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首页> 外文期刊>Journal of Materials Research >Microstructure of Ti5Si3-TiC-Ti3SiC2 and Ti5Si3-TiC nanocomposites in situ synthesized by spark plasma sintering
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Microstructure of Ti5Si3-TiC-Ti3SiC2 and Ti5Si3-TiC nanocomposites in situ synthesized by spark plasma sintering

机译：火花等离子体烧结原位合成Ti5Si3-TiC-Ti3SiC2和Ti5Si3-TiC纳米复合材料的微观结构

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摘要

Nanostructured Ti5Si3-TiC-Ti3SiC2 and Ti5Si3-TiC composites were in situ fabricated through the spark plasma sintering (SPS) technique using Ti and SiC powders as reactants. It was found that the composites could be prepared in a relatively short time (6 min at 1260 degreesC) above 98% theoretical density. The phase constituents and microstructures of the samples were analyzed by x-ray diffraction and observed by scanning electron microscopy. Transmission electron microscopy was used for detailed microstructural analysis. The results showed that the reaction products mainly consisted of Ti5Si3 and TiC phases or Ti5Si3, TiC and Ti3SiC2 phases, depending on the molar ratio of reactants (Ti to SiC). The composites exhibited fine microstructure; TiC grain size was less than 200 nm. Fracture toughness at room temperature was also measured by indentation tests.
机译：以钛和碳化硅粉为反应物，通过火花等离子体烧结（SPS）技术原位制备了纳米结构的Ti5Si3-TiC-Ti3SiC2和Ti5Si3-TiC复合材料。发现可以在高于98％理论密度的相对较短的时间内（在1260℃下6分钟）制备复合材料。通过X射线衍射分析样品的相组成和微观结构，并通过扫描电子显微镜观察。透射电子显微镜用于详细的微观结构分析。结果表明，取决于反应物（Ti与SiC）的摩尔比，反应产物主要由Ti5Si3和TiC相或Ti5Si3，TiC和Ti3SiC2相组成。复合材料表现出良好的微观结构。 TiC晶粒尺寸小于200nm。还通过压痕测试测量了室温下的断裂韧性。

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