碳含量对反应等离子喷涂TiCN涂层的影响

以廉价Ti粉和碳黑为原始粉末，采用喷涂造粒制备Ti-C团聚复合喷涂材料，并通过反应等离子喷涂在 氮气气氛下合成TiCN涂层. 使用X射线衍射仪（XRD）、扫描电子显微镜（SEM）及显微硬度计对涂层进行表 征，探讨了碳含量（14.3%，16.7%及20%）对TiCN涂层物相组成、显微结构及显微硬度的影响. 结果表明： 所制备的涂层均由TiC0.2N0.8和少量钛的氧化物组成，随着碳含量的增加，钛的氧化物含量降低. 涂层为典型层 状结构，存在少量裂纹及孔洞，当碳含量为20%时，制备的涂层相对致密，缺陷最少. 此外，涂层由细小等轴 晶和柱状晶组成，当碳含量为20%时，制备的涂层平均显微硬度最高，为（1589±98.7） Hv0.2，这是晶粒细化 和显微结构致密的结果.
AnagglomeratedTi-CfeedstockforreactivesprayingpreparedbysprayinggranulationwithcheapTipow? derandblackcarbonasrawpowder.TiCNcoatingswerefabricatedbyreactiveplasmaspraying(RPS)withN2.Theef? fectsofcarboncontent(14.3%,16.7% and20%)onphasecomposition,microstructureandVickersmicrohardnessof coatingswereinvestigatedbyX-raydiffraction(XRD), scanningelectronmicroscope(SEM)andVickersMicrohardness Tester.TheresultsshowedthatallthecoatingsconsistedofTiC0.2N0.8andminortitaniumoxides,andtheamountoftitani? umoxidesdecreasedwiththeincreasingcarboncontent.Allthecoatingspossessedatypicallaminatedstructurewith somedefects(cracksandpores),andarelativelydensemicrostructurewasobtainedwhenthecarboncontentwas20%. Inaddition,theplasmasprayedTiCNcoatingswerecomposedofnumerousfineequiaxedcrystalandcolumnarcrystal. Themicrohardnessofcoatingsprayedwithcarboncontentof20%was(1589±98.7)Hv0.2,whichwasthehighestamong thesethreecoatings.Thiswasattributedtothedensemicrostructureandrefinementofgrainsize.