Nano-CeO_2对高速火焰喷涂层组织和性能的影响

Effect of nano-CeO_2 on structure and properties of high velocity flame spraying coating

将不同质量分数的Nano-CeO2粉体添加到NiCrFe/WC喷涂材料中,利用CP-3000型高速火焰喷涂设备在Q235低碳钢上制备涂层,利用光学显微镜、扫描电子显微镜、X射线衍射仪等设备对涂层进行显微组织、表面形貌观察及物相分析,利用SHT4605型万能试验机、M-200磨损试验机和HXD-1000TM型显微硬度仪测试涂层的力学性能.结果表明,Nano-CeO2粉体可以细化涂层组织,提高涂层的致密性,在涂层凝固结晶过程中促进组分间的化学冶金反应,形成了一些新相如NiCrFe,γ(Fe,Ni)固溶体和CeNi3,这些新相通过固溶强化等作用提高了涂层的力学性能,使涂层的显微硬度、结合强度以及耐磨性都得到大幅度提高,当Nano-CeO2粉体添加量为1%时涂层的微观组织状态最佳,力学性能最高.

Different amount of nano-CeO2powder was added into NiCrFe / WC for spray. The coating was produced on Q235 substrate by CP-3000 high velocity flame spraying equipment. The microstructure and surface morphology of the coating were analyzed by optical microscopy and scanning electron microscopy. The phase composition of the coating was determined by X-ray diffraction. The wear properties of the coating were investigated by an M-200-wear-tester. The adhesive strength of the coating were investigated on an SHT4605 universal testing machine. The micro-hardness of the coating was evaluated by HXD-1000TM micro-hardness instrument. The results showed that nano-CeO2powder could refine the microstructure of the coating and improve the compactness of the coating,which also promoted the chemical metallurgical reaction among components in the process of solidification and crystallization of the coating. In the process of formation of the coating, some new phases were formed,such as NiCrFe、γ( Fe,Ni) solid solution and CeNi3.These new phases improved the mechanical properties of the coating through solid solution strengthening. The micro-hardness,adhesive strength and wear resistance of the coating were greatly improved. The optimal addition of nano-CeO2powder was1%.