以沥青为前驱体制备TiC/FeCrNi反应火焰喷涂复合涂层

Fabrication of TiC/FeCrNi Composite Coatings by Reactive Flame Spray Using Asphalt as Carbonaceous Precursor

摘要:

以钛铁粉、CrFe粉、羰基镍粉和碳的前驱体（石油沥青）为原料,通过前驱体碳化复合技术制备了Ti-Fe-Cr-Ni-C反应喷涂复合粉末,并通过普通火焰喷涂成功地合成与沉积了TiC/FeCrNi复合涂层.采用XRD和SEM对喷涂粉末和涂层的相组成和显微结构进行了分析,同时对涂层耐磨性能进行了对比研究.研究结果表明：采用前驱体碳化复合技术制备的Ti-Fe-Cr-Ni-C反应喷涂复合粉末粒度均匀、无有害相生成;所制备的TiC/FeCrNi复合涂层由不同含量TiC颗粒分布于金属基体内部而形成的复合强化片层叠加而成,TiC颗粒呈纳米级;基体由（Fe,Cr）和Cr0.19Fe0.7Ni0.11两相组成;相同条件下,所获TiC/FeCrNi复合涂层磨损体积大约是常规火焰喷涂Ni60涂层的1/8.

Abstract:

Ti-Fe-Cr-Ni-C composite coatings were deposited with a new process of Reactive Flame Spray (RFS) from the powders synthesized by the process of precursor-carbonization-composite, in which ferrotitanium and asphalt were used as raw materials. XRD and SEM were employed to analyze the phase composition and microstructure of the composite powders and coatings. The wear resistance of the coating was tested. The results show that the TiC/FeCrNi composite coating by RFS is composed of layers in which the round nanoscale TiC particles are dispersed within a metal matrix. The matrix consists of Cr0.19Fe0.7Ni0.11 and (Fe, Cr). Under the same condition of wear testing, the wear volume of the TiC/FeCrNi composite coating is one eighth of that of the Ni60 coating by normal flame spray.