激光熔覆涂层中TiC_p界面结构与涂层冲击磨损性能

TiC_p Interfacial structure and impact wear resistance of TiC p/Ni coating by laser cladding

研究了外加ＴｉＣｐ／Ｎｉ 合金激光熔覆涂层中ＴｉＣｐ 的界面结构以及涂层的冲击磨损性能，并与原位ＴｉＣｐ／Ｎｉ 涂层进行了对比．结果表明，外加ＴｉＣｐ 界面存在外延生长、界面反应物及析出物．原位及外加ＴｉＣｐ 涂层在低冲击载荷下均可提高冲击磨损性能，前者提高幅度较大；在高冲击载荷下外加ＴｉＣｐ 涂层降低磨损性能，而原位ＴｉＣｐ 涂层仍显著提高磨损性能．ＴｉＣｐ 界面结构特征是影响磨损性能的主要原因．

The TiC p interface and impact wear resistance of TiC p/Ni coating by laser cladding are studied, and compared with in situ reacted TiC p/Ni coating. It is observed that the epitaxial growth, interface reaction and precipitation appear at the TiC p interface. Under lower impact work, coatings with in situ reacted and directly-added TiC p have improved wear resistance. Under higher impact work, the wear resistance of the coating with directly-added TiC p become worse, while the wear resistance with in situ TiC p is still considerably improved. The structure character at TiC p interfaces is the major factor having effect on wear performance.