【作者】 林慧敏；

【导师】 冯可芹；

【作者基本信息】 四川大学 ， 材料加工工程， 2006， 硕士

【摘要】 随着现代工业的快速发展,对铁基复合材料的需求越来越多,其制备方法也广受关注,其中燃烧合成发展较迅速。VC是铁基复合材料理想的增强体,到目前为止对在电场作用下燃烧合成VC增强Fe基复合材料方面的研究还鲜有报道。本文采用Gleeble-1500D热模拟机进行实验,实验时先将预设升温速度、预设最高温度及保温温度等参数在热模拟机上进行设置,试验机根据这些参数通过控制试样两端的电流大小来达到控制试样升温速度的目的,最终完成体系的燃烧合成。在本实验中,电场不仅能为体系提供焦耳热,更重要的是用电场来激发并维持反应进行,而不需要外加点火源。完成燃烧合成实验后,采用日本理光D/Max-IIIA X射线衍射仪对终产物进行XRD物相分析;采用OLYMPUS CK-40M金相显微镜和JSE-5900LV扫描电子显微镜(附V4150X射线能谱仪,EDS)对反应产物进行微观组织结构和形貌观察。本文对压坯成分、原料粒度及预设升温速度三种工艺条件对Fe-V-C三元系的燃烧合成的影响进行研究,并通过金斯特林格动力学方程在理论上对固相扩散进行较深入的分析。通过对压坯成分对体系燃烧合成影响进行研究,结果表明电场不仅能激发并维持反应的进行,还能促进体系的固相扩散,降低点火温度,使体系在较低的温度下完成合成反应。将热模拟试验机采集到的温度场数据进行分析,得出体系的点火温度在560～880℃之间,属于固相反应,而且随着压坯中含V量的增加,体系点火温度降低,点火延迟时间缩短。实验后,对终试样进行了XRD更多还原

【Abstract】 Along with the fast development of modern industry, the demand to iron-based composites was increasing, and the preparation was regarded widely. Combustion synthesis, which is a kind of methods of preparing iron-based composites, developed rapidly in recent years. VC is the ideal reinforcement in iron-based composites. By far, reports about the research of combustion synthesis of VC reinforced iron-based composites under an electric field are few.In this paper, the thermal simulation instrument Gleeble-1500D was used in this experiment. When the experiment started, several parameters, which included the preset heating rate, the preset maximal temperature and heat-preservation temperature etc, were set in the instrument. Then according to this parameters, the instrument controlled the heating rate of samples via controlling the current of samples until the combustion synthesis of the system was completed. In this experiment, the effect of the electric field was not only supplying Joule heat to system, but also excitating and maintaining the synthesis reaction, so the ignition was not needed. After completing the experiment of combustion synthesis, the products’phase was analyzed using D/Max-IIIA X-ray diffraction aparatus which made in Japan, and the microstructure and morphology were identified by更多还原