Ni-based diamond composite coatings: preparation process, microstructure, properties and interfacial behavior

Ni-based coating, a kind of surface material, is characterized by high hardness, outstanding wear resistance, and excellent corrosion resistance. Ni-based coatings doped with hard phases can improve the coating quality. This is an important topic in related fields. Compared with traditional Ni-based coatings, Ni-based coatings doped with a hard phase have stronger competitive advantages. Among these, Ni-based diamond composite coatings have superior performance. Hence, it has become a kind of excellent functional coating. We outline the current state of research on Ni-based diamond composite coatings. Advances in seven preparation processes for Ni-based diamond composite coatings were discussed. These processes mainly include brazing, electrodeposition, sintering, laser cladding, plasma spraying, supersonic laser deposition, and vacuum cladding. The latest studies on the interfacial behavior, microstructure, and bond strength of these composite coatings are also summarized. The deficiencies for present Ni-based diamond composite coatings are pointed out. Meanwhile, the developmental directions of related fields are envisioned. That could provide theoretical guidance and reference information for research and technological development in the near future.