Titanium nitride is widely used as a hard, wear-resistant coating for cutting tools, drills, and molds, significantly extending their lifespan. Its high surface hardness and low friction coefficient make it ideal for industrial machining applications. It is also applied in the aerospace and automotive industries to protect engine components and moving parts from wear and corrosion. In electronics, titanium nitride serves as a conductive diffusion barrier in microchips, preventing metal from migrating into silicon layers, which improves device reliability and performance. It is commonly used in semiconductor manufacturing processes. Due to its gold-like appearance, it is used for decorative finishes on watches, jewelry, and architectural fixtures, offering both aesthetic appeal and durability. Additionally, it is used in medical devices such as surgical instruments and implants, where biocompatibility, hardness, and resistance to body fluids are essential.