High temperature erosion of Ti(Mo)C–Ni cermets

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr7C3–Al2O3 composite coating

“…At a temperature above 500°C, the material starts to oxidize and forms stable Al 2 O 3 oxides, which could be the reason for constant erosion rate. These results are consistent with those reported by Irina et al The erosion rate at a higher temperature does not significantly increase due to increase in the plasticity of the material and the formation of the thin oxide layer …”

“…The Ni–Mo–Al coating shows superior properties as compared to other coating material. The molybdenum content in the matrix enhances the hardness, antiscuffing, and erosion resistance at ambient condition but have limited properties at elevated temperatures, that is, in the range of 673‐873 K . At elevated temperatures, the material erosion behavior depends on the rate of oxidation, the thickness of the material, morphology, adherence behavior with the substrate, and toughness of the in‐situ oxide layer …”

Effect of Mo on Microstructures and Wear Properties of In Situ Synthesized Ti(C,N)/Ni-Based Composite Coatings by Laser Cladding

“…In this case, the undissolved TiN will act as the nucleation site for the grain growth, so the grain is refined due to the increased number of crystal nuclei. On the other hand, Mo can improve the wettability between ceramic phases and matrix, and reduce the contact among ceramic phases, thus the aggregation and growth of ceramic phases are effectively restrained [ 21 , 22 ]. The enlarged images ( Figure 3 d,f) show that the microstructure of the 4Mo and 8Mo coatings mainly consists of dark blocky phases (R3 and R5) and deep grey whisker phases (R4 and R6), which is similar to that of the 0Mo coating.…”

“…According to the report of Li et al [ 18 ], the laser-cladded TiC–TiN–TiCN/Al 3 Ti–Ti 3 Al intermetallic coatings showed a significant increase in wear-resistant properties (4.5~5 times) compared with the Ti6Al4V alloys. Furthermore, previous studies indicated that Mo or Mo 2 C played an important role in improving the wettability between TiC or Ti(C,N) and Ni matrix; meanwhile, cermets with Mo or Mo 2 C addition showed a finer microstructure and better mechanical properties [ 19 , 20 , 21 , 22 ]. However, investigations on the influence of Mo on the microstructures and wear properties of the laser-cladded Ti(C,N)/Ni coatings have been rarely involved so far.…”

Effect of Mo2C on erosion–corrosion resistance behavior of Ti(C, N)-based cermets

“…The main failure mechanism of tungsten carbide during slurry erosion is binder removal, followed by WC grain detachment [7,8]. Ti(C, N)-based materials are considered an alternative to tungsten carbide because of their high hardness, chemical inertness, respectable strength and fracture toughness, combined with their relatively low production costs [9]. The erosion of cermets materials first starts locally in the binder phase; further microcracks and fracture appear in exposed carbides after they lose their protective binder [10].…”