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以Ti粉、纯Al和碳纤维为原料,采用浸渗-反应合成法制备出Ti-Al-C系复合材料。首先将Ti粉和碳纤维制成预制件,再将熔融的纯Al压入预制件,制备出铸态的复合材料。随后将铸态的复合材料分别在600至1260℃间进行原位反应,保温时间为1h。通过SEM和EDX分析了复合材料的显微组织和产物的元素成分,同时,采用XRD分析复合材料的相组成。结果表明,在较低温下,TiAl3和Al4C3首先生成;随着温度的进一步升高,TiAl3分解,TiC析出;在高温下,氧化现象发生,有Al2O3生成。Ti-Al-C系复合材料在原位反应过程中遵循生成-分解-析出-氧化机制。
Ti-Al-C composites were prepared by impregnation-reaction synthesis using Ti powder, pure Al and carbon fiber as raw materials. First, the Ti powder and the carbon fiber are made into a preform, and then the molten pure Al is pressed into the preform to prepare the as-cast composite material. The as-cast composites were then subjected to in situ reaction at 600 to 1260 ° C for 1 h. The microstructure and the elemental composition of the composite were analyzed by SEM and EDX. Meanwhile, the phase composition of the composite was analyzed by XRD. The results show that TiAl3 and Al4C3 are firstly formed at lower temperature. TiAl3 is decomposed and TiC is precipitated with the further increase of temperature. At high temperature, oxidation occurs and Al2O3 is formed. Ti-Al-C composites follow the mechanism of formation-decomposition-precipitation-oxidation during in-situ reaction.