). Further growth of this layer occurred by the diffusion of carbon atoms across the reaction product. In SCS-6/Ti alloy composites, free carbon present in the coating formed a discontinuous layer of Ti_xC_(1-x), whereas SiC particles dissolved in the alloy. Due to channeled dissolution in the coating, the accel- erated dissolution mechanism was not observed in these composites. As a result, the presence of the carbon-rich coating prevented degradation of the fibers. Although the coating present on SCS-6 fibers moderately retarded reactions in the SiC/Ti alloy composite system during infrared liquid infiltration, it is recommended that the fibers be coated with pure carbon to effectively limit the attack of the fiber by molten titanium.
机译：使用电子显微镜分析研究了几种陶瓷纤维（SCS-0，SCS-6和碳纤维）与液态钛-镍-铜合金之间的界面反应。复合样品是使用快速红外制造（RIM）工艺生产的。在SCS-0 / Ti合金复合材料中，SiC溶解在合金中。主要反应产物是由溶解的碳与钛之间的反应形成的碳化钛的不连续附聚物。还注意到据认为在冷却期间形成的Ti_5Si_3的多边形沉淀。在这些复合材料中观察到两种截然不同的界面形态：由等温溶解引起的均匀锋面和由于局部加热引起的加速溶解机制而形成的扇形锋面。加速溶解机制的存在表明，如果不施加涂层，SiC纤维就不会被液态钛合金渗透。在C / Ti系统中，碳纤维与液态合金反应形成Ti_xC_（1-x）连续层。该层的进一步生长是通过碳原子在整个反应产物中的扩散而发生的。在SCS-6 / Ti合金复合材料中，涂层中存在的自由碳形成Ti_xC_（1-x）的不连续层，而SiC颗粒溶解在合金中。由于涂料中的通道性溶解，在这些复合材料中未观察到加速的溶解机理。结果，富碳涂层的存在防止了纤维的降解。尽管在红外液体渗透过程中，SCS-6纤维上存在的涂层可适度延迟SiC / Ti合金复合系统中的反应，但建议为纤维涂覆纯碳，以有效地限制熔融钛对纤维的侵蚀。

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