反应火焰喷涂合成TiC-Fe涂层的反应机理

Reaction Mechanism of Preparing TiC-Fe Coatings by Reactive Flame Spray Synthesis

利用差热分析（DTA）、X－射线分析（XRD）等测试手段，研究了反应火焰喷涂过程中喷涂粉末（Fe－Ti－C体系）的反应机理．研究结果表明，在反应火焰喷涂合成TiC-Fe涂层中，喷涂粉末在飞行过程中的反应是逐步进行的．喷涂距离为125～170mm是发生反应的主要区域．在到达工件表面时，反应已基本结束．因此，与传统热喷涂相比，反应火焰喷涂的优势在于，利用廉价原料一步合成、沉积比较昂贵的涂层材料．

The reaction mechanism of Fe-Ti-C system was studied by Deferent Thermal Analysis (DTA),X-Ray Analysis (XRD), Scanning Electron Micrograph (SEM) and other means during the reactive apglomerated spray powder flying when TiC-Fe cermet coatings were obtained by Reactive Flame Spray Synthesis (RFSS). It is revealed tha the reaction of Fe-Ti-C system happened step by step during the reactive spray powder flying, and basically finished when it reached the substrate, TiC-Fe materials were mainly synthsized when the spray distance is 125~170 mm. Therefore, Compared with the theditional oxygen-acetylene flame spray technology ,the advantages of RFSS lied in simultaneous synteesis and deposition of expensive coating materials from an in-situ reaction of cheap raw materials.