碳纤维增强纯钛烧结过程中TiC形成的影响因素及形态特征

Influencing Factors of TiC Formation and Its Morphological Characteristics in Carbon Fiber Reinforced Titanium Sintering Process

以Ti粉和碳纤维为原料,采用氩气保护常压烧结的工艺方法,改变烧结温度等工艺参数和碳纤维的形态,获得了α-Ti与C纤维复合材料样品。利用SEM分析、微区成分分析和XRD物相分析,证明了烧结过程中Ti原子与C原子在Ti基体与碳纤维的界面反应生成了TiC,并有以碳纤维为导向形成TiC纤维的趋势。通过显微组织、显微硬度等辅助分析,考察了工艺参数对TiC形成及微观形态的影响规律。结果表明,氩气保护常压烧结时,随着烧结温度的提高,Ti基体与碳纤维的界面形成的TiC形态发生了显著变化,由致密的纤维状向具有显著颗粒构成的纤维状转化,碳纤维粉末化后加入时形成了分散的粒状TiC。

The α-Ti and C fiber composite material samples were produced through pressure-less sintering in argon atmosphere with different process parameters such as sintering temperature and carbon fiber morphology, using Ti powder and carbon fiber as raw materials. During the sintering, TiC is generated from the reactions of Ti atom and C atom between Ti and carbon fiber, and there is a trend that the TiC fiber is formed with carbon fiber as the orientation. The influence of process parameters on TiC formation and its micro-morphology was explored by additional analysis of microstructure and micro-hardness. The results show that with the increase of sintering temperature, the morphology of TiC, formed at the interface of Ti matrix and carbon fiber, changes dramatically from a dense fibrous shape to the fibrous shape composed of remarkable transformation particles during the sintering. However, dispersible granular TiC is produced by the addition of carbon fiber powder.