标题：TiB2 strip+TiC particles multiscale strengthing phase for ceramic composite coatings by plasma cladding
作者：Wang, Ke ;Cui, Hong-Zhi ;Wei, Na ;Zhang, Yan-Feng ;Wang, Shu-Feng ;Cheng, Gui-Qin
作者机构：[Wang, Ke ;Cui, Hong-Zhi ;Wei, Na ;Zhang, Yan-Feng ;Wang, Shu-Feng ] School of Materials Science and Engineering, Shandong University of Science and T 更多
来源：Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
摘要：A kind of Fe-based ceramic coatings with TiB2 strips and TiC particles as multi scale strengthening phases on the surface of Q235 steel were fabricated by plasma cladding using Fe, Ti and B4C powder mixture as precursor. The phase composition, microstructure and microhardness of the coatings were investigated. The microstructure evolution and the formation of the phase were discussed. The results show that the coatings are composed of TiB2, TiC, Fe2B, Fe3(C, B) and α-Fe phases. TiB2 phase is mainly in the shape of strip with length of 60-74 μm, and a small amount phase is in shape of quasi-hexagonal with size of 4-5 μm. Most of the TiC particles are irregular polygon shape with size of 2-3 μm, dispersed in the coating homogenously. Some of the TiC particles are dendrite shape. Furthermore a transition layer between coating and substrate is formed. This is benefit to improve the bonding strengthening between surface coating and substrate to produce a dense and strong metallurgical interface. With the increasing of plasma beam current, the amount of strip-like TiB2 can decrease, but quasi-hexagonal TiB2 increase. At the same time, TiC dendrites develop fully. Thus, the composite coating is reinforced by the multi-scale and coexisting of TiB2 strip and small TiC particles. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.