热喷涂TiC-NiCr涂层的磨损行为及机理  

Wear Behavior and Mechanism of Thermal Sprayed TiC-NiCr Coating

作　　者：国俊丰 夏春阳 GUO Junfeng;XIA Chunyang(BGRIMM Advanced Materials Science & Technology Co.,Ltd.,Beijing 102206,China;Beijing Engineering Technology Research Center of Surface Strengthening and Repairing of Industry Parts,Beijing 102206,China;Beijing Key Laboratory of Special Coating and Technology,Beijing 102206,China)

机构地区：[1]北矿新材科技有限公司,北京102206 [2]北京市工业部件表面强化与修复工程技术研究中心,北京102206 [3]特种涂层材料与技术北京市重点实验室,北京102206

出　　处：《有色金属工程》2021年第10期48-53,共6页Nonferrous Metals Engineering

摘　　要：采用超音速火焰喷涂工艺制备得到了新型TiC-30NiCr涂层,系统地表征分析了涂层的相结构、显微组织和摩擦磨损行为,并与传统的WC-CoCr涂层进行了耐磨损性能的比较。结果表明,热喷涂过程中TiC脱碳转变为了Ti_(8)C_(5)相,绝大部分Cr固溶于Ni相中。在往复摩擦过程中,单质态Cr在摩擦热作用下发生了氧化,同时有少量的氮化硅摩擦副的磨屑嵌入了Ni(Cr)粘结相中。在摩擦应力作用下,层片间疲劳裂纹的扩展、碳化钛和Ni(Cr)相界面的开裂是导致TiC-NiCr涂层发生大块材料剥落的主要原因。虽然与传统WC-CoCr涂层相比,制备的TiC-NiCr涂层的硬度和耐磨性均较低,但其在要求成本低、对环境友好、同时具有较好耐磨性的工况环境中将具有重要的应用前景。The new TiC-30NiCr coating is prepared via supersonic flame spraying process.The phase structure,microstructure and frictional wear behavior of the coating are systematically characterized,and the wear resistance performance of this coating is compared with the traditional WC-CoCr coating.The results show that during thermal spraying,TiC decarbonization was converted into Ti_(8)C_(5) phase,and the vast majority of Cr solidified in Ni phase.During reciprocating friction and with the conditions of frictional heat,monomorphic Cr oxidizes and a small amount of silicon nitride frictional sub-friction chips are embedded in the Ni(Cr)bonding phase.Under friction stress,the expansion of fatigue cracks between layers,titanium carbide and Ni(Cr)phase interface cracking are the main reasons of large areas peeling of TiC-NiCr coating.Although the TiC-NiCr coating is less hard and wear resistant than conventional WC-CoCr coating,it may have promising application prospects in special environments which the costs are low,the environment is friendly,and the wear resistance is excellent.

关 键 词：碳化钛 碳化钨 金属陶瓷涂层 界面开裂 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]