Strengthening design for nano-composite cutting tool coatings

With the increasing application of efficient cutting and difficult-to-machine materials, the conflict between hardness and toughness in traditional cutting tool coatings has become more pronounced. The unique microstructure design of nano-composite coatings provides an effective way to break through this bottleneck. This paper summarizes the research progress in the strengthening design of nano-composite cutting tool coatings [1-3]. The article elucidates the definition and classic structural models of nano-composite coatings, systematically analyzes their strengthening and toughening mechanisms, reviews the design ideas of different material systems, discusses the impact of preparation processes on microstructure and performance, and introduces evaluation methods for mechanical properties and cutting performance. Finally, the article points out the challenges faced in current research and prospects future development trends